JPH04141284A - Treatment of ash collected by dust collector - Google Patents
Treatment of ash collected by dust collectorInfo
- Publication number
- JPH04141284A JPH04141284A JP2263813A JP26381390A JPH04141284A JP H04141284 A JPH04141284 A JP H04141284A JP 2263813 A JP2263813 A JP 2263813A JP 26381390 A JP26381390 A JP 26381390A JP H04141284 A JPH04141284 A JP H04141284A
- Authority
- JP
- Japan
- Prior art keywords
- collected
- ashes
- high temp
- exhaust gas
- dissolved
- 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
- 239000000428 dust Substances 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 12
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 12
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000002378 acidificating effect Effects 0.000 claims abstract description 5
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 20
- 239000011575 calcium Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000007790 solid phase Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 10
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 7
- 239000001110 calcium chloride Substances 0.000 abstract description 7
- 235000011148 calcium chloride Nutrition 0.000 abstract description 7
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 7
- 239000002002 slurry Substances 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 abstract description 5
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 abstract 4
- 239000002956 ash Substances 0.000 abstract 4
- 238000004090 dissolution Methods 0.000 abstract 2
- 239000000706 filtrate Substances 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000004056 waste incineration Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は燃焼排ガスを消石灰で処理する際に捕集される
集塵捕集灰の処理方法に関し、特に、都市ごろの他、塩
化ビニル等焼却によってＨＣＩガスが発生するプラスチ
ック類等を含む廃棄物の焼却処理設備からの排ガスに有
利に適用できる方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for treating ash collected when combustion exhaust gas is treated with slaked lime. The present invention relates to a method that can be advantageously applied to exhaust gas from waste incineration processing equipment that generates HCI gas when incinerated, including plastics and the like.
消石灰等のアルカリ剤を使用する乾式、半乾式排ガス処
理設備ではｔｌｃｌ、 ＳＯＸと反応したアルカリ剤は
ダストとともに電気集塵器、バグフィルタ等で捕集され
、これらダストは現状では単純な加湿処理もしくはセメ
ント等の固化処理によって処分されているのが一般的で
ある。In dry and semi-dry exhaust gas treatment equipment that uses alkaline agents such as slaked lime, the alkaline agents that have reacted with TICL and SOX are collected together with dust using electrostatic precipitators, bag filters, etc. Currently, these dusts cannot be removed by simple humidification treatment or Generally, it is disposed of through solidification treatment such as cement.
乾式もしくは半乾式の排ガス処理から発生する捕集灰は
、セメント等によって重金属の安定化を行うことは可能
であるが、ＨＣＩとＣａ （０）１）−との反応物であ
るＣａＣＬは水に対する溶解度が高いため、セメントに
よる固化処理を行ったとしても、捕集灰中に３０〜４０
％含まれるＣａＣ１ｚのうち５０％程度は固化物から溶
出し、最終処分地にふけるＣａＣｌ２の溶出は集水管の
閉塞、あるいは下流水域への塩による作物障害などの問
題をひき起す場合がある。It is possible to stabilize heavy metals in the collected ash generated from dry or semi-dry exhaust gas treatment with cement, etc., but CaCL, which is a reaction product of HCI and Ca (0) 1)-, is resistant to water. Due to its high solubility, even if solidified with cement, the collected ash contains 30 to 40
Approximately 50% of the CaC1z contained in the waste is eluted from the solidified material, and the elution of CaCl2 at the final disposal site may cause problems such as clogging of water collection pipes or damage to crops due to salt entering downstream waters.
一方、ＨＣＩ、 ＳＯｘの吸収剤として使用されるＣａ
（ＯＨ） ２についてみても反応率は前述したとおり
３０〜４０％であり、投入される消石灰の約半分がその
まま廃棄物として最終処分されている状況にある。On the other hand, Ca used as an absorbent for HCI and SOx
Regarding (OH) 2, the reaction rate is 30 to 40% as mentioned above, and about half of the slaked lime that is input is ultimately disposed of as waste.
