KR20030053331A - Wet Scrubbing method of dust, sulfur oxides and nitrogen oxides from flue gas - Google Patents

Wet Scrubbing method of dust, sulfur oxides and nitrogen oxides from flue gas Download PDF

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KR20030053331A
KR20030053331A KR1020010083510A KR20010083510A KR20030053331A KR 20030053331 A KR20030053331 A KR 20030053331A KR 1020010083510 A KR1020010083510 A KR 1020010083510A KR 20010083510 A KR20010083510 A KR 20010083510A KR 20030053331 A KR20030053331 A KR 20030053331A
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dust
naoh
wet
oxides
nitrogen oxides
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KR1020010083510A
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Korean (ko)
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한석천
김종재
김영민
이상민
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주식회사 포스코
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact

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  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)

Abstract

PURPOSE: A wet type removal method is provided which is capable of removing sulfur oxides and nitrogen oxides by using NaClO2 as oxidizer of NO and appropriately mixing Na2SO3 and NaOH solution in removing dust by using wet scrubber. CONSTITUTION: In a wet type scrubber process for removing dust contained flue gas using absorption solution, the wet type removal method is characterized in that dust, sulfur oxides and nitrogen oxides are removed by using an absorption solution comprising 1.5 to 5.0 wt.% of NaClO2, 1.5 to 5.0 wt.% of Na2SO3, 1.0 to 2.0 wt.% of NaOH and a balance of water, wherein reaction temperature is controlled to 40 to 60 deg.C in the wet type scrubber process, wherein dust as well as sulfur oxides and nitrogen oxides are effectively removed by using an absorption solution in which NaClO2, Na2SO3 and NaOH are appropriately mixed in the wet type scrubber process for removing dust contained in flue gas.

Description

배가스에 함유된 먼지, 황산화물 및 질소산화물의 습식제거방법{Wet Scrubbing method of dust, sulfur oxides and nitrogen oxides from flue gas}Wet Scrubbing method of dust, sulfur oxides and nitrogen oxides from flue gas}

본 발명은 배기가스중에 포함되어 배출되는 먼지, 황산화물(SOx) 및 질소산화물(NOx)을 제거하는 방법에 관한 것으로, 보다 상세하게는, 배가스중의 먼지를 제거하는 공정으로 사용되는 습식 스크러버(Scrubber)에서 세정액으로 사용되는 물에 NaClO2와 Na2SO3및 NaOH를 첨가하고 온도조건을 제어함으로써 먼지 뿐만 아니라 황산화물과 질소산화물을 동시에 제거하는 방법에 관한 것이다.The present invention relates to a method for removing dust, sulfur oxides (SOx) and nitrogen oxides (NOx) contained in exhaust gas, and more particularly, a wet scrubber used in a process for removing dust in exhaust gas. The present invention relates to a method of simultaneously removing sulfur oxides and nitrogen oxides as well as dust by adding NaClO 2 , Na 2 SO 3 and NaOH to water used as a washing liquid in a scrubber) and controlling temperature conditions.

일반적으로 배기가스에 함유된 먼지를 제거하기 위하여 전기집진기나 Bag Filter 집진기, 혹은 스크러버 형태의 습식집진기등이 사용된다. 특히, 습식 스크러버에서는 물을 분사하여 배가스중의 먼지를 응집시켜 먼지를 제거하게 된다.In general, an electrostatic precipitator, a bag filter dust collector, or a scrubber type wet dust collector is used to remove dust contained in exhaust gas. In particular, the wet scrubber is sprayed with water to agglomerate dust in the exhaust gas to remove dust.

