KR100470658B1 - A facilities for refining waste acid and its refining method - Google Patents

A facilities for refining waste acid and its refining method Download PDF

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KR100470658B1
KR100470658B1 KR10-2000-0079601A KR20000079601A KR100470658B1 KR 100470658 B1 KR100470658 B1 KR 100470658B1 KR 20000079601 A KR20000079601 A KR 20000079601A KR 100470658 B1 KR100470658 B1 KR 100470658B1
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gas
neutralizing
hcl
cooling water
hydrochloric acid
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KR10-2000-0079601A
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KR20020050452A (en
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이준석
방정희
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주식회사 포스코
재단법인 포항산업과학연구원
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/14Separation 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 by absorption
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23GCLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36Regeneration of waste pickling liquors

Abstract

폐염산 회수장치 및 이를 이용한 폐염산 회수방법이 제공된다.A waste hydrochloric acid recovery apparatus and a waste hydrochloric acid recovery method using the same are provided.

본 발명은, 액상의 염화철을 산화철과 Cl2가스로 열분해시키는 배소로(210)와, 상기 배소로 (210)로부터 배출된 Cl2가스를 HCl수용액으로 회수하는 흡수탑 (230), 그리고 중화액을 공급하는 순환관(251)이 형성되어 있으며, 상기 흡수탑(230)에서 미회수된 HCl가스를 중화액으로 중화시켜 제거하는 충진층(253)이 형성되어 있는 세정탑 (250)을 포함하는 폐염산 회수장치에 있어서,The present invention provides a roasting furnace 210 for pyrolyzing liquid iron chloride into iron oxide and Cl 2 gas, an absorption tower 230 for recovering Cl 2 gas discharged from the roasting furnace 210 with an aqueous HCl solution, and a neutralizing solution. Circulation tube 251 for supplying the gas is formed, and the cleaning tower 250 includes a filling layer 253 for neutralizing and removing the unrecovered HCl gas from the absorption tower 230 by neutralization liquid. In the waste hydrochloric acid recovery apparatus,

상기 세정탑(250)으로 공급되는 중화액의 온도를 낮출 수 있도록 상기 순환관(251)상에 형성된 열교환기(255); 상기 열교환기(255)로 부터 배출된 승온된 냉각수를 다시 상온으로 냉각시키는 냉각기(256); 상기 냉각기에서 냉각된 냉각수를 다시 상기 열교환기에 공급하도록 하는 냉각수펌프(257); 및 상기 냉각기(256)에 냉각수 를 보충하는 냉각수저장조(258);로 구성된 냉각설비를 포함하여 구성된 폐염산 회수장치 및 이를 이용한 폐염산 회수방법에 관한 것이다. A heat exchanger 255 formed on the circulation pipe 251 to lower the temperature of the neutralizing liquid supplied to the washing tower 250; A cooler (256) for cooling the heated coolant discharged from the heat exchanger (255) back to room temperature; A cooling water pump 257 for supplying the cooling water cooled by the cooling machine to the heat exchanger again; And a cooling water storage tank (258) for replenishing the cooling water in the cooler (256).

Description

폐염산 회수장치 및 이를 이용한 회수방법{A facilities for refining waste acid and its refining method} Waste hydrochloric acid recovery device and recovery method using same {A facilities for refining waste acid and its refining method}

본 발명은 폐염산 회수설비 및 이를 이용한 폐염산 회수방법에 관한 것으로서, 보다 상세하게는, 폐염산 회수공정중 세정탑에서 순환되는 NaOH 수용액의 온도를 낮추어 배출되는 HCl의 농도를 저감시킬 수 있는 폐염산 회수설비 및 이를 이용한 폐염산 회수방법에 관한 것이다.The present invention relates to a waste hydrochloric acid recovery facility and a waste hydrochloric acid recovery method using the same, and more particularly, to reduce the concentration of HCl discharged by lowering the temperature of the NaOH aqueous solution circulated in the washing tower during the waste hydrochloric acid recovery process It relates to a hydrochloric acid recovery facility and a waste hydrochloric acid recovery method using the same.