本発明はこのように、最終処分場にて種々の問題を引起
す（：ａＣｌｚと、有効に使用されることなく約５０％
そのまま処分されているＣａ （ＯＨ＞ ２とを含む捕
集灰からこれら２つの成分を分離し、それぞれを合目的
に利用しつる方法を提供しようとするものである。The present invention thus causes various problems at the final disposal site (:aClz and about 50% of the waste is not effectively used).
The present invention aims to provide a method for separating these two components from collected ash containing Ca(OH>2) which is disposed of as is, and utilizing each for their respective purposes.
本発明は消石灰を排ガス中のＩＩｃＩ、 ＳＯＫなどの
酸性ガスの中和処理剤として使用して都市ごみ等の廃棄
物を焼却するに際し、酸性ガスと反応後のカルシウム塩
および未反応のＣａ （ｆ］Ｈ） ２を含む集塵装置捕
集灰を高温水に溶解し、温度の上昇によりＣａ （ＯＨ
） ＝の溶解度が下ることを利用してＣａＣｌ２を主成
分とする固相とＣａ （ＯＨ） ２を主成分とする液相
とに固液分離することを特徴とする集塵装置捕集灰の処
理方法である。The present invention uses slaked lime as a neutralizing agent for acidic gases such as IIcI and SOK in exhaust gas when incinerating waste such as municipal waste, and uses calcium salts after reaction with acidic gas and unreacted Ca (f ] H) The dust collector collected ash containing 2 is dissolved in high temperature water, and as the temperature rises, Ca (OH
) is characterized by solid-liquid separation into a solid phase mainly composed of CaCl2 and a liquid phase mainly composed of Ca(OH)2. This is a processing method.
捕集灰中に含まれるＣａＣｌ２とＣａ （ＯＨ） ２は
下表に示すように水に対する溶解度が前者は温度が高い
ほど溶解度が上り、後者は温度が高いほど溶解度が下る
特性がある。したがって極力高温の水で捕集灰を溶解す
れば液側にＣａＣｌ２を移行させＣａ （ＯＨ） ＝に
ついては大半を固形物のままとするこきが可能であり、
溶解液をデカンタ、フィルタプレス、スクリュープレス
等の公知の脱水手段によって固液分離すれば効率よ＜
ＣａＣｌ２を主体とする脱離液とＣａ （ＯＨ） ２を
主体とする脱水ケーキとに分離可能である。As shown in the table below, CaCl2 and Ca(OH)2 contained in the collected ash have a characteristic that the solubility of the former increases as the temperature increases, and the solubility of the latter decreases as the temperature increases. Therefore, by dissolving the collected ash with extremely high temperature water, it is possible to transfer CaCl2 to the liquid side and leave most of Ca (OH) = as a solid.
Efficiency can be achieved by separating the dissolved liquid into solid and liquid using known dehydration means such as a decanter, filter press, or screw press.
It can be separated into a dehydrated liquid mainly composed of CaCl2 and a dehydrated cake mainly composed of Ca(OH)2.
一方、ごみ焼却プラントにおいては余熱利用設備として
廃熱ボイラが設置される例も多く、このような場合には
ボイラの連続ブロー排水等の高温排水が排出され、この
ような高温排水を溶解水として使用することによって、
より合理的なプロセスとすることが可能である。またこ
れらの高温排水が発生しないガス冷却室タイプの焼却プ
ラントについても余熱利用設備において８５〜９０℃の
温水を得ることは可能であり、本発明の高温水として適
用することが可能である。On the other hand, waste heat boilers are often installed in waste incineration plants as residual heat utilization equipment, and in such cases, high-temperature wastewater such as continuous blow water from the boiler is discharged, and such high-temperature wastewater is used as dissolved water. By using
It is possible to make the process more rational. Furthermore, it is possible to obtain hot water of 85 to 90° C. in residual heat utilization equipment even in gas cooling chamber type incineration plants that do not generate high-temperature wastewater, and it is possible to use the hot water as the high-temperature water of the present invention.