한편 배가스중의 황산화물은 주로 알카리 용액을 사용한 습식공정으로 제거되는데, 주로 Ca(OH)2, MgOH, NaOH와 같은 알카리 용액이 세정액으로 사용된다. NaOH를 세정액으로 사용한 경우, 다음과 같은 반응에 의해 SOx가 제거된다.[A. L.Kohl and R. B. Nielsen, "Gas purification", 5thedition, Gulf Publishing Company, Texas, 1997, p.466]On the other hand, sulfur oxides in the flue-gas is mainly removed by a wet process using an alkaline solution, mainly alkaline solutions such as Ca (OH) 2 , MgOH, NaOH is used as the cleaning solution. When NaOH was used as the cleaning solution, SOx was removed by the following reaction. [ALKohl and RB Nielsen, "Gas purification", 5 th edition, Gulf Publishing Company, Texas, 1997, p.466]

2NaOH + SO2→Na2SO3+ H2O2NaOH + SO 2 → Na 2 SO 3 + H 2 O

Na2SO3+ SO2+ H2O → 2NaHSO3 Na 2 SO 3 + SO 2 + H 2 O → 2 NaHSO 3

한편, NOx를 제거하는 방법은 건식공정과 습식공정으로 크게 나누어진다. 이중 습식공정은 질산 제조설비나 금속의 산세공정 등에서 발생하는 배기가스중의 NOx를 제거하는데 많이 사용되고 있으며, 이들 공정에서 발생하는 NOx는 물에 잘 녹아 제거가 쉽게되는 이산화질소(NO2)를 많이 포함하고 있기 때문이다.On the other hand, the method of removing NOx is largely divided into dry process and wet process. The double wet process is widely used to remove NOx from exhaust gases generated in nitric acid manufacturing facilities or metal pickling processes, and the NOx generated in these processes contains a lot of nitrogen dioxide (NO 2 ) that is easily dissolved in water and easily removed. Because it is.

이와 같은 습식 세정공정에서는 주로 NaOH나 Na2S 등과 같은 알카리 용액을 사용하여 배기가스중의 NOx를 제거하는데, 다음과 같은 반응들에 의해 NOx가 제거된다.In this wet cleaning process, an alkali solution such as NaOH or Na 2 S is used to remove NOx in the exhaust gas, and NOx is removed by the following reactions.

2NaOH + 2NO2→ NaNO2+ NaNO3+ H2O2NaOH + 2NO 2 → NaNO 2 + NaNO 3 + H 2 O

Na2S + 2NO2→ Na2SO3+ N2+ 1/2O2 Na 2 S + 2 NO 2 → Na 2 SO 3 + N 2 + 1/2 O 2

NO + 1/2O2→ NO2 NO + 1 / 2O 2 → NO 2

따라서, 습식공정에서 세정액으로 NaOH와 같은 알카리를 사용하면 위와 같은화학식들에 의해 SOx와 NOx를 동시에 제거할 수도 있다.Therefore, when alkali such as NaOH is used as the cleaning solution in the wet process, SOx and NOx may be simultaneously removed by the above formulas.

그러나, NOx중의 많은 부분을 차지하는 일산화질소(NO)의 경우 물에 대한 용해도가 낮아 물에 잘 용해되지 않고, 산소와의 산화반응에 의해 NO2로 산화되는 정도가 매우 낮기 때문에 NOx중에 NO의 함량이 높을 경우 제거효율이 떨어지게 된다. 특히, 연소과정에서 발생하는 NOx의 경우 NO가 대부분을 차지하기 때문에 습식공정의 사용이 어렵다.However, in the case of nitrogen monoxide (NO), which accounts for much of the NOx because of lower solubility in water is not very soluble in water, it has a very low degree of oxidation to NO 2 by the oxidation reaction with the oxygen content of NO in the NOx If this is high, the removal efficiency is reduced. In particular, in the case of NOx generated during the combustion process, since NO occupies most, it is difficult to use a wet process.