제철공정에서 제조되는 열연강판과 냉연강판 스트립 표면에는 산화피막이 형성되어 있는데, 이러한 산화피막 및 기타 후속하는 공정에 영향을 줄 수 있는 불순물을 제거하기 위하여 HCl 18%로 그 표면을 세척하게 되는데 이와 같은 공정을 산세공정이라 한다. 이와 같은 산세공정에서는 산화피막과 HCl이 반응하여 FeCl2 수용액이 주성분인 폐산으로 배출되는데, 현재 제철소에서는 발생된 폐산을 열처리하여 HCl과 산화철로서 재생산하여 생산된 HCl은 산세척 공정으로 다시 재투입되며, 산화철은 안료 및 자성재료로서 활용되고 있다.Anodized film is formed on the surface of hot rolled and cold rolled steel strips produced in the steelmaking process, and the surface is washed with 18% HCl to remove impurities that may affect the oxide film and other subsequent processes. The process is called pickling process. In this pickling process, the oxide film and HCl react with each other, and FeCl 2 solution is discharged to waste acid, which is the main component. At the present steel mill, HCl produced by regenerating HCl and iron oxide is re-injected into the pickling process. Iron oxide is utilized as a pigment and a magnetic material.

상술한 폐산 재처리 공정을 위한 일반적인 폐염산 회수장치(100)가 도 1에 나타나 있으며, 크게 분무배소로(110), 흡수탑(130) 및 세정탑(130)으로 구성되어 있다.The general waste hydrochloric acid recovery apparatus 100 for the waste acid reprocessing process described above is shown in FIG. 1, and is composed of a spray furnace 110, an absorption tower 130, and a washing tower 130.

먼저, 상기 분무배소로(110)는 액상의 염화철을 고온의 가스(공업적으로 500~800℃)로 열처리하기 위한 설비이다. 즉, 상기 배소로(110)는 작은 액적으로 분무된 액상의 염화철용액중 수분이 증발시켜 건조된 입자형의 고체를 형성하고, 이 고체를 순간적으로 산화철과 Cl2가스로 열분해시킨다. 이렇게 생성된 산화철은 후단의 집진기에서 잡혀서 외부로 배출된다.First, the spray furnace 110 is a facility for heat-treating the liquid iron chloride with a high-temperature gas (500 ~ 800 ℃ industrial). That is, the roasting furnace 110 forms a dried particulate solid by evaporating water in the liquid iron chloride solution sprayed with small droplets, and thermally decomposes the solid into iron oxide and Cl 2 gas. The iron oxide thus produced is caught by the dust collector in the rear stage and discharged to the outside.

상기 흡수탑(130)은 상기 열분해반응으로 생성된 Cl2 가스를 HCl 수용액으로 회수하는 설비로서, 이러한 흡수탑(130)을 통과한 가스중에는 미량의 HCl이 남아있으며, 현재 산회수 설비의 대기오염 배출기준은 15ppm/Nm3으로 정해져 있다. 따라서, 흡수탑(130)의 후단에는 공해방지 설비로서 세정탑(150:fume scrubber)을 설치하여 법기준을 맞추어 가스를 대기중으로 배출하도록 하고 있다.The absorption tower 130 is a facility for recovering the Cl 2 gas generated by the pyrolysis reaction as an aqueous HCl solution, a small amount of HCl remains in the gas passed through the absorption tower 130, air pollution of the current acid recovery facility emission standards are defined as 15ppm / Nm 3. Therefore, the rear end of the absorption tower 130 is installed a washing tower (fume scrubber) (150) as pollution prevention equipment to meet the legal standards to discharge the gas into the atmosphere.

한편, 상기 산회수 설비 세정탑(150)은 그 중심부에 충진층(155)이 형성되어 있으며, 그 상부로부터 공급된 NaOH 수용액과 그 하부로부터 공급된 HCl가스가 상기 충진층(155)에서 중화반응을 일으켜 NaCl과 H2O를 생성하여 염산을 제거하므로 흔히 중화탑이라고도 한다.On the other hand, the acid recovery facility washing tower 150 has a packed layer 155 is formed in the center, the NaOH aqueous solution supplied from the top and HCl gas supplied from the bottom of the neutralization reaction in the packed layer 155 It is often referred to as a neutralization tower because it forms NaCl and H 2 O to remove hydrochloric acid.

