JP2007301519A - Clogging inhibition method of flue for sulfur containing exhaust gas, and flue for sulfur containing exhaust gas - Google Patents

Clogging inhibition method of flue for sulfur containing exhaust gas, and flue for sulfur containing exhaust gas Download PDF

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JP2007301519A
JP2007301519A JP2006134788A JP2006134788A JP2007301519A JP 2007301519 A JP2007301519 A JP 2007301519A JP 2006134788 A JP2006134788 A JP 2006134788A JP 2006134788 A JP2006134788 A JP 2006134788A JP 2007301519 A JP2007301519 A JP 2007301519A
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exhaust gas
flue
sulfur
containing exhaust
water
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JP4715629B2 (en
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Shigeru Nishiyama
西山  茂
Yutaka Hasegawa
豊 長谷川
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Mitsubishi Materials Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a clogging inhibition method of a flue for a sulfur containing exhaust gas capable of surly preventing a fouling from generating in the flue for the sulfur containing gas which introduces the sulfur containing gas to a wet desulfurization apparatus from an absorption column of a sulfuric acid factory, and capable of efficiently absorbing SO<SB>2</SB>gas without losing a water balance in the wet desulfurization apparatus. <P>SOLUTION: The clogging inhibition method of the flue 10 for the sulfur containing exhaust gas having a humidity controlling part 13 which lowers a temperature of the exhaust gas by spraying an absorbing liquid from the apparatus 30 performing a wet desulfurization process at the inlet of the flue 10 introducing the high-temperature exhaust gas to the apparatus 30 performing the wet desulfurization process comprises finding a vaporized water amount W by multiplying a saturated steam amount G at a temperature of the exhaust gas flowing in the flue 10 for the sulfur containing exhaust gas by a flow volume V of the exhaust gas, and supplying a makeup water of within the range of 20-100% of the vaporized water amount W to the flue 10 for the sulfur containing exhaust gas. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、硫酸工場の吸収塔等から排出される含硫排気ガスを湿式脱硫工程を行う装置へと導くための含硫排気ガス用煙道の閉塞防止方法及び含硫排気ガス用煙道に関するものである。   The present invention relates to a method for preventing clogging of a flue for a sulfur-containing exhaust gas and a flue for a sulfur-containing exhaust gas for guiding sulfur-containing exhaust gas discharged from an absorption tower or the like of a sulfuric acid factory to an apparatus for performing a wet desulfurization process. Is.

一般に、硫酸工場の吸収塔等から排出される排気ガスには、通常、0.2%から0.3%程度のSOガスが含有されているため、この排気ガスは、さらに湿式脱硫装置へと送られて湿式脱硫工程を経た後に外部へと排出される。
ここで、硫酸工場の吸収塔等から排出される含硫排気ガスを、前記湿式脱硫装置へと導入するために含硫排気ガス用煙道が使用される。
Generally, exhaust gas discharged from an absorption tower or the like of a sulfuric acid factory usually contains about 0.2% to 0.3% SO 2 gas, and this exhaust gas is further supplied to a wet desulfurization apparatus. And is discharged to the outside after a wet desulfurization process.
Here, a sulfur-containing exhaust gas flue is used to introduce sulfur-containing exhaust gas discharged from an absorption tower or the like of a sulfuric acid factory into the wet desulfurization apparatus.

従来、この含硫排気ガス用煙道は、主にスチール材で構成されていたが、硫酸によって腐食され易いために寿命が短く、さらに重量も重いためにその交換作業等も困難であった。そこで、近年では、軽量かつ耐食性に優れた繊維強化プラスチック(FRP)にて構成された含硫排気ガス用煙道が広く使用されている。   Conventionally, the flue for sulfur-containing exhaust gas has been mainly composed of a steel material, but its life is short because it is easily corroded by sulfuric acid, and its replacement is difficult because it is heavy. Therefore, in recent years, a flue for sulfur-containing exhaust gas made of fiber reinforced plastic (FRP) that is lightweight and excellent in corrosion resistance has been widely used.