따라서 이러한 NOx 제거를 위한 습식 세정공정의 문제점을 해결하기 위한 방법들이 제안되어 왔는데, 예를 들어 공지문헌 "Industrial & Engineering Chemistry : Process Design and Development, Vol.22, No.2, pp.323-329, 1983"는 산화제인 KMnO4를 NaOH 용액에 같이 사용하여 NO를 물에 용해가 잘되는 NO2나 NO3로 산화시킴으로써 NOx 제거효율을 높일 수 있음을 나타내고 있다. 그러나, 이 방법에서는 반응과정에서 고형의 MnO2가 일부 생성되기 때문에 세정탑이 막히는 문제점이 생기게 된다.Therefore, methods for solving the problem of the wet cleaning process for removing NOx have been proposed, for example, the publication "Industrial & Engineering Chemistry: Process Design and Development, Vol. 22, No. 2, pp.323-329". , 1983 "indicates that the NOx removal efficiency can be improved by oxidizing NO into NO 2 or NO 3 which is soluble in water by using KMnO 4 as an oxidizing agent in a NaOH solution. However, this method causes a problem that the washing tower is clogged because some solid MnO 2 is generated during the reaction.

또한 산화제인 NaClO2를 사용하여 NO 제거효율을 높이는 방법이 알려져 있는데, 공지문헌 "Chem. Eng. Comm., vol.174, pp21-51, 1999"에서는 NaClO2와 NaOH를 혼합한 흡수액을 이용하여 NO를 제거하는 방법에 대해 제시되어 있다. 그러나 이경우 NO는 효과적으로 제거되지만, 일부 NO가 NO2로 산화되어 흡수액에서 제거되지 않고 배출되는 단점이 있으며 SOx 제거에 대한 조건이 기술이 되어 있지 않아 미반응 SOx가 배가스에 포함되어 대기중으로 배출된다는 문제점이 있다.In addition, a method of increasing the NO removal efficiency by using an oxidizing agent NaClO 2 is known. In the known document "Chem. Eng. Comm., Vol.174, pp21-51, 1999", an absorbent liquid containing NaClO 2 and NaOH is used. A method for removing NO is presented. In this case, however, NO is effectively removed, but some of the NO is oxidized to NO 2 and is not removed from the absorbent liquid.It is discharged and the conditions for SOx removal are not described, so unreacted SOx is discharged into the atmosphere as it is included in the exhaust gas. There is this.

따라서 본 발명은 상술한 종래기술의 문제를 해결하기 위한 것으로, 습식 스크러버를 이용하여 먼지를 제거하는 공정에 있어서, NO의 산화제로 NaClO2를 사용하고, Na2SO3와 NaOH 용액을 적정량 혼합사용함으로써 질소산화물 및 황산화물을 제거할 수 있는 습식제거방법을 제공함을 그 목적으로 한다.Accordingly, the present invention is to solve the above-mentioned problems of the prior art, in the process of removing dust using a wet scrubber, using NaClO 2 as the oxidizing agent of NO, mixed Na 2 SO 3 and NaOH solution with an appropriate amount It is an object of the present invention to provide a wet removal method capable of removing nitrogen oxides and sulfur oxides.

따라서 본 발명은, 배가스중 먼지등을 흡수액으로 제거하는 습식 스크러버 공정에 있어서, 중량%로, NaClO21.5~5.0%, Na2SO31.5~ 5.0%, NaOH:1.0~2.0%, 및 잔여 물로 이루어진 흡수액을 사용하여 먼지, 황산화물 및 질소산화물을 제거하는 것을 특징으로 하는 습식제거방법에 관한 것이다.Therefore, the present invention, in the wet scrubber process to remove the dust and the like in the flue gas by the absorbent liquid, in weight%, NaClO 2 1.5 ~ 5.0%, Na 2 SO 3 1.5 ~ 5.0%, NaOH: 1.0 ~ 2.0%, and residual water The present invention relates to a wet removal method comprising removing dust, sulfur oxides and nitrogen oxides using an absorbent solution.

이하, 본 발명을 설명한다.Hereinafter, the present invention will be described.

