JP4159999B2 - Cooling method of high temperature waste water in waste combustion - Google Patents
Cooling method of high temperature waste water in waste combustion Download PDFInfo
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- JP4159999B2 JP4159999B2 JP2004035723A JP2004035723A JP4159999B2 JP 4159999 B2 JP4159999 B2 JP 4159999B2 JP 2004035723 A JP2004035723 A JP 2004035723A JP 2004035723 A JP2004035723 A JP 2004035723A JP 4159999 B2 JP4159999 B2 JP 4159999B2
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- 238000001816 cooling Methods 0.000 title claims description 97
- 238000002485 combustion reaction Methods 0.000 title claims description 51
- 239000002351 wastewater Substances 0.000 title claims description 34
- 239000002699 waste material Substances 0.000 title claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 6
- 238000009841 combustion method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 37
- 239000007788 liquid Substances 0.000 description 14
- 238000012856 packing Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- -1 sodium chloride Chemical compound 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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Description
本発明は、各種産業の工場等から発生する廃液、廃ガス等の廃棄物を焼却処理した際に、廃棄物の燃焼により生ずる高温の燃焼排ガスを水と直接に接触させて冷却する方式において、排ガスの冷却によって生ずる高温となった水を排出する場合に、効率的に冷却する方法に関するものである。 The present invention is a method in which when waste such as waste liquid and waste gas generated from factories in various industries is incinerated, the high-temperature combustion exhaust gas generated by combustion of the waste is brought into direct contact with water and cooled. The present invention relates to a method of efficiently cooling water when discharging high temperature water generated by cooling of exhaust gas.
各種産業の工場等から発生する廃液、廃ガス等の廃棄物を焼却処理する焼却炉からの燃焼排ガスを冷却する方法としては、高温の燃焼排ガスを水と直接に接触させて冷却する方式が多用されている。このような冷却する方法のひとつとして、例えば高温の燃焼排ガスを直接水中に噴射させることにより燃焼排ガスの冷却を行う液中燃焼方式が、効率よくガス冷却を行うことができる方法として知られている（例えば、非特許文献１参照。）。
このような冷却方法の場合には、燃焼排ガスと接触し排ガスを冷却させた水は、８５℃以上の高温となり、冷却缶等の容器に集められている。前記冷却缶等の水を排水として、一般的な方法により河川や海等に放流する場合には、放流基準を満たすために、懸濁物質の除去や薬剤処理等の後処理が必要となってくる。この後処理は、操作温度に制約がある場合が普通である。例えば、排水中の懸濁物質を除去することを考えた場合、フィルタープレスといったろ過器を用いることが多く、その場合フィルタープレスにおける通液部の材質として安価な樹脂材質を選定する場合には、操作温度の上限は７０℃程度となることが多い。また、地域においては放流基準として温度の上限が定められている場合もあるし、放流基準が定められていない場合にも、通常は４０℃以下にすることが求められている。このような制約により冷却缶等からの排水を高温状態のままに排出することは難しく、多くの場合には冷却することが必要である。 In the case of such a cooling method, the water which has contacted the combustion exhaust gas and cooled the exhaust gas has a high temperature of 85 ° C. or higher and is collected in a container such as a cooling can. When water from the cooling can etc. is discharged into a river or the sea by a general method, post-treatment such as removal of suspended solids or chemical treatment is required to satisfy the discharge standard. come. In this post-processing, the operating temperature is usually limited. For example, when considering the removal of suspended solids in wastewater, a filter such as a filter press is often used, and in that case, when selecting an inexpensive resin material as the material of the liquid passing part in the filter press, The upper limit of the operating temperature is often about 70 ° C. In some areas, the upper limit of the temperature may be set as the discharge standard, and even when the discharge standard is not set, it is usually required to be 40 ° C. or lower. Due to such restrictions, it is difficult to discharge waste water from a cooling can or the like in a high temperature state, and in many cases, cooling is necessary.