ところで、このFRPは、その耐熱温度が80℃以下であり高温に弱いものである。通常、硫酸工場の吸収塔等から排出される排気ガスの温度は80℃程度であるため、直接、FRP製の含硫排気ガス用煙道へと導入することができない。また、FRPは、濃硫酸に対しては耐食性を有しておらず腐食されてしまう。このため、前記煙道の入口部に、冷却水を吹き付ける調湿部を備え、この調湿部によって排気ガスの温度を30℃程度まで低下させるとともに、硫酸の濃度を低下させた後に、排気ガスをFRP製の含硫排気ガス用煙道へと導入するものが提供されている。
調湿部で吹き付けられる冷却水としては、含硫排水処理量を低減する目的で、通常、湿式脱硫装置からの吸収液を再利用している。
By the way, this FRP has a heat-resistant temperature of 80 ° C. or less and is vulnerable to high temperatures. Usually, since the temperature of the exhaust gas discharged from the absorption tower of a sulfuric acid factory is about 80 ° C., it cannot be directly introduced into a flue for sulfur-containing exhaust gas made of FRP. FRP does not have corrosion resistance against concentrated sulfuric acid and is corroded. For this reason, the humidity control part which blows cooling water is provided in the inlet part of the said flue, and while reducing the temperature of exhaust gas to about 30 degreeC by this humidity control part and reducing the density | concentration of a sulfuric acid, exhaust gas Is introduced into a flue for sulfur-containing exhaust gas made of FRP.
As the cooling water sprayed in the humidity control section, the absorbing liquid from the wet desulfurization apparatus is usually reused for the purpose of reducing the amount of sulfur-containing wastewater treated.

ここで、湿式脱硫装置は、例えば、硫黄酸化物等を含有する排気ガスを、酸化アルミニウムや消石灰スラリー等の吸収剤を含有する吸収液中に通じて、前記排気ガス中の硫黄酸化物を吸収し、さらにこの吸収物を石膏化して脱硫するものである。
よって、前記湿式脱硫装置の吸収液には、カルシウムイオン(Ca2+)や、硫酸カルシウム(CaSO)等が含有されており、この吸収液を利用した前記冷却水の中にも、カルシウムイオンやCaSOが存在することになる。
Here, the wet desulfurization apparatus absorbs the sulfur oxide in the exhaust gas by passing the exhaust gas containing sulfur oxide or the like through an absorbent containing an absorbent such as aluminum oxide or slaked lime slurry. Further, the absorbent is made into gypsum and desulfurized.
Therefore, the absorption liquid of the wet desulfurization apparatus contains calcium ions (Ca 2+ ), calcium sulfate (CaSO 4 ), and the like. In the cooling water using this absorption liquid, calcium ions and CaSO 4 will be present.

このため、調湿部において、高温の含硫排気ガスに前記冷却水を吹き付けた場合には、冷却水の中にもともと含有されているCaSO、及び、含硫排気ガス中のSOガスと冷却水の中のカルシウムイオンとが反応して生成したCaSOを主成分とする石膏性の付着物が、煙道の内部に発生することがある。 Therefore, the humidity unit, when spraying the cooling water in the hot sulfur-containing exhaust gas, CaSO are originally contained in the cooling water 4, and the SO 2 gas in the sulfur-containing exhaust gas Gypsum deposits mainly composed of CaSO 4 produced by reaction with calcium ions in the cooling water may occur inside the flue.

このような石膏性の付着物は、放置しておくと次第に堆積していき、これに伴って煙道内の開口部面積が小さくなる。付着物による煙道内の狭窄によって含硫排気ガスの通過が困難となり、湿式脱硫装置へ含硫排気ガスを十分に供給することができず、湿式脱硫装置の処理能力が低下してしまうことがあった。   Such gypsum deposits gradually accumulate if left unattended, and the opening area in the flue is reduced accordingly. Constriction of the flue due to deposits makes it difficult for sulfur-containing exhaust gas to pass through, and the sulfur-containing exhaust gas cannot be sufficiently supplied to the wet-type desulfurization device, resulting in a decrease in the processing capacity of the wet-type desulfurization device. It was.

この煙道内の付着物を除去する方法として、煙道内の付着物が発生し易い箇所、例えばコーナ部や分岐部に水を吹き付けて、その水圧によって付着物を吹き飛ばして洗い流すものが提案されている。しかし、この方法では、湿式脱硫装置の系内に、外部から水が導入されることになり、湿式脱硫装置内における水バランスが崩れてしまい、SOガスの吸収効率が著しく低下してしまうといった問題があった。 As a method for removing the deposits in the flue, a method has been proposed in which water is sprayed on a portion where deposits are likely to be generated in the flue, for example, a corner portion or a branch portion, and the deposit is blown away by the water pressure and washed away. . However, in this method, water is introduced from the outside into the system of the wet desulfurization apparatus, the water balance in the wet desulfurization apparatus is broken, and the absorption efficiency of SO 2 gas is remarkably lowered. There was a problem.