이러한 세정탑(150)에 공급되는 HCl이 NaOH 수용액에 흡수되는 속도는 매우 빠르다. 또한 HCl이 NaOH 수용액이 상기 세정탑(150)의 충진층(155)에서 중화반응으로 NaCl과 물로 변하는 반응은 비가역반응이므로 이론적으로는 HCl은 완벽하게 제거될 수 있다고 보여지나, 실제에 있어서는 HCl의 제거가 완전하지 못하다는 문제가 있으며, 아울러 실제 상술한 공정이후 세정탑으로부터 배출되는 HCl농도는 0에서 15ppm의 범위에서 변동하고 있는 실정이다. The rate at which the HCl supplied to the washing tower 150 is absorbed in the NaOH aqueous solution is very fast. In addition, since HCl is a reaction in which NaOH aqueous solution is converted into NaCl and water by neutralization reaction in the packed bed 155 of the washing tower 150, it is theoretically shown that HCl can be completely removed, but in practice, There is a problem that the removal is not complete, and in addition, the HCl concentration discharged from the scrubber after the above-described process is in the range of 0 to 15ppm.

그러나 이러한 변동치는 향후 더욱 강화될 대기오염 배출기준을 고려할때 바람직한 수준이라 할 수 없으므로 보다 완전히 HCl을 제거할 수 있는 기술개발이 요청되고 있는 실정이다. However, since these fluctuations cannot be considered desirable considering the air pollution emission standards that will be further strengthened in the future, there is a demand for technology development to remove HCl more completely.

따라서 본 발명은 상기 종래기술의 문제점을 해결하기 위한 것으로, 세정탑에 순환 공급되는 중화액(NaON수용액)의 온도를 적정온도 이하로 제어함으로써 중화액중 수분의 증발을 방지하여 효과적으로 폐염산을 제거할 수 있는 폐염산 회수설비 및 그를 이용한 폐염산 회수방법을 제공함에 그 목적이 있다. Therefore, the present invention is to solve the problems of the prior art, by controlling the temperature of the neutralized liquid (NaON aqueous solution) circulated to the washing tower below the appropriate temperature to prevent the evaporation of water in the neutralized liquid to effectively remove the waste hydrochloric acid It is an object of the present invention to provide a waste hydrochloric acid recovery facility and a waste hydrochloric acid recovery method using the same.

상기의 목적을 달성하기 위한 본 발명은, The present invention for achieving the above object,

액상의 염화철을 산화철과 Cl2가스로 열분해시키는 배소로와, 상기 배소로 로부터 배출된 Cl2가스를 HCl수용액으로 회수하는 흡수탑, 그리고 중화액을 공급하는 순환관이 형성되어 있으며, 상기 흡수탑에서 미회수된 HCl가스를 중화액으로 중화시켜 제거하는 충진층이 형성되어 있는 세정탑을 포함하는 폐염산 회수장치에 있어서,A roasting furnace for pyrolyzing liquid iron chloride into iron oxide and Cl 2 gas, an absorption tower for recovering Cl 2 gas discharged from the roasting furnace into an aqueous HCl solution, and a circulation pipe for supplying a neutralizing solution are formed. In the waste hydrochloric acid recovery apparatus comprising a washing tower having a packed layer for neutralizing and removing the unrecovered HCl gas with a neutralizing solution,

상기 세정탑으로 공급되는 중화액의 온도를 낮출 수 있도록 상기 순환관상에 형성된 열교환기; 상기 열교환기로 부터 배출된 승온된 냉각수를 다시 상온으로 냉각시키는 냉각기; 상기 냉각기에서 냉각된 냉각수를 다시 상기 열교환기에 공급하도록 하는 냉각수펌프; 및 상기 냉각기에 냉각수를 보충하는 냉각수저장조;로 구성된 냉각설비를 포함하여 구성된 폐염산 회수장치에 관한 것이다.A heat exchanger formed on the circulation pipe to lower the temperature of the neutralizing liquid supplied to the washing tower; A cooler that cools the heated coolant discharged from the heat exchanger to room temperature again; A cooling water pump supplying the cooling water cooled by the cooling machine to the heat exchanger again; It relates to a waste hydrochloric acid recovery device comprising a cooling facility consisting of; and a cooling water storage tank for replenishing the coolant to the cooler.

