KR19990012208A - Wastewater Treatment Method of Urea Plant by Novel Ammonia Recovery Technique - Google Patents
Wastewater Treatment Method of Urea Plant by Novel Ammonia Recovery Technique Download PDFInfo
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- KR19990012208A KR19990012208A KR1019970035541A KR19970035541A KR19990012208A KR 19990012208 A KR19990012208 A KR 19990012208A KR 1019970035541 A KR1019970035541 A KR 1019970035541A KR 19970035541 A KR19970035541 A KR 19970035541A KR 19990012208 A KR19990012208 A KR 19990012208A
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- urea plant
- urea
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Abstract
본 발명은 요소공장에서 발생되는 암모니아성 폐수중 암모니아를 회수하고 이에 따라 요소공장에서 발생되는 폐수를 처리하는 기술에 관한 것이다. 더욱 상세히는 요소공장에서 발생되는 암모니아성 폐수를 탈착기(Desorber)를 이용하여 암모니아를 회수하여 요소 재료로 재활용하고, 암모니아가 제거된 폐수를 처리하는 기술에 관한 것이다.The present invention relates to a technique for recovering ammonia in the ammonia wastewater generated in the urea plant and thus treating wastewater generated in the urea plant. More specifically, the present invention relates to a technology for recovering ammonia wastewater generated in a urea plant using a desorber, recycling the ammonia into urea material, and treating wastewater from which ammonia has been removed.
Description
본 발명은 요소공장에서 발생되는 암모니아성 폐수중 암모니아를 회수하고 이에 따라 요소공장에서 발생되는 폐수를 처리하는 기술에 관한 것이다. 더욱 상세히는 요소공장에서 발생되는 암모니아성 폐수를 탈착기(Desorber)를 이용하여 암모니아를 회수하여 요소 재료로 재활용하고, 암모니아가 제거된 폐수를 처리하는 기술에 관한 것이다.The present invention relates to a technique for recovering ammonia in the ammonia wastewater generated in the urea plant and thus treating wastewater generated in the urea plant. More specifically, the present invention relates to a technology for recovering ammonia wastewater generated in a urea plant using a desorber, recycling the ammonia into urea material, and treating wastewater from which ammonia has been removed.
종래에는 요소공장 농축장치에서 나오는 암모니아성 응축수는 중화처리하여 폐기처리하여 왔다. 그러나 이러한 응축수중에 폐기처리되는 암모니아의 양은 응축수중에 약 1 중량%를 함유하여 막대한 원료의 손실 및 공해의 원인이 되곤 하였다. 제 1도는 종래의 요소공장 제조공정 및 폐수처리 방법을 나타낸 공정도이다.Conventionally, ammonia condensate from the urea plant concentrator has been neutralized and disposed of. However, the amount of ammonia to be disposed of in the condensate contained about 1% by weight in the condensate, which would cause huge loss of raw materials and pollution. 1 is a process diagram showing a conventional urea plant manufacturing process and wastewater treatment method.
따라서 본 발명은 종래의 폐기처리되던 암모니아를 탈착기를 이용하여 회수하고 이를 다시 본 공정에 사용하고 이에따라 방류되던 폐수중의 암모니아의 함량을 축소하여 폐수를 처리하는 기술을 개발한 것이다.Therefore, the present invention has developed a technique for treating wastewater by recovering ammonia, which has been disposed of in the prior art, by using a desorber and using it in the present process, and reducing the content of ammonia in the wastewater discharged accordingly.
제 1 도는 종래의 요소공장의 요소 제조공정 및 이에따른 폐수처리 공정도이다.1 is a urea manufacturing process and subsequent wastewater treatment process diagram of a conventional urea plant.
제 2 도는 본 발명에 의한 요소공장의 요소 제조공정 및 이에따른 암모니아 회수기법에 따른 폐수처리 공정도이다.2 is a urea manufacturing process of the urea plant according to the present invention and the wastewater treatment process according to the ammonia recovery method according to the present invention.