これまで上記のような液中燃焼における冷却缶等の排水を冷却する方法としては、プレート式熱交換器やシェルアンドチューブ式熱交換器等の熱交換器を使い、冷却水を用いて間接的な冷却を行ってきた。しかし、冷却缶等の排水中には、通常焼却処理の対象となる廃棄物の廃液中や、焼却装置への給水中に含まれるカルシウム塩、マグネシウム塩といった硬度成分が含まれており、それらが熱交換器の伝熱面に付着することで伝熱面の汚れとなり、熱交換器の熱交換能力を著しく低下させる。この現象は、特に廃棄物の焼却処理により発生する亜硫酸ガスや塩化水素ガス等の酸性ガス成分を排気ガス中に出ないようにするために、冷却缶内の冷却水をアルカリ性で操作することが多く、このことが硬度成分の水への溶解度を著しく低下させ、伝熱面への付着がより起き易い状況を招いている。汚れの付着により性能が低下した熱交換器は、間欠的に洗浄を行って性能回復を図らなければならないだけでなく、洗浄の頻度が頻繁であるため、これがこの種装置の運転において多大な作業負荷となっていた。 Conventionally, as a method of cooling the drainage of cooling cans and the like in submerged combustion as described above, a heat exchanger such as a plate heat exchanger or a shell and tube heat exchanger is used and indirectly using cooling water. Cooling has been performed. However, wastewater such as cooling cans contains hardness components such as calcium salts and magnesium salts contained in waste liquids that are normally subject to incineration and in water supplied to incinerators. By adhering to the heat transfer surface of the heat exchanger, the heat transfer surface becomes dirty, and the heat exchange capability of the heat exchanger is significantly reduced. This phenomenon is caused by the fact that the cooling water in the cooling can is operated with alkalinity so that acidic gas components such as sulfurous acid gas and hydrogen chloride gas generated by incineration of waste are not emitted into the exhaust gas. In many cases, this significantly reduces the solubility of the hardness component in water, and leads to a situation where adhesion to the heat transfer surface is more likely to occur. A heat exchanger whose performance has deteriorated due to the adhesion of dirt not only has to be cleaned intermittently to restore performance, but also because of the frequent frequency of cleaning, this is a significant task in the operation of this type of equipment. It was a load.
本発明は、上記課題を解決し、廃棄物の燃焼により生ずる高温の燃焼排ガスを水と直接に接触させて冷却させた場合に、排ガスの冷却によって生ずる高温となった水を冷却缶等から排水として排出し、これを冷却する際に、排水中に含まれる硬度成分に関わりなく、洗浄等の装置運転に関わる作業負荷を軽減し、効率的に安定して高温排水の冷却操作を行うことができる冷却方法を提案するものである。 The present invention solves the above-mentioned problem, and when the high-temperature combustion exhaust gas generated by combustion of waste is cooled by direct contact with water, the high-temperature water generated by cooling the exhaust gas is discharged from a cooling can or the like. When cooling this, it is possible to reduce the work load related to equipment operation such as cleaning, regardless of the hardness component contained in the wastewater, and to efficiently and stably cool the high-temperature wastewater. A cooling method that can be used is proposed.
本発明は、廃棄物焼却炉より発生する燃焼排ガスを水と直接に接触させることにより燃焼排ガスの冷却を行う方式により生ずる高温排水を冷却するに際し、冷却塔の上部より前記高温排水を流下させ、塔の下部から供給する空気と向流接触させるとともに、冷却塔から排出される空気は、前記廃棄物焼却炉に具備されている排ガスの除塵装置へ供給して処理することを特徴とする廃棄物燃焼における高温排水の冷却方法である。 The present invention, when cooling the high temperature wastewater generated by the method of cooling the combustion exhaust gas by directly contacting the combustion exhaust gas generated from the waste incinerator with the water, flowing down the high temperature waste water from the top of the cooling tower, Waste that makes countercurrent contact with the air supplied from the lower part of the tower, and that the air discharged from the cooling tower is supplied to the exhaust gas dust removing device provided in the waste incinerator for processing . This is a method of cooling high temperature waste water in combustion.
上記の廃棄物焼却炉より発生する燃焼排ガスを水と直接に接触させる燃焼排ガスの冷却方式としては、水中に燃焼排ガスを噴射させる液中燃焼方式、または燃焼排ガスに水を噴霧供給するスプレー冷却方式のいずれかが望ましい。 Combustion exhaust gas cooling system that directly contacts the combustion exhaust gas generated from the above waste incinerator with water is a submerged combustion system that injects combustion exhaust gas into water, or a spray cooling system that sprays water to combustion exhaust gas Either is desirable.