또한, 본 발명은, In addition, the present invention,

액상의 염화철을 배소로에서 산화철과 Cl2가스로 열분해시키고, 상기 배소로로부터 배출된 Cl2가스를 흡수탑에서 HCl수용액으로 회수하며, 세정탑에서 상기 흡수탑에서 미회수된 HCl가스를 순환관으로 공급되는 중화액으로 중화시켜 제거하는 폐염산 회수방법에 있어서,Pyrolysis in a roasting of iron chloride in the liquid phase in the iron oxide and the Cl 2 gas and, to recover the Cl 2 gas discharged from the said roasting in an absorption tower with an aqueous HCl solution, the non-recovered HCl gas from the absorber in a spray tower circulation pipe In the waste hydrochloric acid recovery method to neutralize and remove the neutralized solution supplied by

상기 순환관을 통하여 상기 세정탑으로 공급되는 중화액은 그 온도가 60℃이하가 되도록 냉각제어되어 있음을 특징으로 하는 폐염산 회수방법에 관한 것이다. The neutralizing liquid supplied to the washing tower through the circulation pipe is a cooling hydrochloric acid recovery method characterized in that the cooling is controlled so that the temperature is 60 ℃ or less.

이하, 첨부도면을 참조하여 본 발명의 폐염산 회수장치를 설명한다.Hereinafter, the waste hydrochloric acid recovery apparatus of the present invention with reference to the accompanying drawings.

도 2는 본 발명에 따른 폐염산 회수장치(200)를 나타내는 개략 구성도이다.2 is a schematic configuration diagram showing a waste hydrochloric acid recovery apparatus 200 according to the present invention.

도 2에 나타난 바와 같이, 본 발명의 장치는 크게 액상의 염화철을 산화철과 Cl2가스로 열분해시키는 배소로(210), 상기 배소로(210)로부터 배출된 Cl2가스를 HCl수용액으로 회수하는 흡수탑(230) 및 상기 흡수탑(230)에서 미회수된 HCl가스를 최종제거하는 세정탑(250)으로 대별된다.As shown in FIG. 2, the apparatus of the present invention is an absorption furnace 210 for pyrolyzing liquid iron chloride into iron oxide and Cl 2 gas, and recovering Cl 2 gas discharged from the roaster 210 to HCl aqueous solution. The tower 230 and the absorption tower 230 is roughly divided into a washing tower 250 to remove the unrecovered HCl gas.

그리고 상기 세정탑(250)에는 순환펌프(251a)를 통하여 그 하부로부터 상부로 중화액을 재순환시키는 순환관(251)이 형성되어 있으며, 이러한 재순환되는 중화액은 NaOH수용액에 NaCl이 일부 잔존하고 있다. 그리고 상기 순환관(251)에는 도 2에 도시되지는 않았지만 NaOH수용액을 새로이 공급할 수 있는 공급구가 그 상부에 형성되어 있다. The washing tower 250 is provided with a circulation tube 251 for recycling the neutralization liquid from the lower portion to the upper portion through the circulation pump 251a. In the neutralizing liquid to be recycled, some NaCl remains in the aqueous NaOH solution. . In addition, although not shown in FIG. 2, the circulation pipe 251 has a supply port for newly supplying an aqueous NaOH solution.

또한, 상기 세정탑(250)에는 상기 흡수탑(230)에서 미회수된 HCl가스를 상기 순환관(251)으로 공급되는 중화액(NaOH 수용액)으로 중화시켜 제거하기 위하여 충진층(253)이 형성되어 있다 . In addition, a filling layer 253 is formed in the washing tower 250 to neutralize and remove the unrecovered HCl gas from the absorption tower 230 with a neutralizing solution (NaOH aqueous solution) supplied to the circulation pipe 251. It is.

본 발명은 상기와 같이 구성된 폐염산 회수장치에 있어서, 상기 세정탑(250)에 순환공급되는 중화액의 온도를 낮추기 위해 열교환기(255), 냉각기(256), 냉각기 펌프(257), 냉각수 저장조(258)로 구성된 냉각설비를 부설함을 그 특징으로 한다.In the waste hydrochloric acid recovery apparatus configured as described above, the heat exchanger 255, the cooler 256, the cooler pump 257, the coolant storage tank to lower the temperature of the neutralized liquid circulated to the washing tower 250 It is characterized by the installation of a cooling system consisting of (258).

상세하게 설명하면, 도 2와 같이, 본 발명에서는 상기 세정탑(250)의 상부로 공급되는 중화액의 온도를 낮추기 위해 상기 순환관(251)상에 열교환기(255)를 형성한다. 그리고 상기 열교환기(255)로부터 배출된 승온된 냉각수를 다시 상온으로 냉각시키기 위하여 냉각기(256)를 형성하며, 아울러 이와 같이 냉각된 냉각수를 다시 상기 열교환기(255)에 공급하기 위해 상기 냉각기와 열교환기 사이에 냉각수 펌프(257)를 형성한다. In detail, as shown in FIG. 2, in the present invention, a heat exchanger 255 is formed on the circulation pipe 251 to lower the temperature of the neutralizing liquid supplied to the upper portion of the washing tower 250. In addition, a cooler 256 is formed to cool the heated coolant discharged from the heat exchanger 255 to room temperature again, and the heat exchanger with the cooler to supply the cooled coolant to the heat exchanger 255 again. Cooling water pump 257 is formed between the two.