そこで、特許文献1では、煙道内の付着物を除去するために吹き付ける水として、前記湿式脱硫装置の吸収液を利用する含硫排気ガス用煙道の閉塞防止方法が提案されている。
この含硫排気ガス用煙道の閉塞防止方法では、煙道内の付着物を効果的に除去できるとともに、湿式脱硫装置の系内の水を使用するために湿式脱硫装置における水バランスを保つことができ、湿式脱硫装置においてSOガスを効率良く吸収できるものである。
特許第2973562号公報
Therefore, Patent Document 1 proposes a method for preventing clogging of a flue for a sulfur-containing exhaust gas that uses an absorption liquid of the wet desulfurization apparatus as water to be sprayed to remove deposits in the flue.
In this method for preventing clogging of a flue for sulfur-containing exhaust gas, deposits in the flue can be effectively removed, and water in the wet desulfurization system can be maintained in order to use the water in the wet desulfurization system. The SO 2 gas can be efficiently absorbed in the wet desulfurization apparatus.
Japanese Patent No. 2973562

ところで、硫酸工場から排出される含硫排気ガスは、水分を含んでいない乾燥ガスである。そこで、煙道内において、乾燥した含硫排気ガスに吸収液を供給した場合には、その排気ガス温度における飽和水蒸気量分だけ水分が蒸発することになる。例えば、排気ガス温度が30℃である場合には、乾燥した含硫排気ガス1Nm当たり35gの水分が蒸発することになる。 By the way, the sulfur-containing exhaust gas discharged from the sulfuric acid factory is a dry gas that does not contain moisture. Therefore, when the absorbing liquid is supplied to the dried sulfur-containing exhaust gas in the flue, the water evaporates by the amount of saturated water vapor at the exhaust gas temperature. For example, when the exhaust gas temperature is 30 ° C., 35 g of water evaporates per 1 Nm 3 of the dried sulfur-containing exhaust gas.

ここで、吸収液中のカルシウムについては、常温で飽和状態であるため、水分が蒸発した分だけカルシウムが過飽和となり、カルシウムが析出し易くなってしまう。このように吸収液を冷却水として、あるいは付着物の除去のために使用した場合には、煙道の内壁面に、カルシウム起因の付着物が発生してしまうことがあった。
特に、煙道の長さが長い場合には、水分が蒸発してカルシウムが過飽和になった吸収液が長時間煙道内に滞留するために、カルシウムが析出して付着物が発生し易くなるといった問題があった。
Here, since the calcium in the absorbing solution is saturated at normal temperature, the calcium is supersaturated as much as the water is evaporated, and calcium is likely to precipitate. In this way, when the absorbing liquid is used as cooling water or for removal of deposits, deposits due to calcium may occur on the inner wall surface of the flue.
In particular, when the length of the flue is long, the absorption liquid in which the moisture is evaporated and the calcium is supersaturated stays in the flue for a long time, so that calcium is deposited and deposits are easily generated. There was a problem.

本発明は、上述した状況に鑑みてなされたものであって、硫酸工場の吸収塔等から湿式脱硫装置へと含硫排気ガスを導く含硫排気ガス用煙道の内部に付着物が発生することを確実に防止できるとともに、湿式脱硫装置における水バランスを崩すことなくSOガスを効率的に吸収できる含硫排気ガス用煙道の閉塞防止方法及び含硫排気ガス用煙道を提供することを目的とする。 The present invention has been made in view of the above-described situation, and deposits are generated inside a flue for a sulfur-containing exhaust gas that guides the sulfur-containing exhaust gas from an absorption tower or the like of a sulfuric acid factory to a wet desulfurization apparatus. The present invention provides a method for preventing clogging of a flue for a sulfur-containing exhaust gas and a flue for a sulfur-containing exhaust gas, which can reliably prevent this, and can efficiently absorb SO 2 gas without destroying the water balance in a wet desulfurization apparatus. With the goal.