본 발명은 스크러버의 세정액에 흡수제로 NaClO2와 Na2SO3및 NaOH 용액을 혼합 사용하여 배기가스중의 먼지, 질소산화물 및 황산화물을 동시에 제거하는 방법을 제공한다.The present invention provides a method of simultaneously removing the dust, nitrogen oxides and sulfur oxides in the exhaust gas by using a mixture of NaClO 2 and Na 2 SO 3 and NaOH as an absorbent in the scrubber cleaning solution.

즉, 본 발명에서는 먼지를 제거하는 습식 스크러버에 NaClO2와 Na2SO3및 NaOH를 혼합한 용액을 흡수제로 사용하므로써, 종래 단순히 NaClO2와 NaOH를 혼합한 세정액을 사용할때 보다 NO의 산화에 의해 발생된 NO2가 제거되지 않고 배출되는 단점이 개선될 뿐만 아니라 SOx까지 동시에 제거된다.That is, in the present invention, by using a solution of NaClO 2 and Na 2 SO 3 and NaOH in the wet scrubber to remove the dust as an absorbent, by the oxidation of NO than conventionally simply using a cleaning solution mixed with NaClO 2 and NaOH Not only is the disadvantage that the generated NO 2 is released without being removed, but also SOx is removed at the same time.

상세하게 설명하면, 본 발명의 방법에서 NaClO2는 강산화제로 NO와 반응하여 질산을 생성하거나 NO를 NO2로 산화시킨다.Specifically, in the method of the present invention, NaClO 2 reacts with NO as a strong oxidant to produce nitric acid or oxidize NO to NO 2 .

NO + 3NaClO2+ 2H2O → 4HNO3+ 3NaClNO + 3 NaClO 2 + 2H 2 O → 4HNO 3 + 3NaCl

2NO + NaClO2→ 2NO2+ NaCl2NO + NaClO 2 → 2NO 2 + NaCl

그리고 Na2SO3는 다음과 같은 반응에 의해 NO2를 제거하는 역할을 한다.And Na 2 SO 3 serves to remove NO 2 by the following reaction.

2NO2+ Na2SO3→ Na2SO4+ N2+ 3/2O2 2NO 2 + Na 2 SO 3 → Na 2 SO 4 + N 2 + 3 / 2O 2

또한, Na2SO3는 상기 반응식 1에 의해서 SOx를 제거하는 역할도 한다.In addition, Na 2 SO 3 also serves to remove SOx by the above Scheme 1.

한편, 상기 흡수액에 사용되는 NaOH는 SOx를 제거하는 역할을 할 뿐만 아니라 흡수액의 pH를 유지하기 위해 사용되는데, NOx가 흡수액에 흡수되어 제거됨에 따라 질산이 생생되어 pH가 떨어지면 NaClO2등이 분해되어 효율이 떨어지기 때문이다.On the other hand, NaOH used in the absorbent liquid not only serves to remove SOx but also to maintain the pH of the absorbent liquid. As NOx is absorbed and removed by the absorbent liquid, nitric acid is generated and NaClO 2 is decomposed when the pH drops. This is because efficiency decreases.

본 발명에서는 이러한 흡수액이, 중량%로, NaClO21.5~5.0%, Na2SO31.5~5.0%, NaOH:1.0~2.0%, 및 잔여 물을 포함하여 조성되도록 제한한다.In the present invention, such an absorbent liquid is limited to a weight%, NaClO 2 1.5 to 5.0%, Na 2 SO 3 1.5 to 5.0%, NaOH: 1.0 to 2.0%, and the composition to include the residual water.

왜냐하면 만일 NaClO2, Na2SO3및 NaOH 함량이 본 발명범위를 초과하면 배가스중 SOx 제거효율이 다소 떨어지며, 본 발명범위 미만이면 NOx 및 SOx의 전체적인 제거효율이 현격히 떨어지기 때문이다.If NaClO 2 , Na 2 SO 3 and NaOH content exceeds the scope of the present invention, SOx removal efficiency in the flue gas is somewhat reduced, if less than the scope of the present invention because the overall removal efficiency of NOx and SOx is significantly reduced.