또한, 상기 냉각기(256)은 공냉방식을 취할 수 있으므로 공냉중 증발되는 양만큼 냉각수를 보충해줄 필요가 있으므로, 그 부족한 냉각수를 보충하기 위한 냉각수 저장조(258)를 형성하고 있으며, 바람직하게는, 상기 냉각기(256)와 냉각수 저장조(258)사에에 냉각수 저장조펌프(259)를 구비하는 것이다. In addition, since the cooler 256 may take an air cooling method, it is necessary to replenish the cooling water by an amount evaporated during air cooling, and thus, a cooling water storage tank 258 for replenishing the insufficient cooling water is formed. The cooler 256 and the coolant reservoir 258 are provided with a coolant reservoir pump 259.

이하, 상술한 폐염산 회수장치를 이용한 본 발명의 폐염산 회수방법을 설명한다. Hereinafter, the waste hydrochloric acid recovery method of the present invention using the waste hydrochloric acid recovery apparatus described above will be described.

먼저, 배소로(210)내로 액상의 염화철용액을 분무하면 공업적으로 500~800℃의 가스에 의해 그중 수분은 증발되면서 건조된 입자형의 고체를 형성하고, 이 고체가 산화철과 Cl2가스로 순간적으로 열분해된다. 여기에서, 생성된 산화철은 통상 후단의 집진기에서 포집되어 외부로 배출된다.First, when the liquid iron chloride solution is sprayed into the roasting furnace 210, industrially, the water is evaporated by the gas of 500 to 800 ° C. to form dried solid particles, and the solid is formed of iron oxide and Cl 2 gas. It is instantaneously pyrolyzed. Here, the produced iron oxide is usually collected by the dust collector of the rear stage and discharged to the outside.

그리고 상기 배소로(210)에서의 열분해반응으로 생성된 Cl2가스는 흡수탑 (230)의 하부로 공급되고, 여기서 그 상부로 공급된 물에 의해 HCl수용액으로 회수되어 제거한다. 그러나 이때 상기 흡수탑(230)을 통과한 가스중에는 여전히 미량의 HCl이 남아 있다.And Cl 2 gas generated by the pyrolysis reaction in the roasting furnace 210 is supplied to the lower portion of the absorption tower 230, where it is recovered to remove the HCl aqueous solution by the water supplied to the upper portion. However, a small amount of HCl still remains in the gas passing through the absorption tower 230.

이후, 이와 같이 상기 흡수탑(230)에서 미회수된 HCl가스는 세정탑(250)의 하부 일측으로 제공되고, 그 상부로 공급된 중화액에 의해 충진층(253)에서 중화반응에 의해 최종 제거된다. Thereafter, the unrecovered HCl gas in the absorption tower 230 is provided to one side of the lower portion of the washing tower 250 and finally removed by the neutralization reaction in the packed layer 253 by the neutralization liquid supplied to the upper portion. do.

본 발명에서는 상기 세정탑(250)에서 HCl가스를 NaOH수용액으로 중화반응시켜 제거함에 있어서, 그 상부로 공급되는 중화액의 온도를 60℃이하가 되도록 제어함을 특징으로 한다. In the present invention, in the removal of the HCl gas by neutralizing the NaCl aqueous solution in the washing tower 250, the temperature of the neutralizing liquid supplied to the upper portion is controlled to be 60 ℃ or less.

즉, 세정탑(250)의 하부 일측으로 공급된 HCl가스를 중화반응에 의해 제거함에 있어서, 상기 순환관(251)을 통하여 세정탑(250)에 공급되는 중화액의 온도를 제어함을 그 특징으로 하는데, 이에 의해 보다 효율적으로 HCl이 제거될 수 있음에 기초한 것이다. 이를 세정탑(250)에서 HCl이 중화반응으로 제거되는 원리에 기초하여 설명하면 다음과 같다. That is, in removing the HCl gas supplied to the lower side of the washing tower 250 by the neutralization reaction, the temperature of the neutralizing liquid supplied to the washing tower 250 through the circulation pipe 251 is controlled. This is based on the fact that HCl can be removed more efficiently. This will be described based on the principle that the HCl is removed by the neutralization reaction in the washing tower 250 as follows.