上記課題を解決するために、本発明では以下の手段を提案している。
本発明に係る含硫排気ガス用煙道の閉塞防止方法は、高温の排気ガスを湿式脱硫工程を行う装置へと導く煙道の入口に、前記湿式脱硫工程を行う装置からの吸収液を吹き付けて前記排気ガスの温度を低下させる調湿部を有する含硫排気ガス用煙道の閉塞防止方法であって、前記含硫排気ガス用煙道を流通する前記排気ガス温度における飽和水蒸気量Gと、前記排気ガスの流量Vとを乗積することにより蒸発水量Wを算出し、前記含硫排気ガス用煙道に、前記蒸発水量Wの20%から100%の範囲内の補給水を添加することを特徴としている。
In order to solve the above problems, the present invention proposes the following means.
In the method for preventing clogging of a flue for a sulfur-containing exhaust gas according to the present invention, the absorbing liquid from the apparatus for performing the wet desulfurization process is sprayed on the inlet of the flue that leads the high-temperature exhaust gas to the apparatus for performing the wet desulfurization process. A method for preventing the blockage of a flue gas for a sulfur-containing exhaust gas having a humidity control unit that lowers the temperature of the exhaust gas, and a saturated water vapor amount G at the temperature of the exhaust gas flowing through the flue gas for a sulfur-containing exhaust gas, The amount of evaporated water W is calculated by multiplying the flow rate V of the exhaust gas, and makeup water in a range of 20% to 100% of the amount of evaporated water W is added to the sulfur-containing exhaust gas flue. It is characterized by that.

この構成の含硫排気ガス用煙道の閉塞防止方法によれば、含硫排気ガス用煙道内に、排気ガス温度における飽和水蒸気量Gと、排気ガスの流量Vとの積によって算出される蒸発水量Wの20%以上の補給水を添加するため、煙道内に存在する吸収液のカルシウムの過飽和度を抑えることができ、煙道の内壁面に付着物が発生することを未然に防止することができる。   According to the method for preventing clogging of the sulfur-containing exhaust gas flue with this configuration, the evaporation calculated by the product of the saturated water vapor amount G at the exhaust gas temperature and the flow rate V of the exhaust gas in the sulfur-containing exhaust gas flue. Since makeup water of 20% or more of the amount of water W is added, the supersaturation degree of calcium in the absorption liquid existing in the flue can be suppressed, and the occurrence of deposits on the inner wall surface of the flue can be prevented in advance. Can do.

また、前記蒸発水量Wの100%以下の補給水を添加するため、添加した補給水のほとんどが煙道内で蒸発されることになり、煙道の下流側に位置する湿式脱硫装置の水バランスを崩すことがなく、湿式脱硫装置においてSOガスを効率良く吸収することができる。 In addition, since the makeup water of 100% or less of the amount of evaporated water W is added, most of the added makeup water is evaporated in the flue, and the water balance of the wet desulfurization device located downstream of the flue is increased. The SO 2 gas can be efficiently absorbed in the wet desulfurization apparatus without breaking down.

また、本発明に係る含硫排気ガス用煙道は、高温の含硫排気ガスを湿式脱硫工程を行う装置へと導くための含硫排気ガス用煙道であって、前記含硫排気ガス用煙道の入口には、前記湿式脱硫工程を行う装置の吸収液を前記含硫排気ガス用煙道内に供給する吸収液供給手段を備えた調湿部と、前記含硫排気ガス用煙道内に補給水を添加する補給水添加手段とが配置されるとともに、前記排気ガスの流量測定手段と、前記排気ガスの温度測定手段と、飽和水蒸気量を計算する計算手段とを有し、前記補給水水量が前記飽和水蒸気量の20%から100%の範囲内となるように、排気ガス流量、排気ガス温度、前記補給水水量のうちの少なくともひとつを調整する調整手段を備えたことを特徴としている。   In addition, the sulfur-containing exhaust gas flue according to the present invention is a sulfur-containing exhaust gas flue for guiding high-temperature sulfur-containing exhaust gas to an apparatus for performing a wet desulfurization process. At the inlet of the flue, a humidity control section having an absorbing liquid supply means for supplying the absorbing liquid of the apparatus for performing the wet desulfurization process into the sulfur-containing exhaust gas flue, and the sulfur-containing exhaust gas flue A makeup water adding means for adding makeup water is disposed, and has a flow rate measuring means for the exhaust gas, a temperature measuring means for the exhaust gas, and a calculating means for calculating a saturated water vapor amount. An adjusting means is provided for adjusting at least one of the exhaust gas flow rate, the exhaust gas temperature, and the makeup water amount so that the water amount falls within the range of 20% to 100% of the saturated water vapor amount. .