前記の冷却塔としては、高温排水と空気との気液接触を良好にするために、充填塔、泡鐘塔、棚段塔、濡れ壁塔のいずれかの方式を用いることが好ましい。これらの中でも、高温排水と空気との気液接触を効率的に行え、設備的にも比較的安くなる塔内に充填物を内装した充填塔の利用が望ましい。尚、充填物等の設置されていない空塔状態の冷却塔内へ高温排水を噴霧して微粒子として、塔の下部から供給された空気と接触させることは、排空気へ同伴する無機塩類等の微粒子が増加し、後段の集塵装置の負荷を高める可能性があるので避けた方がよい。 As the cooling tower, it is preferable to use any one of a packed tower, a bubble bell tower, a plate tower, and a wet wall tower in order to improve the gas-liquid contact between the high temperature waste water and the air. Among these, it is desirable to use a packed tower in which a packing is housed in a tower that can efficiently perform gas-liquid contact between high-temperature wastewater and air and is relatively inexpensive in terms of equipment. In addition, spraying high-temperature wastewater into an empty cooling tower in which no packing or the like is installed and bringing it into contact with the air supplied from the lower part of the tower as fine particles, such as inorganic salts accompanying the exhaust air, etc. It is better to avoid fine particles because it may increase the load on the dust collector at the later stage.
さらには、冷却塔の下部に供給する空気を、廃棄物焼却炉に具備されている燃焼空気ブロワーから分岐させて供給することが望ましい方法である。 Furthermore, it is desirable that the air supplied to the lower part of the cooling tower is branched from the combustion air blower provided in the waste incinerator.
本発明では、廃棄物焼却炉より発生する燃焼排ガスの冷却を水との直接接触で行い、その後排ガスを冷却させ水は冷却缶等に集められ、そこから排出される高温排水を冷却するに際し、従来のように熱交換器を用いることなく、冷却塔内で高温排水と空気とを気液接触させることで効率的に冷却できるようにした。さらにこの方法であると、汚れを生じる伝熱面が存在しないために、従来問題となった伝熱面の汚れによる性能低下の懸念がなくなり、長期間にわたる安定した運転が可能となる。 In the present invention, the combustion exhaust gas generated from the waste incinerator is cooled by direct contact with water, and then the exhaust gas is cooled and the water is collected in a cooling can etc., when cooling the high temperature waste water discharged from it, Without using a heat exchanger as in the past, high-temperature wastewater and air are brought into gas-liquid contact in a cooling tower so that cooling can be efficiently performed. Furthermore, with this method, since there is no heat transfer surface that causes dirt, there is no concern about performance degradation due to dirt on the heat transfer surface, which has been a problem in the past, and stable operation over a long period of time becomes possible.
以下の説明では、前記の非特許文献１に記載されているような液中燃焼方式を主として行うが、この他にスプレー冷却方式の他、廃棄物焼却炉より発生する燃焼排ガスを水と直接に接触させることにより、燃焼排ガスを急速に冷却することで生ずる高温排水を冷却する場合に本発明の冷却方法は適用できる。 In the following description, the submerged combustion method as described in Non-Patent
すなわち、液中燃焼方式では、廃液、廃ガス等の廃棄物を焼却炉で焼却処理し、発生する高温の燃焼排ガスを焼却炉に連通して設置されている冷却缶内の水中へ直接に噴射させることで、極く短時間に燃焼排ガスを冷却する方法であり、前記の冷却缶内において高温となっている排水を外部へ導き後処理を施すために、後処理に適した温度に冷却するために本発明を適用する。 In other words, in the submerged combustion method, waste such as waste liquid and waste gas is incinerated in an incinerator, and the generated high-temperature combustion exhaust gas is directly injected into the water in a cooling can installed in the incinerator. This is a method for cooling the combustion exhaust gas in a very short time, and in order to introduce the waste water that is at a high temperature in the cooling can to the outside and to perform post-treatment, it is cooled to a temperature suitable for post-treatment. Therefore, the present invention is applied.
また、焼却炉からの高温の燃焼排ガスを、焼却炉に連通する流路内に水を噴霧して冷却し、冷却に用いた水を貯槽等に入れ、循環利用するスプレー冷却方式においても、高温となった排水を冷却するために本発明は適用できる。
同様に、焼却炉で発生した高温の燃焼排ガスを水と直接に接触させることによって、生ずる高温排水を冷却するために、本発明の冷却方法は有用である。In addition, the high temperature combustion exhaust gas from the incinerator is cooled by spraying water into the flow path communicating with the incinerator, and the water used for cooling is placed in a storage tank or the like, and the spray cooling system that circulates and uses the high temperature is also used. The present invention can be applied to cool the drainage.
Similarly, the cooling method of the present invention is useful for cooling the high temperature waste water generated by bringing the high temperature combustion exhaust gas generated in the incinerator directly into contact with water.
