JPH09313881A - Device for eliminating waste water discharge for boiler flue gas desulfurizer - Google Patents

Device for eliminating waste water discharge for boiler flue gas desulfurizer

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Publication number
JPH09313881A
JPH09313881A JP8138698A JP13869896A JPH09313881A JP H09313881 A JPH09313881 A JP H09313881A JP 8138698 A JP8138698 A JP 8138698A JP 13869896 A JP13869896 A JP 13869896A JP H09313881 A JPH09313881 A JP H09313881A
Authority
JP
Japan
Prior art keywords
desulfurization
waste
gas
water
exhaust gas
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
Application number
JP8138698A
Other languages
Japanese (ja)
Inventor
Fumihiko Yamaguchi
文彦 山口
Original Assignee
Ishikawajima Harima Heavy Ind Co Ltd
石川島播磨重工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ishikawajima Harima Heavy Ind Co Ltd, 石川島播磨重工業株式会社 filed Critical Ishikawajima Harima Heavy Ind Co Ltd
Priority to JP8138698A priority Critical patent/JPH09313881A/en
Publication of JPH09313881A publication Critical patent/JPH09313881A/en
Granted legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To dehydrate the water content discharged from a wet desulfurizer to lower costs by causing a part of waste gas to branch off from a main line leaading from a denitrification device to the wet desulfurizer to introduce it into a waste desulfurizing water treating device and spraying waste desulfurizing water into the desulfurizing waste water treating device. SOLUTION: A line leading from a denitrification device 2 to a wet desulfurizer 6 through an air heater 3 and an electric precipitator 4 is made a main line 10. A part of waste gas is caused to branch off from the main line 10 to introduce waste gas of high temperature at the outlet of the denitrification device 2 into a waste desulfurizing water treating device 8, and also waste water from the desulfurizer 6 is sprayed from spray nozzles 11 in the waste desulfurizing water treating device 8. Then, the water content of the waste water sprayed is evaporated by the wate gas of high temperature to deposit harmful materials contained in the waste water. After that, the waste gas is returned to the main line 10. In this way, the water content discharged from the wet delsulfurizer 6 is dehydrated to make waste water treatment easy and certain.

Description

【発明の詳細な説明】 Detailed Description of the Invention

【0001】 [0001]

【発明の属する技術分野】本発明は、オリマルジョン等がボイラで燃焼された後の高濃度硫黄酸化物(SOx )
を含んだ排煙ガスを処理する装置に関し、特に、湿式脱硫装置から排出される水分の無排水化を図る装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high concentration sulfur oxide (SOx) after orimulsion is burned in a boiler.

TECHNICAL FIELD The present invention relates to a device for treating flue gas containing methane, and particularly to a device for eliminating drainage of water discharged from a wet desulfurization device. TECHNICAL FIELD The present invention relates to a device for treating flue gas containing methane, and particularly to a device for eliminating drainage of water discharged from a wet desulfurization device.

【0002】 [0002]

【従来の技術】発電設備等におけるボイラには、これより発生する硫黄酸化物(SOx)を含む排ガスを処理するための排煙処理装置が設けられている。この排煙処理装置は、燃料を燃焼するボイラと、ボイラからの排ガスから窒素酸化物を除去する脱硝装置と、脱硝装置からの排ガスの熱回収をするエアヒータ(AH)と、エアヒータからの排ガス中のダストを除去する電気集塵器(E
P)と、電気集塵器からの排ガス中の硫黄酸化物を除去する脱硫装置と、脱硫直前に熱回収を行うガスガスヒータ(GGH)及び脱硫後に再加熱を行うガスガスヒータ(GGH)と、これら2個のガスガスヒータを連結して熱媒体を循環する循環パイプとで構成されている。 P), a desulfurization device that removes sulfur oxides in the exhaust gas from the electrostatic precipitator, a gas gas heater (GGH) that recovers heat immediately before desulfurization, and a gas gas heater (GGH) that reheats after desulfurization. It is composed of a circulation pipe that circulates a heat medium by connecting two gas gas heaters. 2. Description of the Related Art A boiler in a power generation facility or the like is provided with a flue gas treatment device for treating exhaust gas containing sulfur oxide (SOx) generated from the boiler. This flue gas treatment device is a boiler that burns fuel, a denitrification device that removes nitrogen oxides from exhaust gas from the boiler, an air heater (AH) that recovers heat from the exhaust gas from the denitration device, and the exhaust gas from the air heater. Electrostatic precipitator (E 2. Description of the Related Art A boiler in a power generation facility or the like is provided with a flue gas treatment device for treating exhaust gas containing sulfur oxide (SOx) generated from the boiler. This flue gas treatment device is a boiler that burns fuel, a denitrification device that removes nitrogen oxides from exhaust gas from the boiler, an air heater (AH) that recovers heat from the exhaust gas from the denitration device, and the exhaust gas from the air heater. Electrostatic precipitator (E)
P), a desulfurization device that removes sulfur oxides in the exhaust gas from the electrostatic precipitator, a gas gas heater (GGH) that recovers heat immediately before desulfurization, and a gas gas heater (GGH) that reheats after desulfurization. It is composed of a circulation pipe for connecting two gas heaters and circulating a heat medium. P), a desulfurization device that removes sulfur oxides in the exhaust gas from the electrostatic precipitator, a gas gas heater (GGH) that recovers heat immediately before desulfurization, and a gas gas heater (GGH) that reheats after desulfurization. It is composed of a circulation pipe for connecting two gas heaters and circulating a heat medium.