この構成の含硫排気ガス用煙道によれば、流量測定手段及び温度測定手段によって、排気ガスの流量及び温度を測定して、これらの測定値を用いて計算手段によって前記飽和水蒸気量を算出することができる。
また、補給水の水量がこの飽和水蒸気量の20%から100%の範囲内となるように、排気ガス流量、排気ガス温度、前記補給水水量のうちの少なくともひとつを調整する調整手段を備えているので、補給水の水量が必要以上に少なくなって煙道内に存在する吸収液中のカルシウムの過飽和度が高くなることを防止できるとともに、補給水の水量が必要以上に多くなって煙道の下流側に位置する湿式脱硫装置の水バランスを崩すことを防止できる。
According to the sulfur-containing exhaust gas flue having this configuration, the flow rate and temperature of the exhaust gas are measured by the flow rate measuring means and the temperature measuring means, and the saturated water vapor amount is calculated by the calculating means using these measured values. can do.
Further, an adjusting means is provided for adjusting at least one of the exhaust gas flow rate, the exhaust gas temperature, and the makeup water amount so that the makeup water amount falls within the range of 20% to 100% of the saturated water vapor amount. Therefore, it is possible to prevent the amount of makeup water from becoming smaller than necessary and preventing the supersaturation level of calcium in the absorption liquid in the flue from increasing, and the amount of makeup water from becoming larger than necessary. It is possible to prevent the water balance of the wet desulfurization apparatus located on the downstream side from being broken.

このように、本発明によれば、硫酸工場の吸収塔等から湿式脱硫装置へと含硫排気ガスを導く含硫排気ガス用煙道の内部に付着物が発生することを確実に防止できるとともに、湿式脱硫装置における水バランスを崩すことなくSOガスを効率的に吸収できる含硫排気ガス用煙道の閉塞防止方法及び含硫排気ガス用煙道を提供することができる。 As described above, according to the present invention, it is possible to reliably prevent the occurrence of deposits inside the flue for the sulfur-containing exhaust gas that guides the sulfur-containing exhaust gas from the absorption tower or the like of the sulfuric acid factory to the wet desulfurization apparatus. In addition, it is possible to provide a method for preventing clogging of a flue for a sulfur-containing exhaust gas and a flue for a sulfur-containing exhaust gas that can efficiently absorb SO 2 gas without breaking the water balance in the wet desulfurization apparatus.

以下に、本発明の実施形態について添付した図面を参照にして説明する。図1に本発明の実施形態である含硫排気ガス用煙道の概略を示す。
この含硫排気ガス用煙道10は、硫酸工場の吸収塔20から排出される含硫排気ガスを、湿式脱硫装置30へと導くためのものである。
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 schematically shows a flue for sulfur-containing exhaust gas according to an embodiment of the present invention.
The sulfur-containing exhaust gas flue 10 is for guiding the sulfur-containing exhaust gas discharged from the absorption tower 20 of the sulfuric acid factory to the wet desulfurization apparatus 30.

含硫排気ガス用煙道10の吸収塔20側の部分、つまり、含硫排気ガスの出口部分には、80℃以上の高温の含硫排気ガスに対して耐久性を有する鉄系材料にて構成された第1煙道11が配置されている。また、この第1煙道11の下流側に、繊維強化プラスチック(FRP)にて構成された第2煙道12が接続されている。   The portion of the sulfur-containing exhaust gas flue 10 on the absorption tower 20 side, that is, the outlet portion of the sulfur-containing exhaust gas, is made of an iron-based material having durability against high-temperature sulfur-containing exhaust gas of 80 ° C. or higher. A configured first flue 11 is arranged. A second flue 12 made of fiber reinforced plastic (FRP) is connected to the downstream side of the first flue 11.

第1煙道11と第2煙道12との接続部分に、高温の含硫排気ガスを冷却するための調湿部13が形成されている。この調湿部13にて使用される冷却水として、湿式脱硫装置30の吸収液が利用されており、この含硫排気ガス用煙道10には、湿式脱硫装置30の吸収液をくみ上げるポンプ14と、この吸収液を調湿部13へと導く送液配管15とが具備されている。   A humidity control section 13 for cooling the high-temperature sulfur-containing exhaust gas is formed at a connection portion between the first flue 11 and the second flue 12. As the cooling water used in the humidity control unit 13, the absorption liquid of the wet desulfurization apparatus 30 is used, and the pump 14 that pumps up the absorption liquid of the wet desulfurization apparatus 30 is used in the flue 10 for sulfur-containing exhaust gas. And a liquid delivery pipe 15 for guiding the absorption liquid to the humidity control unit 13.