또한 본 발명은, 배기가스중에 함유된 먼지등을 제거하기 위하여 상기 조성의 흡수액을 사용할때, 그 반응온도를 40~60℃로 제한함이 바람직하다. 왜냐하면 그 반응온도가 60℃를 초과하면 SOx 제거효율은 양호한 편이나 NOx 제거효율이 좋지 않으며, 40℃미만에서는 SOx 제거효율이 좋지 않기 때문이다.In addition, the present invention, when using the absorbent liquid of the above composition to remove the dust and the like contained in the exhaust gas, it is preferable to limit the reaction temperature to 40 ~ 60 ℃. Because if the reaction temperature exceeds 60 ℃ SOx removal efficiency is good but NOx removal efficiency is not good, but below 40 ℃ SOx removal efficiency is not good.

이하, 본 발명의 실시예를 통하여 보다 상세히 설명한다.Hereinafter, the embodiment of the present invention will be described in more detail.

[실시예 1]Example 1

질소산화물과 황산화물의 제거효과를 측정하기 위하여 공기에 NO가 790~815 ppm, SO2가 385~415ppm, 먼지가 485~520㎎/S㎥ 혼합된 가스를 2 liter/min의 유량으로 표 1과 같이 그 조성을 달리하는 흡수액이 1 liter들어있는 컬럼에 버블링(bubbling)하면서 통과시켜 제거효율을 측정하였다. 이때 반응온도를 50±2℃로 제어하였다.In order to measure the removal effect of nitrogen oxide and sulfur oxide, the gas mixed with 790 ~ 815 ppm of NO, 385 ~ 415ppm of SO 2 , and 485 ~ 520mg / S㎥ of dust was used at the flow rate of 2 liter / min. As described above, the removal efficiency of the absorbent liquid having different composition was passed through the column containing 1 liter while bubbling. At this time, the reaction temperature was controlled to 50 ± 2 ℃.

이러한 반응개시 1시간후 흡수컬럼 출구에서 NO, NO2및 SO2농도를 측정하여 표 1에 나타내었으며, 아울러 이러한 출구측 농도들을 칼럼 입구측 농도들와 비교하여 그 제거율을 평가하여 표 1에 나타내었다.One hour after the start of the reaction, the concentrations of NO, NO 2 and SO 2 at the outlet of the absorption column were measured and shown in Table 1, and these outlet concentrations were compared with the column inlet concentrations to evaluate their removal rates. .

흡수액 조성(중량%)Absorption liquid composition (wt%) 입구농도(ppm)Inlet concentration (ppm) 출구측농도(ppm)Outlet Side Concentration (ppm) NOx제거율(%)NOx removal rate (%) SOx제거율(%)SOx removal rate (%) NaClO2 NaClO 2 Na2SO3 Na 2 SO 3 NaOHNaOH H2OH 2 O NONO SO2 SO 2 먼지dust NONO NO2 NO 2 SO2 SO 2 먼지dust 비교예1Comparative Example 1 77 77 55 8181 810810 400400 500500 00 4040 2020 99 95.295.2 95.095.0 비교예2Comparative Example 2 66 66 44 8484 805805 390390 490490 00 3939 1212 1010 95.295.2 97.097.0 발명예1Inventive Example 1 55 55 33 8787 790790 410410 520520 00 3838 88 1212 95.295.2 98.098.0 발명예2Inventive Example 2 44 44 22 9090 796796 402402 513513 00 4040 77 1010 95.095.0 98.298.2 발명예3Inventive Example 3 33 33 22 9292 800800 405405 496496 00 4040 66 88 95.095.0 98.598.5 발명예4Inventive Example 4 22 22 1.51.5 94.594.5 790790 415415 485485 00 4242 77 99 94.794.7 98.398.3 발명예5Inventive Example 5 1.51.5 1.51.5 1.01.0 96.96. 815815 395395 510510 00 3535 66 1010 95.795.7 98.598.5 비교예3Comparative Example 3 1.01.0 1.01.0 0.50.5 97.597.5 800800 385385 500500 2222 4545 88 88 91.691.6 97.997.9 비교예4Comparative Example 4 0.50.5 0.50.5 00 9999 792792 396396 490490 7070 5656 2424 77 84.184.1 93.993.9