【0003】脱硫装置として湿式脱硫装置が使用される場合、その排水にはフッ素イオン,塩素イオン,アンモニウムイオン等の有害物質が含まれており、これらのイオンは、沈殿・濃縮等の方法で除去される。また、この排水は、投棄する前にCOD(化学的酸素要求量),p
H等についても処置される。 H and the like are also treated. When a wet desulfurization device is used as the desulfurization device, its wastewater contains harmful substances such as fluorine ions, chlorine ions and ammonium ions, and these ions are removed by a method such as precipitation and concentration. To be done. In addition, this wastewater is COD (chemical oxygen demand), p before being discarded. When a wet desulfurization device is used as the desulfurization device, its wastewater contains harmful substances such as fluorine ions, chloroform ions and ammonium ions, and these ions are removed by a method such as precipitation and concentration. To be done. In addition, this wastewater is COD (chemical oxygen demand), p before being discarded.
H etc. are also treated. H etc. are also treated.

【0004】 [0004]

【発明が解決しようとする課題】ところが、脱硫排水からの有害物質(フッ素イオン他)の除去を湿式ベースで行うと、処理が複雑な上にコストが高く、微量有害成分(Se 等) の除去が難しいという問題があった。また、
湿式ベースの処理方法の場合、放流前にCOD,pH調整等の処理も必要となり、設備が大型化すると共にコストを押し上げるという問題があった。 In the case of the wet-based treatment method, treatments such as COD and pH adjustment are also required before discharge, which causes a problem that the equipment becomes large and the cost is increased. However, if harmful substances (fluorine ions, etc.) are removed from the desulfurization wastewater on a wet basis, the treatment is complicated and the cost is high, and trace amounts of harmful components (Se, etc.) are removed. There was a problem that it was difficult. Also, However, if harmful substances (fluorine ions, etc.) are removed from the desulfurization wastewater on a wet basis, the treatment is complicated and the cost is high, and trace amounts of harmful components (Se, etc.) are removed. There was a problem that it was difficult. Also,
In the case of the wet-based treatment method, treatments such as COD and pH adjustment are also required before discharge, which causes a problem that the equipment becomes large and the cost is increased. In the case of the wet-based treatment method, treatments such as COD and pH adjustment are also required before discharge, which causes a problem that the equipment becomes large and the cost is increased.

【0005】そこで、脱硫排水を脱硫装置の吸収塔入口
部に導入、散布してその蒸発を図ることが提案されてい
るが、この方法の場合、大口径ダクト中へ排水を散布す
ることになるため均等な散布が困難であるばかりか、電
気集塵器を通過しないため析出した有害物質の除塵を効
果的に行えない。
Therefore, it has been proposed to introduce desulfurization wastewater into the absorption tower inlet of the desulfurization apparatus and sprinkle it to evaporate it, but in the case of this method, the wastewater is sprinkled into a large-diameter duct. Therefore, it is difficult to evenly disperse the particles, and the deposited harmful substances cannot be removed effectively because they do not pass through the electrostatic precipitator.

【0006】また、脱硫排水を電気集塵器(EP)の前
に導入、散布してその蒸発を図ることが提案されている
が、この方法でもやはり大口径ダクト中へ排水を散布す
ることに変わりがなく、均等な散布が困難である。
[0006] Further, it has been proposed to introduce desulfurization wastewater before the electrostatic precipitator (EP) and sprinkle it to evaporate it. However, this method also disperses wastewater into a large-diameter duct. There is no change and it is difficult to apply evenly.

【0007】そこで、本発明の目的は、湿式脱硫装置から排出される水分の無水化を図り、排水の処理を容易かつ確実にすると共にその処理に要するコストを節減するボイラ排煙脱硫装置の無排水化装置を提供することである。 Therefore, an object of the present invention is to eliminate the need for a boiler flue gas desulfurization apparatus to dehydrate the water discharged from the wet desulfurization apparatus to facilitate and ensure the treatment of waste water and reduce the cost required for the treatment. The purpose is to provide a drainage device.

【0008】 [0008]

【課題を解決するための手段】上記目的を達成するため
に請求項1の発明は、高硫黄分含有燃料をボイラで燃焼
させた排ガスを脱硝装置で脱硝後、湿式脱硫装置で脱硫
するボイラ排煙脱硫装置に付随する無排水化装置におい
て、脱硝装置から湿式脱硫装置に至る主ラインよりこの
排ガスの一部を分岐して脱硫排水処理装置に導入すると
共に、上記脱硫装置からの脱硫排水を上記脱硫排水処理
装置内にスプレして蒸発させ、その後この排ガスを上記
主ラインに戻すように構成されている。
In order to achieve the above object, the invention of claim 1 is a boiler exhaust system in which exhaust gas obtained by burning a fuel containing a high sulfur content in a boiler is denitrified by a denitration device and then desulfurized by a wet desulfurization device. In the drainage-free device accompanying the smoke desulfurization device, a part of this exhaust gas is branched from the main line from the denitration device to the wet desulfurization device and introduced into the desulfurization wastewater treatment device, and the desulfurization wastewater from the desulfurization device is described above. It is configured to spray and evaporate in the desulfurization wastewater treatment device, and then return the exhaust gas to the main line.