そして、調湿部13に連通するように、含硫排気ガス用煙道10内に補給水として工業用水を供給するための補給水配管16が設けられている。この補給水配管16には、補給水量を調整する調整バルブ17が備えられており、含硫排気ガスの温度から求められる飽和水蒸気量Gと、含硫排気ガスの流量Vとの積によって算出される蒸発水量Wの20%から100%の範囲内の補給水を添加できるように構成されており、本実施形態においては、蒸発水量Wの50%から100%の範囲内の補給水を添加できるように構成されている。   And the supplementary water piping 16 for supplying industrial water as supplementary water in the flue 10 for sulfur-containing exhaust gas so that it may connect with the humidity control part 13 is provided. This make-up water pipe 16 is provided with an adjusting valve 17 for adjusting the make-up water amount, and is calculated by the product of the saturated water vapor amount G obtained from the temperature of the sulfur-containing exhaust gas and the flow rate V of the sulfur-containing exhaust gas. In this embodiment, makeup water within the range of 50% to 100% of the evaporated water amount W can be added. It is configured as follows.

湿式脱硫装置30では、図2に示す湿式脱硫方法によってSOガスが吸収される。まず、SOガスにAlとエアを送り込んで反応させてAl(SOとし、このAl(SOにCaCOスラリーを作用させることにより、SOガスをCaSO(石膏)として回収し、同時に生成したAlを再利用するものである。
したがって、この湿式脱硫装置30の吸収液の中には、CaCOスラリー由来のカルシウムイオンが含有されることになる。
In the wet desulfurization apparatus 30, SO 2 gas is absorbed by the wet desulfurization method shown in FIG. First, Al 2 O 3 and air are fed into SO 2 gas and reacted to form Al 2 (SO 4 ) 3, and a CaCO 3 slurry is allowed to act on this Al 2 (SO 4 ) 3 , thereby converting the SO 2 gas into CaSO 3. 4 (gypsum) is recovered and Al 2 O 3 produced at the same time is reused.
Therefore, calcium ions derived from the CaCO 3 slurry are contained in the absorption liquid of the wet desulfurization apparatus 30.

このような構成の含硫排気ガス用煙道10が、硫酸工場の吸収塔20と湿式脱硫装置30との間に配置される。吸収塔20から55〜80℃の含硫排気ガスがこの含硫排気ガス用煙道10へと供給される。調湿部13において湿式脱硫装置30の吸収液を吹き付けることにより、含硫排気ガスの温度は20〜27℃へと低下される。含硫排気ガスの20℃における飽和水蒸気量Gは19g/dryNmであり、27℃における飽和水蒸気量Gは29g/dryNmである。また、含硫排気ガスの流量Vは500〜2000dryNm/minの範囲内となるように設定されている。 The sulfur-containing exhaust gas flue 10 having such a configuration is disposed between the absorption tower 20 and the wet desulfurization apparatus 30 of the sulfuric acid factory. Sulfur-containing exhaust gas at 55 to 80 ° C. is supplied from the absorption tower 20 to the flue 10 for sulfur-containing exhaust gas. The temperature of the sulfur-containing exhaust gas is lowered to 20 to 27 ° C. by spraying the absorption liquid of the wet desulfurization device 30 in the humidity control unit 13. The saturated water vapor amount G at 20 ° C. of the sulfur-containing exhaust gas is 19 g / dryNm 3 , and the saturated water vapor amount G at 27 ° C. is 29 g / dryNm 3 . Further, the flow rate V of the sulfur-containing exhaust gas is set to be in the range of 500 to 2000 dryNm 3 / min.