표 1에 나타난 바와 같이, NaClO2, Na2SO3및 NaOH 농도가 적정하게 제어된 본 발명예(1~5)은 모두 NOx와 SOx의 제거효율이 우수하였다.As shown in Table 1, Examples 1 to 5 of the present invention (1 to 5) in which NaClO 2 , Na 2 SO 3 and NaOH concentration were properly controlled were excellent in NOx and SOx removal efficiency.

이에 대하여, NaClO2, Na2SO3및 NaOH 농도가 본 발명범위보다 높은 비교예 (1~2)는 NOx의 제거효율은 양호하나 SOx 제거효율이 상대적으로 떨어졌으며, 그 농도가 너무 낮은 비교예(3~4)은 본 발명예 대비 NOx 및 SOx 제거효율이 약 10%까지 나빠짐을 일 수 있다.On the contrary, Comparative Examples (1 to 2) in which NaClO 2 , Na 2 SO 3 and NaOH concentrations are higher than the range of the present invention have good removal efficiency of NOx but relatively low SOx removal efficiency, and the concentration is too low. (3 to 4) may be up to about 10% of the NOx and SOx removal efficiency compared to the present invention.

[실시예 2]Example 2

중량%로, NaClO22.0%, Na2SO32.0%, NaOH:1%, 및 잔여 물을 포함하여 조성된 흡수액을 마련한 후, 이를 벤츄리 형태의 스크러버에 장입하였다. 그리고 먼지와 황산화물, 질소산화물의 동시 제거함에 있어서 흡수액 반응온도의 영향을 알아보기 위해, 배가스를 120ℓ/hr유량으로 스크러버에 공급하였으며, 이 배가스에는 먼지는 485~520mg/Sm3, NO는 790~815ppm, SO2는 385~410 ppm 포함하고 있었다.By weight, an absorbent liquid comprising 2.0% NaClO 2, 2.0% Na 2 SO 3 , NaOH: 1%, and residual water was prepared, and then charged into a venturi-type scrubber. In order to examine the effect of absorbent reaction temperature on the simultaneous removal of dust, sulfur oxides and nitrogen oxides, flue gas was supplied to the scrubber at a flow rate of 120 l / hr, which contained 485 to 520 mg / Sm 3 and NO was 790. 815 ppm and SO 2 contained 385 to 410 ppm.

표 2와 같이, 스크러버 공정에서의 반응온도를 달리하면서 반응을 계속한후, 스크러버내 흡수칼럼 입구측 및 출구측 NO, SO2농도등을 측정하여 표 2에 나타내었으며, 아울러 아울러 이러한 출구측 농도들을 칼럼 입구측 농도들와 비교하여 그 제거율을 평가하여 표 2에 나타내었다.As shown in Table 2, after the reaction was continued while varying the reaction temperature in the scrubber process, the concentration of NO and SO 2 at the absorption column inlet and outlet in the scrubber was measured and shown in Table 2, and at the same time, the outlet concentration was measured. The removal rate was compared to the column inlet concentrations, and the removal rate thereof was shown in Table 2.