【0009】請求項2の発明は、高硫黄分含有燃料をボ
イラで燃焼した後の排ガスを脱硝装置で脱硝後、電気集
塵器で除塵して湿式脱硫装置で脱硫するボイラ排煙脱硫
装置に付随する無排水化装置において、脱硝装置からの
排ガスの一部を分岐して脱硫排水処理装置に導入すると
共に、上記脱硫装置からの脱硫排水を上記脱硫排水処理
装置内にスプレして蒸発させ、その後この排ガスを電気
集塵器の前に戻すように構成されている。
According to the second aspect of the present invention, there is provided a boiler flue gas desulfurization apparatus for denitrifying exhaust gas after burning a fuel having a high sulfur content in a boiler by a denitration apparatus, then removing dust by an electric precipitator and desulfurizing by a wet desulfurization apparatus. In the accompanying non-drainage device, while introducing a part of the exhaust gas from the denitrification device into the desulfurization wastewater treatment device, the desulfurization wastewater from the desulfurization device is sprayed and evaporated in the desulfurization wastewater treatment device, After that, the exhaust gas is returned to the front of the electrostatic precipitator.

【0010】 [0010]

【発明の実施の形態】本発明の好適実施の形態を添付図面により説明する。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

【0011】図1に、本発明の第一の実施の形態が示さ
れている。図示されるように、ボイラ1からの燃焼後の
排ガスは、誘引ファン(図示せず)によって強制排気さ
れ、脱硝装置2へと導かれて脱硝処理が行われる。脱硝
後の排ガスはかなり高温であることから、これより熱回
収するためにエアヒータ(AH)3で高温の排ガスと常
温の燃焼用空気との熱交換を行い、熱交換により高温と
なった燃焼用空気が、ボイラ1に供給される。このと
き、エアヒータ3出口での排ガスの温度が、例えばオリ
マルジョン排ガスの場合、SO3 の酸露点以上の約17
0℃となるように上記の熱交換が調節される。 The above heat exchange is adjusted to 0 ° C. FIG. 1 shows a first embodiment of the present invention. As shown in the figure, the exhaust gas after combustion from the boiler 1 is forcibly exhausted by an induction fan (not shown), guided to the denitration device 2, and subjected to denitration processing. Since the exhaust gas after denitration has a considerably high temperature, in order to recover heat from this, the air heater (AH) 3 exchanges heat between the high temperature exhaust gas and the combustion air at room temperature, and the heat for combustion becomes high. Air is supplied to the boiler 1. At this time, when the temperature of the exhaust gas at the outlet of the air heater 3 is, for example, an orimulsion exhaust gas, it is about 17 or higher than the acid dew point of SO 3. FIG. 1 shows a first embodiment of the present invention. As shown in the figure, the exhaust gas after combustion from the boiler 1 is forcibly exhausted by an induction fan (not shown), guided to the denitration device 2, and subjected to denitration processing. Since the exhaust gas after denitration has a considerably high temperature, in order to recover heat from this, the air heater (AH) 3 exchanges heat between the high temperature exhaust gas and the combustion air at room temperature, and the heat for combustion Air is supplied to the boiler 1. At this time, when the temperature of the exhaust gas at the outlet of the air heater 3 is, for example, an orimulsion exhaust gas, it is about 17 or higher than the acid dew point of SO 3.
The heat exchange is adjusted so that the temperature is 0 ° C. The heat exchange is adjusted so that the temperature is 0 ° C.

【0012】熱交換をした排ガスは、次に第1の電気集
塵器(EP)4へと導かれ除塵処理が行われ、除塵後の
排ガスは、ガスガスヒータ(GGH)5で約100℃ま
で除熱された後、湿式脱硫装置6に導入されて脱硫処理
が行われる。なお、本実施の形態においては、脱硝装置
2からエアヒータ3,電気集塵器4を介して湿式脱硫装
置6に至るラインが主ライン10を構成する。脱硫後の
排ガスは、ガスガスヒータ7により100℃前後まで加
熱され、煙突(図示されず)から排出される。以上によ
り、ボイラ排煙脱硫装置のメインシステムが形成され
る。
The heat-exchanged exhaust gas is then guided to the first electrostatic precipitator (EP) 4 and subjected to a dust removal process. The exhaust gas after dust removal is heated up to about 100 ° C. by the gas gas heater (GGH) 5. After the heat is removed, it is introduced into the wet desulfurization device 6 to be desulfurized. In the present embodiment, a line from the denitration device 2 to the wet desulfurization device 6 via the air heater 3 and the electrostatic precipitator 4 constitutes the main line 10. The exhaust gas after desulfurization is heated up to around 100 ° C. by the gas gas heater 7 and discharged from a chimney (not shown). By the above, the main system of the boiler flue gas desulfurization apparatus is formed.