温度が高くなった水を冷却するために、水と空気を向流で直接接触させ、その際に起きる水の気化により、温水より気化熱として熱を奪う冷却方法が、冷水塔等で広く利用されているが、この場合には基本的にスケールの発生を防ぐために薬剤添加を行っていたり、水質管理を行っているのが一般的であるため、スケールの発生による問題が生ずることがないうえに、一般的に温度範囲も本発明のような高温ではなく、より低い温度範囲で利用されている。具体的には、４０℃の温水の温度を３０℃程度に低下させている程度である。
また、冷却対象が不純物を含有する排水である場合には、通常の冷水塔のように排空気をそのまま大気へ放出する大気開放型とすると、気液接触により排空気へ同伴される排水の飛沫に含まれる不純物の無機塩類が微粒子となってしまい、二次公害を招くおそれがあり、そのまま適用することは困難である。
このため、本発明の場合には、冷却缶等より排出される高温排水と空気との気液接触を、大気開放とせずに、冷却塔の内部で行わせるようにした。また、冷却塔から排出される空気は、通常焼却装置に具備されている排ガスの除塵装置へ供給して処理することができるため、新たに除塵装置を設けることなく本発明を適用できる。In order to cool water whose temperature has been increased, a cooling method in which water and air are brought into direct contact with each other in a countercurrent and the heat generated from the vaporization of the water is removed as heat of vaporization from hot water. In this case, however, chemicals are generally added to prevent the occurrence of scale and water quality control is generally performed, so there is no problem due to the occurrence of scale. In general, the temperature range is not a high temperature as in the present invention, but is used in a lower temperature range. Specifically, the temperature of the hot water at 40 ° C. is lowered to about 30 ° C.
In addition, when the object to be cooled is wastewater containing impurities, if it is an open air type that discharges exhausted air to the atmosphere as is the case with ordinary cold water towers, the splash of wastewater accompanying the exhausted air by gas-liquid contact The inorganic salt of impurities contained in the powder becomes fine particles, which may cause secondary pollution, and it is difficult to apply as it is.
For this reason, in the case of this invention, the gas-liquid contact with the high temperature waste_water | drain discharged | emitted from a cooling can etc. and air was made to perform in the inside of a cooling tower, without releasing air | atmosphere. Further, since the air discharged from the cooling tower can be supplied and processed to the exhaust gas dust remover normally provided in the incinerator, the present invention can be applied without newly providing a dust remover.
さらに冷却塔において冷却源となる空気は、焼却装置にて廃液、排ガス等の廃棄物を燃焼させるために必要な燃焼空気を焼却炉へ送風する燃焼空気ブロワーより、この供給路から適宜分岐させて供給することによって、新たな送風機を設置することなく冷却のための空気を確保でき、より経済的に装置を構成することができる。 Furthermore, the air that serves as a cooling source in the cooling tower is appropriately branched from this supply path from a combustion air blower that blows combustion air necessary for burning waste liquid, exhaust gas and other waste to the incinerator in the incinerator. By supplying, air for cooling can be secured without installing a new blower, and the apparatus can be configured more economically.