例えば、含硫排気ガスの温度が20℃、含硫排気ガスの流量Vが500dryNm/minである場合における蒸発水量Wは、W=G×V=19g/dryNm×500dryNm/min=9500g/min=9.5l/minとなる。ここで、補給水量を蒸発水量の50%〜70%とした場合には、補給水として工業用水を添加する量は、4.75〜6.65l/minの範囲内で調整されることになる。 For example, when the temperature of the sulfur-containing exhaust gas is 20 ° C. and the flow rate V of the sulfur-containing exhaust gas is 500 dryNm 3 / min, the amount of evaporated water W is W = G × V = 19 g / dryNm 3 × 500 dryNm 3 / min = 9500 g /Min=9.5 l / min. Here, when the amount of makeup water is 50% to 70% of the amount of evaporated water, the amount of industrial water added as makeup water is adjusted within the range of 4.75 to 6.65 l / min. .

また、含硫排気ガスの温度が27℃、含硫排気ガスの流量Vが2000dryNm/minである場合における蒸発水量Wは、W=G×V=29g/dryNm×2000dryNm/min=58000g/min=58.0l/minとなる。ここで、補給水量を蒸発水量の50%〜100%とした場合には、補給水として工業用水を添加する量は、29.0〜58.0l/minの範囲内で調整されることになる。 Further, when the temperature of the sulfur-containing exhaust gas is 27 ° C. and the flow rate V of the sulfur-containing exhaust gas is 2000 dryNm 3 / min, the amount of evaporated water W is W = G × V = 29 g / dryNm 3 × 2000 dryNm 3 / min = 58000 g. /Min=58.0 l / min. Here, when the amount of makeup water is 50% to 100% of the amount of evaporated water, the amount of industrial water added as makeup water is adjusted within the range of 29.0 to 58.0 l / min. .

このように工業用水を含硫排気ガス用煙道10内に添加することにより、SOガス煙道10内に存在する吸収液のカルシウムの過飽和度を抑えることができ、含硫排気ガス用煙道10の内壁面に付着物が発生することを未然に防止することができる。また、添加した工業用水のほとんどが含硫排気ガス用煙道10内で蒸発され、含硫排気ガス用煙道10の下流側に位置する湿式脱硫装置30の水バランスを崩すことがない。したがって、湿式脱硫装置30におけるSOガスの吸収効率を劣化させることがなく、SOガスの処理能力を高く維持することができる。 Thus, by adding industrial water into the sulfur-containing exhaust gas flue 10, the supersaturation degree of the calcium in the absorbent existing in the SO 2 gas flue 10 can be suppressed, and the sulfur-containing exhaust gas smoke It is possible to prevent the deposits from being generated on the inner wall surface of the road 10. Further, most of the added industrial water is evaporated in the sulfur-containing exhaust gas flue 10, and the water balance of the wet desulfurization device 30 located downstream of the sulfur-containing exhaust gas flue 10 is not lost. Accordingly, the SO 2 gas absorption efficiency in the wet desulfurization apparatus 30 is not degraded, and the SO 2 gas processing capacity can be maintained high.

以上、本発明の実施形態である含硫排気ガス用煙道について説明したが、本発明はこれに限定されることはなく、その発明の技術的思想を逸脱しない範囲で適宜変更可能である。
例えば、含硫排気ガス用煙道10内に供給する補給水として工業用水を利用するものとして説明したが、これに限定されることはなく、他の水源から補給水を確保してもよい。ただし、この補給水としては、カルシウムイオンの濃度が低いものを用いることが好ましい。
As mentioned above, although the flue for sulfur-containing exhaust gas which is embodiment of this invention was demonstrated, this invention is not limited to this, In the range which does not deviate from the technical idea of the invention, it can change suitably.
For example, although it has been described that industrial water is used as makeup water supplied into the flue 10 for sulfur-containing exhaust gas, the present invention is not limited to this, and makeup water may be secured from other water sources. However, it is preferable to use the makeup water having a low calcium ion concentration.

また、本実施形態では、含硫排気ガスの温度、流量を一定範囲内に制御して、これに併せて補給水の水量を調整するものとして説明したが、含硫排気ガスの温度、含硫排気ガスの流量、補給水の水量のうちの少なくともひとつを調整するように構成されていればよく、これらのうちの2つ以上を調整するものであってもよい。   In the present embodiment, the temperature and flow rate of the sulfur-containing exhaust gas are controlled within a certain range, and the amount of makeup water is adjusted accordingly. However, the temperature and sulfur content of the sulfur-containing exhaust gas are adjusted. It may be configured to adjust at least one of the flow rate of exhaust gas and the amount of makeup water, and two or more of these may be adjusted.