상기 흡수탑(230)에서 미회수된 HCl가스는 세정탑(250)의 하부 일측으로 제공되는데, 이때 프로세스 용량에 따라 다르지만 HCl가스는 대략 80℃정도의 온도를 유지하고 있다. 또한, 상기 순환관(251)을 통하여 세정탑(250)으로 재순환되는 중화액의 온도 또한, 대략 80℃정도라 볼 수 있다.The unrecovered HCl gas from the absorption tower 230 is provided to the lower side of the scrubber tower 250, where the HCl gas is maintained at a temperature of about 80 ° C. depending on the process capacity. In addition, the temperature of the neutralized liquid recycled to the washing tower 250 through the circulation pipe 251 may also be approximately 80 ℃.

이러한 온도를 갖는 중화액과 HCl가스가 상기 세정탑의 충진층(253)에서 만나 HCl가스를 제거하는 중화반응이 일어나는데, 상술하면 상기 충진층(253)을 채우고 있는 수많은 충진재의 표면을 덮고 있는 중화액(NaOH수용액)속으로 HCl이 흡수제거되는 반응이라고 할 수 있다. The neutralization liquid having such a temperature and the HCl gas meets in the packing layer 253 of the scrubber to remove the HCl gas, and the neutralization reaction occurs. It can be said that HCl is absorbed and removed into a liquid (NaOH aqueous solution).

그러나 상기와 같은 온도를 갖는 중화액을 이용하여 실제 중화반응시킬 경우 상기 충진층(253)에서 중화액중 수분이 증발하는데, 이러한 수분증발은 HCl의 흡착제거방향과 상반되어 미량의 HCl가스는 흡착제거되지 못한 상태로 외부로 배출되는 문제가 있다. However, when the neutralization reaction is performed using the neutralization liquid having the above temperature, the water in the neutralization liquid evaporates in the filling layer 253. This evaporation of water is opposite to the adsorption and removal direction of HCl, so that a small amount of HCl gas is adsorbed. There is a problem that is discharged to the outside without being removed.

따라서 본 발명에서는 이를 해결하기 위한 것으로, 상기 세정탑(250)으로 공급되는 중화액의 온도를 종전의 80℃에서 60℃이하로 냉각제어함으로써 중화액중 수분증발을 방지하고, 이에 따라 공급된 HCl가스를 거의 완전히 흡착제거할 수 있는 것이다. 다시 말하면, 본 발명은 중화액중 수분의 수분의 증발정도의 온도에 의존함에 착안하여, 세정탑에 공급되는 중화액의 온도를 낮춤으로써 주어진 온도에서 중화액중 수분을 포화상태로 유도하고, 이에 따라 그 증발을 방지함으로써 HCl 가스의 거의 완전한 중화제거를 도모할 수 있는 것이다. Therefore, in the present invention to solve this, by controlling the cooling temperature of the neutralizing liquid supplied to the washing tower 250 from the previous 80 ℃ to less than 60 ℃ to prevent the water evaporation in the neutralizing liquid, thus supplied HCl The gas can be almost completely desorbed. In other words, the present invention focuses on the temperature of the degree of evaporation of the moisture in the neutralizing liquid, thereby lowering the temperature of the neutralizing liquid supplied to the scrubber to induce the water in the neutralizing liquid to a saturated state at a given temperature. Therefore, by preventing the evaporation, it is possible to almost completely neutralize and remove the HCl gas.

상술한 바와 같이, 본 발명은 세정탑에 순환 공급되는 중화액(NaON수용액)의 온도를 60℃이하로 제어함으로써 중화액중 수분의 증발을 방지하여 HCl배출농도가 50%이하로 낮게 유지될 뿐만 아니라 그 배출농도 변동치도 0~6ppm정도로 유지될 수 있는 폐염산 회수설비 및 그를 이용한 폐염산 회수방법을 제공함에 그 유용한 효과가 있다. As described above, the present invention prevents the evaporation of water in the neutralized solution by controlling the temperature of the neutralized liquid (NaON aqueous solution) circulated and supplied to the washing tower to keep the HCl emission concentration as low as 50% or less. In addition, there is a useful effect in providing a waste hydrochloric acid recovery facility and the waste hydrochloric acid recovery method using the same can be maintained in the emission concentration fluctuation of about 0 ~ 6ppm.