各温度におけるＣａＣ１ｚ、 Ｃａ （ＯＨ） ２．
Ｃａ５Ｏｎの溶解度は下記の通りである。（数値は各温
度において１００ｇの飽和溶液中に溶存する各物質の量
をｇで示す。）
以下、本発明の具体例を実施例としてあげ、更に本発明
の詳細な説明する。CaC1z at each temperature, Ca (OH) 2.
The solubility of Ca5On is as follows. (The numerical values indicate the amount of each substance dissolved in 100 g of saturated solution at each temperature in g.) Hereinafter, specific examples of the present invention will be given as examples, and the present invention will be further explained in detail.
〔実施例１〕
本発明を適用したごみ焼却炉の一例を第１図によって説
明する。[Example 1] An example of a garbage incinerator to which the present invention is applied will be explained with reference to FIG.
第１図は廃熱ボイラと半乾式排ガス処理の場合のフロー
を示すものであり、ごみは焼却炉１で燃焼し、廃熱ボイ
ラ２にて排ガスの冷却が行われる。次に半乾式排ガス処
理設備３にてＣａ （ＯＨ） ２スラリーが噴霧され、
Ｃａ （ＯＨ） ２は排ガス中のＨＣＩ、 ＳＯＸと反
応し、捕集灰として集塵装置４で捕集される。捕集灰は
溶解装置５においてボイラ２から発生した高温のブロー
排水、もしくは蒸気にて加熱された高温水によって溶解
され、捕集灰中のＣａＣ１ｚは高温水側へ溶出する。FIG. 1 shows the flow in the case of a waste heat boiler and semi-dry exhaust gas treatment. Garbage is burned in an incinerator 1, and the exhaust gas is cooled in a waste heat boiler 2. Next, Ca (OH) 2 slurry is sprayed in the semi-dry exhaust gas treatment equipment 3.
Ca (OH) 2 reacts with HCI and SOX in the exhaust gas, and is collected in the dust collector 4 as collected ash. The collected ash is dissolved in the melting device 5 by high-temperature blow drainage generated from the boiler 2 or high-temperature water heated by steam, and CaC1z in the collected ash is eluted to the high-temperature water side.
溶解装置５を出たスラリーは固液分離装置６で脱離液と
ケーキとに分離され、ケーキ分の大半はスラリー化装置
８へ返送されて再利用される。The slurry exiting the dissolving device 5 is separated into a desorbed liquid and a cake in a solid-liquid separator 6, and most of the cake is returned to the slurry forming device 8 and reused.
また、ＳＯｘと反応して生成するＣａ５Ｄｎの量に見合
う部分については場外に搬出され最終処分地にて埋立に
使用される固液分離装置６で分離されたＣａＣＩｚを主
体とする脱離液は排水処理設備７で重金属処理が行われ
た後、下水道に放流される。In addition, the portion corresponding to the amount of Ca5Dn generated by reacting with SOx is transported off-site and used for landfill at the final disposal site.The desorbed liquid, which is mainly composed of CaCIz, is discharged as wastewater. After being treated with heavy metals in the treatment facility 7, it is discharged into the sewer.
〔実施例２〕
第２図に示す例はガス冷却室１０、空気予熱器１１、乾
式排ガス処理設備１２及び温水発生器１３を有する系の
場合である。[Embodiment 2] The example shown in FIG. 2 is a system including a gas cooling chamber 10, an air preheater 11, a dry exhaust gas treatment facility 12, and a hot water generator 13.
この場合、高温溶解水は空気予熱器１１の高温空気から
温水発生装置１３で熱交換して得られる温水が使用され
、固形物（Ｃａ （ＯＨ） 、、 Ｃａ５Ｏ４）は最終
処分地で埋立処分が行われる。In this case, the hot water obtained by exchanging heat from the high-temperature air of the air preheater 11 with the hot water generator 13 is used as the high-temperature dissolved water, and the solids (Ca(OH), Ca5O4) are disposed of in a landfill at the final disposal site. It will be done.