次に、本発明の内容を、図面を基に説明する。図１は、本発明を実施するための液中燃焼方式なよる冷却缶排水の冷却装置の一例で、その概略図である。冷却缶から排出される高温の排水３は、充填物を内装した充填塔形式の冷却塔１の上部へ供給される。一方の冷却用空気４は、燃焼空気ブロワー２より送風され、冷却塔１の下部より供給される。冷却塔１に供給された冷却缶排水３と冷却空気４は塔内の充填物層にて向流接触し、水分が蒸発することで排水は気化熱を奪われて冷却し、一方空気は排水の熱を奪って加温される。冷却された排水６は、冷却塔１の底部より排出され、排水の後処理工程へ供給される。一方、加温された空気７は冷却塔の塔頂部より排出され、焼却装置の排ガス除塵装置９へ送風される。
冷却用空気４の風量は、冷却塔から排出される冷却処理済の排水６が所定の温度になるに必要な風量とすればよい。図１の冷却塔に内装する充填物は、装置を小型化するためには気液接触効率がよいものを使うことが望ましい。ただし、あまり気液通過部が密なる充填物を使用すると、排水中に含まれる硬度成分等による閉塞が起き、操作性がかえって低下する場合があるので、多少気液接触効率を犠牲にしても充填密度の粗い、不規則充填物を使用するのが望ましい。Next, the contents of the present invention will be described with reference to the drawings. FIG. 1 is an example of a cooling device for cooling can drainage by a submerged combustion system for carrying out the present invention, and is a schematic diagram thereof. The high-temperature waste water 3 discharged from the cooling can is supplied to the upper part of the
The air volume of the cooling air 4 may be an air volume necessary for the cooled
液中燃焼方式による廃液焼却装置の図示していない冷却缶より排出された温度９０℃の排水１０００ｋｇ／ｈｒを、図１に示した充填塔式の冷却塔１の上部へ供給し、３０℃の冷却空気１１０Ｎｍ３／ｈｒを冷却塔１の下部より供給して、冷却を行った。この結果、冷却された排水の温度は４０℃となり効率的な冷却を行うことができた。尚、図１に示したように冷却用空気４は、燃焼空気ブロワー２より燃焼空気を供給する配管より分岐して送風され、冷却塔１の下部へ供給した。
図１に示した方法により、伝熱面の汚れがなくなり、保守管理が容易となって、長期間にわたる安定した運転が可能であった。1000 kg / hr of waste water at a temperature of 90 ° C. discharged from a cooling can (not shown) of a waste liquid incinerator using a submerged combustion system is supplied to the upper part of the packed tower
The method shown in FIG. 1 eliminates contamination of the heat transfer surface, facilitates maintenance management, and enables stable operation over a long period of time.
本発明により、これまでの熱交換器を用いた冷却のような頻繁な洗浄の必要もなく、安定した冷却缶等の排水の冷却操作を行うことができるようになる。また、これまでの間接冷却方式で必要だった冷却水も不要となり、用役費も低減できる。さらに、排水中に例えば塩化ナトリウムのように設備を構成している鉄を腐食させる無機塩が含まれる場合には、熱交換器の材質としてニッケル合金やチタン材等の高価な材質を使用する必要があったが、本発明では安価な樹脂材料が適用可能であり、設備費としても安価になる。
一方これまでの熱交換器による間接冷却方式では、使用しなかった冷却用の空気が必要であるが、これはもともと焼却装置に具備されている燃焼空気ブロワーから供給が可能であり、且つその必要量は、焼却炉の必要燃焼空気量に比して約４％程度と極くわずかであるために、大きな負担になるものではない。また、新しく冷却塔から排出される空気が発生し、これが焼却装置の排ガス集塵装置の負荷となることが予想されるが、これも排出される空気量が焼却装置から発生する燃焼排ガス量の約４％程度と少ないため、集塵装置の負荷上昇としては非常に軽微なものである。
しかも、冷却塔から排出される空気は、通常焼却装置に具備されている排ガスの除塵装置へ供給して処理されるため、新たに除塵装置を設けることなく本発明を適用できる。
According to the present invention, it is possible to perform a stable cooling operation of drainage water such as a cooling can without the need for frequent cleaning such as cooling using a conventional heat exchanger. Moreover, the cooling water required by the indirect cooling method until now becomes unnecessary, and the utility cost can be reduced. In addition, if the waste water contains inorganic salts that corrode iron such as sodium chloride, it is necessary to use an expensive material such as a nickel alloy or titanium as the heat exchanger material. However, in the present invention, an inexpensive resin material can be applied, and the equipment cost is low.
On the other hand, the conventional indirect cooling method using a heat exchanger requires cooling air that has not been used, but this can be supplied from the combustion air blower originally provided in the incinerator and is necessary. Since the amount is very small, about 4%, compared to the required amount of combustion air in the incinerator, it is not a big burden. In addition, it is expected that new air exhausted from the cooling tower will be generated and this will be a load on the exhaust gas dust collector of the incinerator, but this is also the amount of the exhaust gas generated from the incinerator. Since it is as low as about 4%, the load increase of the dust collector is very slight.
Moreover, since the air discharged from the cooling tower is usually supplied to the exhaust gas dust remover provided in the incinerator and processed, the present invention can be applied without newly providing a dust remover.
１： 冷却塔
２： 燃焼空気ブロワー
３： 冷却缶排水
４： 冷却用空気
５： 燃焼空気
６： 冷却処理済の排水
７： 排出空気
８： 焼却炉
９： 排ガス集塵装置1: Cooling tower 2: Combustion air blower 3: Cooling can drainage 4: Cooling air 5: Combustion air 6: Cooled drainage 7: Exhaust air 8: Incinerator 9: Exhaust gas dust collector
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