本発明の実施形態である含硫排気ガス用煙道を示す説明図である。It is explanatory drawing which shows the flue for sulfur containing exhaust gas which is embodiment of this invention. 図1中に示す湿式脱硫装置において実施される湿式脱硫方法の一例を示す模式図である。It is a schematic diagram which shows an example of the wet desulfurization method implemented in the wet desulfurization apparatus shown in FIG.

符号の説明Explanation of symbols

10 含硫排気ガス用煙道
13 調湿部
15 送液配管(吸収液供給手段)
16 補給水配管(補給水添加手段)
17 調整バルブ(調整手段)
30 湿式脱硫装置
10 Sulfur-containing exhaust gas flue 13 Humidity control section 15 Liquid supply piping (absorbing liquid supply means)
16 Supply water piping (Supply water addition means)
17 Adjustment valve (Adjustment means)
30 Wet desulfurization equipment

Claims (2)

高温の排気ガスを湿式脱硫工程を行う装置へと導く煙道の入口に、前記湿式脱硫工程を行う装置からの吸収液を吹き付けて前記排気ガスの温度を低下させる調湿部を有する含硫排気ガス用煙道の閉塞防止方法であって、
前記含硫排気ガス用煙道を流通する前記排気ガス温度における飽和水蒸気量Gと、前記排気ガスの流量Vとを乗積することにより蒸発水量Wを算出し、
前記含硫排気ガス用煙道に、前記蒸発水量Wの20%から100%の範囲内の補給水を添加することを特徴とする含硫排気ガス用煙道の閉塞防止方法。
Sulfur-containing exhaust having a humidity control section that lowers the temperature of the exhaust gas by spraying an absorption liquid from the apparatus that performs the wet desulfurization process on the inlet of the flue leading the high-temperature exhaust gas to the apparatus that performs the wet desulfurization process A gas flue blockage prevention method comprising:
Evaporating water amount W is calculated by multiplying the saturated water vapor amount G at the exhaust gas temperature flowing through the sulfur-containing exhaust gas flue and the flow rate V of the exhaust gas,
A method for preventing clogging of a flue for a sulfur-containing exhaust gas, wherein makeup water within a range of 20% to 100% of the amount of evaporated water W is added to the flue for a sulfur-containing exhaust gas.
高温の排気ガスを湿式脱硫工程を行う装置へと導くための含硫排気ガス用煙道であって、
前記含硫排気ガス用煙道の入口には、前記湿式脱硫工程を行う装置の吸収液を前記含硫排気ガス用煙道内に供給する吸収液供給手段を備えた調湿部と、前記含硫排気ガス用煙道内に補給水を添加する補給水添加手段とが配置されるとともに、
前記排気ガスの流量測定手段と、前記排気ガスの温度測定手段と、飽和水蒸気量を計算する計算手段とを有し、
前記補給水の水量が、前記飽和水蒸気量の20%から100%の範囲内となるように、排気ガス流量、排気ガス温度、前記補給水水量のうちの少なくともひとつを調整する調整手段を備えたことを特徴とする含硫排気ガス用煙道。
A flue for sulfur-containing exhaust gas for guiding high-temperature exhaust gas to an apparatus for performing a wet desulfurization process,
At the inlet of the sulfur-containing exhaust gas flue, a humidity control unit comprising an absorption liquid supply means for supplying the absorption liquid of the apparatus for performing the wet desulfurization process into the sulfur-containing exhaust gas flue; A makeup water addition means for adding makeup water to the exhaust gas flue is disposed,
The exhaust gas flow rate measurement means, the exhaust gas temperature measurement means, and a calculation means for calculating a saturated water vapor amount,
Adjusting means for adjusting at least one of the exhaust gas flow rate, the exhaust gas temperature, and the amount of makeup water so that the amount of makeup water falls within the range of 20% to 100% of the amount of saturated water vapor. A flue for sulfur-containing exhaust gas, characterized by that.
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JPH04300627A (en) * 1991-03-29 1992-10-23 Mitsubishi Materials Corp Method for preventing clogging of flue
JPH06134251A (en) * 1992-10-22 1994-05-17 Chiyoda Corp Reducing method for make-up water to wet desulfurization device
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Publication number Priority date Publication date Assignee Title
WO2012153838A1 (en) * 2011-05-12 2012-11-15 三菱重工メカトロシステムズ株式会社 Exhaust gas treatment method and exhaust gas treatment device
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