本発明を適用することにより乾式、半乾式排ガス処理設
備を適用する都市ごみ等焼却施設において下記の効果が
生ずる。By applying the present invention, the following effects are produced in municipal waste incineration facilities that apply dry or semi-dry exhaust gas treatment equipment.
■ 最終処分地における塩分溶出量の削減■ 半乾式プ
ロセス採用時においては、排ガス処理用消石灰量の削減
■ 最終処分される捕集灰量の低減による埋立地の延命
化
■ 最終処分地にて溶出する重金属量の削減■ Reducing the amount of salt eluted at the final disposal site ■ Reducing the amount of slaked lime for exhaust gas treatment when using a semi-dry process ■ Extending the life of the landfill by reducing the amount of collected ash that is ultimately disposed of ■ Elution at the final disposal site Reducing the amount of heavy metals
第１図は本発明の第１実施例の説明図、第２図は本発明
の第２実施例の説明図である。FIG. 1 is an explanatory diagram of a first embodiment of the present invention, and FIG. 2 is an explanatory diagram of a second embodiment of the present invention.
Claims (1)
中和処理剤として使用して都市ごみ等の廃棄物を焼却す
るに際し、酸性ガスと反応後のカルシウム塩および未反
応のＣａ（ＯＨ）＿２を含む集塵装置捕集灰を高温水に
溶解し、温度の上昇によりＣａ（ＯＨ）＿２の溶解度が
下ることを利用してＣａＣｌ＿２を主成分とする固相と
Ｃａ（ＯＨ）＿２を主成分とする液相とに固液分離する
ことを特徴とする集塵装置捕集灰の処理方法。When slaked lime is used as a neutralizing agent for acidic gases such as HCl and SOx in exhaust gas to incinerate waste such as municipal waste, calcium salts and unreacted Ca(OH)_2 after reacting with the acidic gas are The ash collected by the dust collector is dissolved in high-temperature water, and by utilizing the fact that the solubility of Ca(OH)_2 decreases as the temperature rises, a solid phase containing CaCl_2 as the main component and a solid phase containing Ca(OH)_2 as the main component are dissolved. A method for processing ash collected by a dust collector, characterized by separating the ash into a liquid phase and a solid-liquid phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263813A JPH04141284A (en) | 1990-10-03 | 1990-10-03 | Treatment of ash collected by dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263813A JPH04141284A (en) | 1990-10-03 | 1990-10-03 | Treatment of ash collected by dust collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04141284A true JPH04141284A (en) | 1992-05-14 |
Family
ID=17394600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263813A Pending JPH04141284A (en) | 1990-10-03 | 1990-10-03 | Treatment of ash collected by dust collector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04141284A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0568851A (en) * | 1991-09-13 | 1993-03-23 | Kubota Corp | Method and equipment for removing hydrogen chloride |
| CN103071352A (en) * | 2012-04-09 | 2013-05-01 | 邵波 | Dust removing and waste gas removing apparatus |
| CN114011217A (en) * | 2021-11-10 | 2022-02-08 | 山东鲁碧建材有限公司 | Wet flue gas desulfurization method |
-
1990
- 1990-10-03 JP JP2263813A patent/JPH04141284A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0568851A (en) * | 1991-09-13 | 1993-03-23 | Kubota Corp | Method and equipment for removing hydrogen chloride |
| CN103071352A (en) * | 2012-04-09 | 2013-05-01 | 邵波 | Dust removing and waste gas removing apparatus |
| CN114011217A (en) * | 2021-11-10 | 2022-02-08 | 山东鲁碧建材有限公司 | Wet flue gas desulfurization method |
| CN114011217B (en) * | 2021-11-10 | 2024-04-23 | 山东鲁碧建材有限公司 | Wet flue gas desulfurization method |
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