【0013】上記のメインシステムに付随して、図示さ
れるように、脱硫装置6からの排水を導入してスプレ散
布すると共に、脱硝装置2の出口側からガスの一部を導
入して主ライン10に(第1の電気集塵器4と脱硫装置
6との間で)戻す脱硫排水処理装置8が設けられる。な
お、脱硫排水処理装置8は、GGH5の前(図1の矢印
A)で主ライン10に接続されても、あるいは脱硫装置
(吸収塔)6の前(図1の矢印B)で主ライン10に接
続されてもよい。
In connection with the main system described above, as shown in the drawing, the waste water from the desulfurization device 6 is introduced and sprayed, and at the same time, a part of the gas is introduced from the outlet side of the denitrification device 2. A desulfurization wastewater treatment device 8 for returning to (between the first electrostatic precipitator 4 and the desulfurization device 6) 10 is provided. The desulfurization wastewater treatment device 8 may be connected to the main line 10 in front of the GGH 5 (arrow A in FIG. 1), or in front of the desulfurization device (absorption tower) 6 (arrow B in FIG. 1). May be connected to.

【0014】脱硫排水処理装置8には、排水をスプレするスプレ11が設置される。このスプレ11は、確実な散布が可能かつ安価であればどのような構造でもよい。 The desulfurization wastewater treatment device 8 is provided with a spray 11 for spraying wastewater. The spray 11 may have any structure as long as it can be surely sprayed and is inexpensive.

【0015】脱硫排水処理装置8の下流側には、ダスト類(水分の蒸発により析出した固形分を含む)を除塵する第2の電気集塵器(EP)又はバグフィルタ9が設けられる。本実施の形態においては、脱硫排水処理装置8
及び第2の電気集塵器(EP)又はバグフィルタ9が、

ボイラ排煙脱硫装置の無排水化装置を構成する。 It constitutes a drainage-free device for the boiler flue gas desulfurization device. A second electrostatic precipitator (EP) or a bag filter 9 for removing dusts (including solid content deposited by evaporation of water) is provided on the downstream side of the desulfurization wastewater treatment device 8. In the present embodiment, the desulfurization wastewater treatment device 8 A second electrostatic precipitator (EP) or a bag filter 9 for removing dusts (including solid content evaporated by evaporation of water) is provided on the downstream side of the desulfurization wastewater treatment device 8. In the present embodiment, the desulfurization wastewater treatment device 8
And a second electrostatic precipitator (EP) or bag filter 9, And a second electrostatic precipitator (EP) or bag filter 9,
Configure a drainage-free device for boiler flue gas desulfurization equipment. Configure a drainage-free device for boiler flue gas desulfurization equipment.

【0016】脱硫装置6からの排水が、脱硫排水処理装
置8に導入され、スプレ11で散布される。脱硫排水処
理装置8には、また脱硝装置2の出口側からのガスの一
部がバイバスして導入される。すると、高温のガス(約
350℃)により、スプレ散布された排水の水分が蒸発
し、排水中に含まれていた有害物質(フッ素イオン,塩
素イオン他)が析出する。析出した有害物質は、その他
のダストと共に固形分として第2の電気集塵器(EP)
8で除塵される。 Dust is removed at 8. Wastewater from the desulfurization device 6 is introduced into the desulfurization wastewater treatment device 8 and sprayed by the spray 11. A part of the gas from the outlet side of the denitration device 2 is introduced into the desulfurization wastewater treatment device 8 by bypass. Then, the high-temperature gas (about 350 ° C.) evaporates the water content of the spray-dispersed wastewater, and deposits harmful substances (fluorine ions, chlorine ions, etc.) contained in the wastewater. The deposited harmful substances, together with other dust, are treated as a solid content in the second electrostatic precipitator (EP). Wastewater from the desulfurization device 6 is introduced into the desulfurization wastewater treatment device 8 by bypass. A part of the gas from the outlet side of the denitration device 2 is introduced into the desulfurization wastewater treatment device 8 by bypass. Then, the high-temperature gas (about 350 ° C.) evaporates the water content of the spray-dispersed wastewater, and deposits harmful substances (fluorine ions, desulfurized ions, etc.) contained in the wastewater. The deposited harmful substances, together with other dust, are treated as a solid content in the second electrostatic precipitator (EP).
Dust is removed at 8. Dust is removed at 8.

【0017】除塵された排ガスは、メインシステムに戻されるが、このとき排ガスをメインシステムのGGH5
の前(図1の矢印A)に戻しても、あるいは脱硫装置(吸収塔)6の前(図1の矢印B)に戻してもよい。 It may be returned to the front (arrow A in FIG. 1) or in front of the desulfurization apparatus (absorption tower) 6 (arrow B in FIG. 1). The exhaust gas from which dust has been removed is returned to the main system. At this time, the exhaust gas is returned to the main system GGH5. The exhaust gas from which dust has been removed is returned to the main system. At this time, the exhaust gas is returned to the main system GGH5.
1 (arrow A in FIG. 1) or before the desulfurization device (absorption tower) 6 (arrow B in FIG. 1). 1 (arrow A in FIG. 1) or before the desulfurization device (absorption tower) 6 (arrow B in FIG. 1).