도 1은 종래의 일반적인 폐염산 회수장치를 나타내는 구성도.1 is a block diagram showing a conventional general waste hydrochloric acid recovery apparatus.

도 2는 본 발명에 따른 냉각설비가 추가된 폐염산 회수장치를 니타내는 구성도.Figure 2 is a block diagram showing the waste hydrochloric acid recovery apparatus is added cooling equipment according to the present invention.

* 도면의 주요부분에 대한 부호의 설명*  * Explanation of symbols for the main parts of the drawings *

210............ 배소로 230.............흡수탑 210 ............ 230 by Basoso ............ Absorbing tower

250............ 세정탑 251..............순환관250 ............ Cleaning tower 251 .............. Circulation pipe

255.............열교환기 256..............냉각기255 .................. Heat exchanger 256 .............. Cooler

258.............냉각수저장조258 ............. Coolant reservoir

Claims (2)

액상의 염화철을 산화철과 Cl2가스로 열분해시키는 배소로(210)와, 상기 배소로 (210)로부터 배출된 Cl2가스를 HCl수용액으로 회수하는 흡수탑 (230), 그리고 중화액을 공급하는 순환관(251)이 형성되어 있으며, 상기 흡수탑(230)에서 미회수된 HCl가스를 중화액으로 중화시켜 제거하는 충진층(253)이 형성되어 있는 세정탑 (250)을 포함하는 폐염산 회수장치에 있어서,Circulation furnace 210 for pyrolyzing liquid iron chloride into iron oxide and Cl 2 gas, absorption tower 230 for recovering Cl 2 gas discharged from the furnace 210 as HCl aqueous solution, and a neutralizing solution Tube 251 is formed, waste hydrochloric acid recovery apparatus including a washing tower 250 is formed with a packed layer 253 for neutralizing and removing the unrecovered HCl gas in the absorption tower 230 with a neutralization liquid To 상기 세정탑(250)으로 공급되는 중화액의 온도를 낮출 수 있도록 상기 순환관(251)상에 형성된 열교환기(255); 상기 열교환기(255)로 부터 배출된 승온된 냉각수를 다시 상온으로 냉각시키는 냉각기(256); 상기 냉각기에서 냉각된 냉각수를 다시 상기 열교환기에 공급하도록 하는 냉각수펌프(257); 및 상기 냉각기(256)에 냉각수 를 보충하는 냉각수저장조(258);로 구성된 냉각설비를 포함하여 구성된 폐염산 회수장치.A heat exchanger 255 formed on the circulation pipe 251 to lower the temperature of the neutralizing liquid supplied to the washing tower 250; A cooler (256) for cooling the heated coolant discharged from the heat exchanger (255) back to room temperature; A cooling water pump 257 for supplying the cooling water cooled by the cooling machine to the heat exchanger again; And a cooling water storage tank (258) for replenishing the cooling water to the cooler (256). 액상의 염화철을 배소로(210)에서 산화철과 Cl2가스로 열분해시키고, 상기 배소로 (210)로부터 배출된 Cl2가스를 흡수탑(230)에서 HCl수용액으로 회수하며, 세정탑 (250)에서 상기 흡수탑(230)에서 미회수된 HCl가스를 그 순환관(251)으로 공급되는 중화액으로 중화시켜 제거하는 폐염산 회수방법에 있어서,The liquid iron chloride is pyrolyzed into iron oxide and Cl 2 gas in the roasting furnace 210, the Cl 2 gas discharged from the roasting furnace 210 is recovered as an aqueous HCl solution in the absorption tower 230, and in the washing tower 250. In the waste hydrochloric acid recovery method of neutralizing and removing the unrecovered HCl gas from the absorption tower 230 with a neutralizing liquid supplied to the circulation pipe 251, 상기 순환관(251)을 통하여 상기 세정탑(250)으로 공급되는 중화액은 그 온도가 60℃이하가 되도록 냉각제어되어 있음을 특징으로 하는 폐염산 회수방법. The neutralizing liquid supplied to the washing tower (250) through the circulation pipe (251) is cooled and controlled so that the temperature is 60 ℃ or less.
KR10-2000-0079601A 2000-12-21 2000-12-21 A facilities for refining waste acid and its refining method KR100470658B1 (en)

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