온도(℃)Temperature (℃) 입구농도(ppm)Inlet concentration (ppm) 출구농도(ppm)Outlet concentration (ppm) NOx제거율(%)NOx removal rate (%) SOx제거율(%)SOx removal rate (%) NONO SO2 SO 2 먼지dust NONO NO2 NO 2 SO2 SO 2 먼지dust 비교예1Comparative Example 1 7575 796796 402402 513513 00 4040 77 1010 95.095.0 98.298.2 비교예2Comparative Example 2 7070 800800 385385 500500 2222 4545 88 88 91.691.6 97.997.9 발명예1Inventive Example 1 6060 800800 405405 496496 00 4040 66 88 95.095.0 98.598.5 발명예2Inventive Example 2 5050 790790 415415 485485 00 4242 77 99 94.794.7 98.398.3 발명예3Inventive Example 3 4040 815815 395395 510510 00 3535 66 1010 95.795.7 98.598.5 비교예3Comparative Example 3 3030 810810 400400 500500 00 4040 2020 99 95.195.1 95.095.0 비교예4Comparative Example 4 2020 805805 390390 490490 00 3939 1212 1010 95.295.2 97.097.0 비교예5Comparative Example 5 1515 790790 410410 520520 00 3838 88 1212 95.295.2 98.098.0

표 2에 나타난 바와 같이, 흡수액의 반응온도가 40~60℃로 제어된 본 발명예(1~3)의 경우 모두 NOx와 SOx의 제거효율이 우수하였다.As shown in Table 2, in the case of the present invention examples (1 to 3) in which the reaction temperature of the absorbent liquid was controlled to 40 ~ 60 ℃, the removal efficiency of NOx and SOx was excellent.

이에 대하여, 흡수액의 반응온도가 60℃를 초과하는 비교예(1~2)는 SOx의 제거효율은 양호하나 NOx 제거효율이 좋지 않으며, 또한 그 반응온도가 40℃미만인 비교예(3~5)는 NOx 제거효율 양호하나 SOx의 제거효율이 좋지 않았다.On the other hand, Comparative Examples (1 to 2) in which the reaction temperature of the absorbent liquid exceeds 60 ° C. have good removal efficiency of SOx but poor NOx removal efficiency, and Comparative Examples (3 to 5) whose reaction temperature is less than 40 ° C. NOx removal efficiency was good, but SOx removal efficiency was not good.

상술한 바와 같이, 본 발명은, 배가스중의 먼지를 제거하는 습식 스크러버에 NaClO2, Na2SO3및 NaOH가 적정량 혼합된 흡수액을 사용함으로써 먼지뿐만 아니라 황산화물과 질소산화물을 효과적으로 제거할 수 있다.As described above, the present invention can effectively remove not only dust but also sulfur oxides and nitrogen oxides by using an absorbent liquid in which NaClO 2 , Na 2 SO 3 and NaOH are mixed in a wet scrubber for removing dust in exhaust gas. .

Claims (2)

배가스중 먼지등을 흡수액으로 제거하는 습식 스크러버 공정에 있어서,In the wet scrubber process of removing dust in the exhaust gas with an absorbent liquid, 중량%로, NaClO21.5~5.0%, Na2SO31.5~ 5.0%, NaOH:1.0~2.0%, 및 잔여 물로 이루어진 흡수액을 사용하여 먼지, 황산화물 및 질소산화물을 제거하는 것을 특징으로 하는 습식제거방법.By weight, wet, characterized in that to remove dust, sulfur oxides and nitrogen oxides using an absorbent solution consisting of NaClO 2 1.5 ~ 5.0%, Na 2 SO 3 1.5 ~ 5.0%, NaOH: 1.0 ~ 2.0%, and the residual water. How to remove. 제 1항에 있어서, 상기 습식 스크러버 공정에서 반응온도를 40~60℃로 제어함을 특징으로 하는 습식제거방법.The method of claim 1, wherein the wet scrubber process in the wet removal method characterized in that the reaction temperature is controlled to 40 ~ 60 ℃.
KR1020010083510A 2001-12-22 2001-12-22 Wet Scrubbing method of dust, sulfur oxides and nitrogen oxides from flue gas KR20030053331A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160069539A (en) 2014-12-08 2016-06-17 (주) 테크윈 Wet gas cleaning system using oxidizing agent produced from the wastewater

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