【0018】なお、脱硝装置2出口から分岐される排ガ
スの量については、1000MWクラスでの脱硫排水を
約10T/hとした場合、ボイラ排ガスの3〜4%を分
岐すれば十分な蒸発が行われると考えられる。脱硝装置
2出口から分岐された排ガスの温度を約350℃とする
と、脱硫排水処理装置8で水分が蒸発する際の温度降下
は約200°であり、脱硫排水処理装置8を出る排ガス
の温度は約150℃となる。この温度であれば、排出ガ
スを電気集塵器(EP)4の前,ガスガスヒータ(GG
H)5の前,脱硫装置(吸収塔)6の前のいずれに戻すことも可能である。 It is possible to return to either the front of H) 5 or the front of the desulfurization apparatus (absorption tower) 6. 本実施の形態において、脱硫排水処理装置8を通過後の排出ガスは、GGH5の前に戻されるか(矢印A)、あるいは脱硫装置(吸収塔)6の前(矢印B)に戻される。 In the present embodiment, the exhaust gas after passing through the desulfurization wastewater treatment device 8 is returned to the front of the GGH 5 (arrow A) or to the front of the desulfurization device (absorption tower) 6 (arrow B). Regarding the amount of the exhaust gas branched from the outlet of the denitration device 2, when the desulfurization waste water of 1000 MW class is about 10 T / h, sufficient evaporation can be performed by branching 3 to 4% of the boiler exhaust gas. It is believed that Assuming that the temperature of the exhaust gas branched from the outlet of the denitration device 2 is about 350 ° C., the temperature drop when the water is evaporated in the desulfurization wastewater treatment device 8 is about 200 °, and the temperature of the exhaust gas leaving the desulfurization wastewater treatment device 8 is It becomes about 150 ° C. At this temperature, the exhaust gas is discharged in front of the electrostatic precipitator (EP) 4 and the gas gas heater (GG). Regarding the amount of the exhaust gas from from the outlet of the denitration device 2, when the desulfurization waste water of 1000 MW class is about 10 T / h, sufficient evaporation can be performed by branching 3 to 4% of the boiler exhaust gas. It is believed that Assuming that the temperature of the exhaust gas from from the outlet of the denitration device 2 is about 350 ° C., the temperature drop when the water is particularly in the desulfurization wastewater treatment device 8 is about 200 °, and the temperature of the exhaust gas leaving the desulfurization wastewater treatment device 8 is It becomes about 150 ° C. At this temperature, the exhaust gas is discharged in front of the electrostatic precipitator (EP) 4 and the gas gas heater (GG).
It can be returned to either before H) 5 or before desulfurization device (absorption tower) 6. In the present embodiment, the exhaust gas after passing through the desulfurization wastewater treatment device 8 is returned to the front of the GGH 5 (arrow A) or the front of the desulfurization device (absorption tower) 6 (arrow B). It can be returned to either before H) 5 or before desulfurization device (absorption tower) 6. In the present embodiment, the exhaust gas after passing through the desulfurization wastewater treatment device 8 is returned to the front of the GGH 5 (arrow A) or the front of the desulfurization device (absorption tower) 6 (arrow B).

【0019】図2に、本発明の第2の実施の形態が示さ
れている。図示されるように、ボイラ1からの燃焼後の
排ガスが、誘引ファン(図示せず)によって強制排気さ
れ、脱硝装置2へと導かれて脱硝処理が行われる。脱硝
後の排ガスはかなり高温であることから、これより熱回
収するためにエアヒータ(AH)3で高温の排ガスと常
温の燃焼用空気との熱交換を行い、熱交換により高温と
なった燃焼用空気が、ボイラ1に供給される。このと
き、エアヒータ3出口での排ガスの温度が、例えばオリ
マルジョン排ガスの場合、SO3 の酸露点以上の約17
0℃となるように上記の熱交換が調節される。 The above heat exchange is adjusted to 0 ° C. FIG. 2 shows a second embodiment of the present invention. As shown in the figure, the exhaust gas after combustion from the boiler 1 is forcibly exhausted by an induction fan (not shown), is guided to the denitration device 2, and is subjected to denitration processing. Since the exhaust gas after denitration has a considerably high temperature, in order to recover heat from this, the air heater (AH) 3 exchanges heat between the high temperature exhaust gas and the combustion air at room temperature, and the heat for combustion becomes high. Air is supplied to the boiler 1. At this time, when the temperature of the exhaust gas at the outlet of the air heater 3 is, for example, an orimulsion exhaust gas, it is about 17 or higher than the acid dew point of SO 3. FIG. 2 shows a second embodiment of the present invention. As shown in the figure, the exhaust gas after combustion from the boiler 1 is forcibly exhausted by an induction fan (not shown), is guided to the denitration device 2, and is subjected to denitration processing. Since the exhaust gas after denitration has a considerably high temperature, in order to recover heat from this, the air heater (AH) 3 exchanges heat between the high temperature exhaust gas and the combustion air at room temperature, and the heat for combustion becomes high. Air is supplied to the boiler 1. At this time, when the temperature of the exhaust gas at the outlet of the air heater 3 is, for example, an orimulsion exhaust gas, it is about 17 or higher than the acid dew point of SO 3.
The heat exchange is adjusted so that the temperature is 0 ° C. The heat exchange is adjusted so that the temperature is 0 ° C.

【0020】熱交換をした排ガスは、次に電気集塵器
(EP)4へと導かれ除塵処理が行われ、除塵後の排ガ
スは、ガスガスヒータ(GGH)5で約100℃まで除
熱された後、湿式脱硫装置6に導入されて脱硫処理が行
われる。脱硫後の排ガスは、ガスガスヒータ7により1
00℃前後まで加熱され、煙突(図示されず)から排出される。 It is heated to around 00 ° C. and discharged from a chimney (not shown). 以上により、ボイラ排煙脱硫装置のメインシステムが形成される。 From the above, the main system of the boiler flue gas desulfurization apparatus is formed. The heat-exchanged exhaust gas is then guided to the electrostatic precipitator (EP) 4 for dust removal treatment, and the exhaust gas after dust removal is removed to about 100 ° C. by the gas gas heater (GGH) 5. After that, it is introduced into the wet desulfurization device 6 and subjected to desulfurization treatment. Exhaust gas after desulfurization is 1 by the gas gas heater 7. The heat-exchanged exhaust gas is then guided to the electrostatic precipitator (EP) 4 for dust removal treatment, and the exhaust gas after dust removal is removed to about 100 ° C. by the gas gas heater (GGH) 5. After that, Exhaust gas after desulfurization is 1 by the gas gas heater 7. it is introduced into the wet desulfurization device 6 and subjected to desulfurization treatment.
It is heated to around 00 ° C and discharged from a stack (not shown). By the above, the main system of the boiler flue gas desulfurization apparatus is formed. It is heated to around 00 ° C and discharged from a stack (not shown). By the above, the main system of the boiler flue gas desulfurization apparatus is formed.

【0021】上記のメインシステムに付随して、図示さ
れるように、脱硫装置6からの排水を導入してスプレ散
布すると共に、脱硝装置2の出口側からガスの一部を導
入してエアヒータ3と電気集塵器4との間に戻す脱硫排
水処理装置8が設けられる。脱硫排水処理装置8には、
排水をスプレするスプレ11が設置される。 A spray 11 for spraying drainage is installed. このスプレ11は、確実な散布が可能かつ安価であればどのような構造でもよい。 The spray 11 may have any structure as long as it can be reliably sprayed and is inexpensive. 本実施の形態においては、この脱硫排水処理装置8のみがボイラ排煙脱硫装置の無排水化装置を構成する。 In the present embodiment, only this desulfurization wastewater treatment device 8 constitutes a drainage-free device for the boiler flue gas desulfurization device. As shown in the figure, accompanying the main system described above, the waste water from the desulfurization device 6 is introduced and sprayed, and at the same time, a part of the gas is introduced from the outlet side of the denitration device 2 to make the air heater 3. A desulfurization wastewater treatment device 8 is provided between the device and the electrostatic precipitator 4. In the desulfurization wastewater treatment device 8, As shown in the figure, accompanying the main system described above, the waste water from the desulfurization device 6 is introduced and sprayed, and at the same time, a part of the gas is introduced from the outlet side of the denitration device 2 to make the air heater 3. A desulfurization wastewater treatment device 8 is provided between the device and the electrostatic precipitator 4. In the desulfurization wastewater treatment device 8,
A spray 11 for spraying waste water is installed. The spray 11 may have any structure as long as it can be surely sprayed and is inexpensive. In the present embodiment, only the desulfurization wastewater treatment device 8 constitutes a non-drainage device of the boiler flue gas desulfurization device. A spray 11 for spraying wastewater is installed. The spray 11 may have any structure as long as it can be surely sprayed and is inexpensive. In the present embodiment, only the desulfurization wastewater treatment device 8 correctly a non-drainage device of the boiler flue gas desulfurization device.

【0022】脱硫装置6からの排水が、脱硫排水処理装
置8に導入され、スプレ11で散布される。脱硫排水処
理装置8には、また脱硝装置2の出口側からのガスの一
部がバイバスして導入される。すると、高温のガス(約
350℃)により、スプレ散布された排水の水分が蒸発
し、排水中に含まれていた有害物質(フッ素イオン,塩
素イオン他)等が析出する。
Wastewater from the desulfurization device 6 is introduced into the desulfurization wastewater treatment device 8 and sprayed by the spray 11. A part of the gas from the outlet side of the denitration device 2 is introduced into the desulfurization wastewater treatment device 8 by bypass. Then, the high temperature gas (about 350 ° C.) evaporates the water content of the spray-dispersed wastewater, and deposits harmful substances (fluorine ions, chlorine ions, etc.) contained in the wastewater.

【0023】析出した有害物質を含む排ガスは、電気集塵器(EP)4の前でメインシステムに戻され、ダスト類(水分の蒸発により析出した固形分も含む)が除塵される。 The exhaust gas containing the deposited harmful substances is returned to the main system in front of the electrostatic precipitator (EP) 4 to remove dusts (including solid contents deposited by evaporation of water).

【0024】つまり、本実施の形態においては、脱硫排水処理装置8内での脱硫排水の蒸発により析出した有害物質は、排ガスと共にメインシステムの電気集塵器(E
P)4の前に導入され、電気集塵器4により除塵されるので、第一の実施例のように脱硫排水処理装置8に付随する第2の電気集塵器(EP)9を設ける必要がない。 Since it is introduced before P) 4 and dust is removed by the electrostatic precipitator 4, it is necessary to provide a second electrostatic precipitator (EP) 9 attached to the desulfurization wastewater treatment apparatus 8 as in the first embodiment. There is no.
しかし、この場合、電気集塵器4は従来の除塵に加えて脱硫排水から析出したダストも除塵することになり、負担が増加するので、第一の実施例よりも若干処理能力の高いものを使用することが望ましい。 However, in this case, in addition to the conventional dust removal, the electrostatic precipitator 4 also removes the dust precipitated from the desulfurized wastewater, which increases the burden. Therefore, the electrostatic precipitator 4 has a slightly higher processing capacity than that of the first embodiment. It is desirable to use. In other words, in the present embodiment, the harmful substances deposited by the evaporation of the desulfurization wastewater in the desulfurization wastewater treatment device 8 together with the exhaust gas are collected by the electrostatic precipitator (E) of the main system. In other words, in the present embodiment, the harmful substances deposited by the evaporation of the desulfurization wastewater in the desulfurization wastewater treatment device 8 together with the exhaust gas are collected by the electrostatic precipitator (E) of the main system.
P) 4 is introduced before and is removed by the electrostatic precipitator 4, so it is necessary to provide a second electrostatic precipitator (EP) 9 attached to the desulfurization wastewater treatment device 8 as in the first embodiment. There is no. P) 4 is introduced before and is removed by the electrostatic precipitator 4, so it is necessary to provide a second electrostatic precipitator (EP) 9 attached to the desulfurization wastewater treatment device 8 as in the first embodiment. There is no.
However, in this case, the electrostatic precipitator 4 also removes the dust deposited from the desulfurization wastewater in addition to the conventional dust removal, which increases the load. It is desirable to use. However, in this case, the electrostatic precipitator 4 also removes the dust deposited from the desulfurization wastewater in addition to the conventional dust removal, which increases the load. It is desirable to use.

【0025】この第二の実施の形態において、上記で説明された以外の詳細については第1の実施の形態と同一であるので、説明を省略する。 The details of the second embodiment other than those described above are the same as those of the first embodiment, and therefore the description thereof is omitted.

【0026】以上、要するに本発明においては、脱硝装
置の出口部の高温のガスを一部分岐し、このガスを脱硫
装置からの排水の蒸発に利用して有害物質を析出させる
ので、従来用いられて来た湿式法による脱硫排水処理装
置が不要になり、コスト節減になると共に、従来では除
去が困難であった微量有害成分も容易かつ確実に除去で
きる。また、従来、排水の放流前に行わねばならなかっ
たCODやpHの調整も不要になるので、やはり設備を
小型化できると共にコストを節減できる。
In summary, according to the present invention, the high temperature gas at the outlet of the denitration device is partially branched and this gas is used to evaporate the waste water from the desulfurization device to precipitate harmful substances. The desulfurization wastewater treatment equipment by the wet method which has come is no longer required, which reduces the cost and easily and surely removes a trace amount of harmful components which have been difficult to remove in the past. In addition, since COD and pH adjustment, which had to be performed before the discharge of waste water, is no longer necessary, the equipment can be downsized and the cost can be reduced.

【0027】 [0027]

【発明の効果】以上、要するに本発明に係るボイラ排煙脱硫装置の無排水化装置においては、脱硝装置の出口部の高温のガスを一部分岐し、このガスを脱硫装置からの排水の蒸発に利用して有害物質を析出させるので、従来用いられて来た湿式法による脱硫排水処理装置が不要になり、コスト節減になると共に、従来では除去が困難であった微量有害成分も容易かつ確実に除去できる。また、従来、排水の放流前に行わねばならなかったCOD
やpHの調整も不要になるので、やはり設備を小型化できると共にコストを節減できる。 And pH adjustment is not required, so the equipment can be downsized and the cost can be reduced. As described above, in short, in the drainage-free apparatus of the boiler flue gas desulfurization apparatus according to the present invention, a part of the high temperature gas at the outlet of the denitration apparatus is branched and this gas is used to evaporate the wastewater from the desulfurization apparatus. Since the harmful substances are deposited by using it, the desulfurization wastewater treatment equipment by the wet method which has been used conventionally is not required, and the cost is reduced, and the trace amount of harmful components that were difficult to remove in the past can be easily and surely. Can be removed. In addition, the COD that had to be performed before the discharge of wastewater As described above, in short, in the drainage-free apparatus of the boiler flue gas desulfurization apparatus according to the present invention, a part of the high temperature gas at the outlet of the denitration apparatus is served and this gas is used to evaporate the wastewater from the desulfurization apparatus. Since the harmful substances are deposited by using it, the desulfurization wastewater treatment equipment by the wet method which has been used repeatedly is not required, and the cost is reduced, and the trace amount of harmful components that were difficult In addition, the COD that had to be performed before the discharge of wastewater. To remove in the past can be easily and surely. Can be removed.
Since no adjustment of pH or pH is required, the equipment can be downsized and the cost can be reduced. Since no adjustment of pH or pH is required, the equipment can be downsized and the cost can be reduced.

【図面の簡単な説明】 [Brief description of drawings]

【図1】本発明のボイラ排煙脱硫装置の無排水化装置の第一の実施の形態を示す概略図である。 FIG. 1 is a schematic view showing a first embodiment of a drainage-free apparatus for a boiler flue gas desulfurization apparatus according to the present invention.

【図2】本発明のボイラ排煙脱硫装置の無排水化装置の第二の実施の形態を示す概略図である。 FIG. 2 is a schematic view showing a second embodiment of a drainage-free apparatus for a boiler flue gas desulfurization apparatus according to the present invention.

【符合の説明】 [Description of sign]

1 ボイラ 2 脱硝装置 3 エアヒータ 4 (第1の)電気集塵器 5 ガスガスヒータ 6 湿式脱硫装置 7 ガスガスヒータ 8 脱硫排水処理装置 9 第2の電気集塵器(又はバグフィルタ) 10 主ライン 11 スプレ1 Boiler 2 Denitrification Device 3 Air Heater 4 (First) Electrostatic Precipitator 5 Gas Gas Heater 6 Wet Desulfurization Device 7 Gas Gas Heater 8 Desulfurization Wastewater Treatment Device 9 Second Electrostatic Precipitator (or Bag Filter) 10 Main Line 11 Spray

Claims (2)

    【特許請求の範囲】 [Claims]
  1. 【請求項1】 高硫黄分含有燃料をボイラで燃焼させた排ガスを脱硝装置で脱硝後、湿式脱硫装置で脱硫するボイラ排煙脱硫装置に付随する無排水化装置において、脱硝装置から湿式脱硫装置に至る主ラインよりこの排ガスの一部を分岐して脱硫排水処理装置に導入すると共に、
    上記脱硫装置からの脱硫排水を上記脱硫排水処理装置内にスプレして蒸発させ、その後この排ガスを上記主ラインに戻すことを特徴とするボイラ排煙脱硫装置の無排水化装置。 A non-drainage device for a boiler flue gas desulfurization device, which comprises spraying desulfurized wastewater from the desulfurization device into the desulfurization wastewater treatment device to evaporate it, and then returning the exhaust gas to the main line. 1. A wet desulfurization system from a denitration system to a drainage removal system associated with a boiler flue gas desulfurization system in which exhaust gas obtained by burning a high sulfur-containing fuel in a boiler is desulfurized in a denitration system and then desulfurized in a wet desulfurization system. A part of this exhaust gas is branched from the main line leading to and introduced into the desulfurization wastewater treatment equipment, 1. A wet desulfurization system from a denitration system to a drainage removal system associated with a boiler flue gas desulfurization system in which exhaust gas obtained by burning a high sulfur-containing fuel in a boiler is desulfurized in a denitration system and then desulfurized in a wet desulfurization system. A part of this exhaust gas is initiated from the main line leading to and introduced into the desulfurization wastewater treatment equipment,
    A non-drainage device for a boiler flue gas desulfurization device, characterized in that desulfurization wastewater from the desulfurization device is sprayed into the desulfurization wastewater treatment device to evaporate and then the exhaust gas is returned to the main line. A non-drainage device for a boiler flue gas desulfurization device, characterized in that desulfurization wastewater from the desulfurization device is sprayed into the desulfurization wastewater treatment device to evaporate and then the exhaust gas is returned to the main line.
  2. 【請求項2】 高硫黄分含有燃料をボイラで燃焼した後
    の排ガスを脱硝装置で脱硝後、電気集塵器で除塵して湿
    式脱硫装置で脱硫するボイラ排煙脱硫装置に付随する無
    排水化装置において、脱硝装置からの排ガスの一部を分
    岐して脱硫排水処理装置に導入すると共に、上記脱硫装
    置からの脱硫排水を上記脱硫排水処理装置内にスプレし
    て蒸発させ、その後この排ガスを電気集塵器の前に戻す
    ことを特徴とするボイラ排煙脱硫装置の無排水化装置。
    2. No drainage associated with a boiler flue gas desulfurization device in which exhaust gas after burning high sulfur content fuel in a boiler is denitrified by a denitration device, then dust is removed by an electric precipitator, and desulfurization is performed by a wet desulfurization device. In the device, a part of the exhaust gas from the denitrification device is branched and introduced into the desulfurization wastewater treatment device, and the desulfurization wastewater from the desulfurization device is sprayed into the desulfurization wastewater treatment device to evaporate, and then this exhaust gas is converted into electricity. A drainage-free device for a boiler flue gas desulfurization device characterized by being returned to the front of a dust collector.
JP8138698A 1996-05-31 1996-05-31 Device for eliminating waste water discharge for boiler flue gas desulfurizer Granted JPH09313881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8138698A JPH09313881A (en) 1996-05-31 1996-05-31 Device for eliminating waste water discharge for boiler flue gas desulfurizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8138698A JPH09313881A (en) 1996-05-31 1996-05-31 Device for eliminating waste water discharge for boiler flue gas desulfurizer

Publications (1)

Publication Number Publication Date
JPH09313881A true JPH09313881A (en) 1997-12-09

Family

ID=15228040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8138698A Granted JPH09313881A (en) 1996-05-31 1996-05-31 Device for eliminating waste water discharge for boiler flue gas desulfurizer

Country Status (1)

Country Link
JP (1) JPH09313881A (en)

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