본 발명은 요소공장 농축장치에서 발생되는 암모니아성 폐수를 응축시키고 이를 탈착기(Desorber)에서 직접 수증기법으로 탈착시켜 기체상의 암모니아를 회수하고 암모니아가 제거된 폐수를 폐기하는 폐수처리방법에 관한 것이다.The present invention relates to a wastewater treatment method for condensing ammonia wastewater generated in a urea plant concentrator and desorbing it by a direct steam method in a desorber to recover gaseous ammonia and to discard wastewater from which ammonia has been removed.
이하 본 발명을 첨부된 도면 제 2 도에 의거 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to FIG. 2.
요소농축장치에서 발생되는 폐수를 응축기를 통과시키고 본 발명에서 설치한 탈착기 상부로 이송한다. 탈착기에 투입된 폐액은 탈착기 하단에서 들어오는 수증기와 직접 접촉하여 대부분의 암모니아가 탈착기 상부로 제거된다. 이때 상부로 이송된 암모니아는 탈착기의 자체 압력(약 2.5 기압)으로 요소공장의 저압 분해탑으로 이송되어 요소 재료로 재활용한다.Waste water from the urea concentrator is passed through the condenser and transferred to the upper part of the desorber installed in the present invention. The waste liquid introduced into the desorber is in direct contact with the water vapor coming from the bottom of the desorber to remove most of the ammonia from the top of the desorber. At this time, the ammonia transferred to the upper part is transferred to the low pressure decomposition tower of the urea plant at the pressure of the desorber (about 2.5 atm) and recycled as urea material.
따라서 요소농축장치에서 발생하는 암모니아성 폐수중 암모니아를 회수하여 요소공자에 재료로 재활용할 수 있게 되었고, 이때 암모니아의 분리를 위하여 탈착기내에 직접 수증기법에 의한 스트리핑 기술을 응용하고(운전압력 3.0∼3.5 기압), 제거된 기체상의 암모니아는 자체 압력으로 요소공장의 저압 분해탑에 효과적으로 이송할 수 있다. 또한 이러한 암모니아 회수기법에 따라 종래의 폐수의 pH를 약 10∼11에서 약 8 정도로 낮출 수 있게 되었으며, 폐수중의 암모니아의 농도도 종래의 1 중량%에서 본 발명의 암모니아 회수공정을 이용한 경우 100ppm 이하로 감축하게 된 것이다.Therefore, ammonia in the ammonia wastewater generated by the urea concentrator can be recovered and recycled as a material to urea pores.In this case, a stripping technique by steam method is applied directly to the desorber to separate the ammonia (operating pressure 3.0 to 3.5 atm), the removed gaseous ammonia can be effectively transferred to the low pressure cracking tower of the urea plant at its own pressure. In addition, according to the ammonia recovery technique, the pH of the conventional wastewater can be lowered from about 10 to about 8, and the concentration of ammonia in the wastewater is also 100 ppm or less in the case of using the ammonia recovery process of the present invention at the conventional 1% by weight. It will be reduced to.
본 발명의 효과는 요소농축장치에서 발생하는 암모니아성 폐수중의 암모니아를 회수하여 요소공정에 재활용할 수 있게 되었고, 폐수중의 암모니아의 배출량을 100ppm 이하로 감축함으로서 환경오염의 방지를 이룩하게 된 것이다.The effect of the present invention is to recover the ammonia in the ammonia wastewater generated by the urea concentrator and to recycle it to the urea process, and to reduce the emission of ammonia in the wastewater to 100ppm or less to prevent environmental pollution. .
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970035541A KR19990012208A (en) | 1997-07-28 | 1997-07-28 | Wastewater Treatment Method of Urea Plant by Novel Ammonia Recovery Technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970035541A KR19990012208A (en) | 1997-07-28 | 1997-07-28 | Wastewater Treatment Method of Urea Plant by Novel Ammonia Recovery Technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR19990012208A true KR19990012208A (en) | 1999-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019970035541A KR19990012208A (en) | 1997-07-28 | 1997-07-28 | Wastewater Treatment Method of Urea Plant by Novel Ammonia Recovery Technique |
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| Country | Link |
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| KR (1) | KR19990012208A (en) |
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1997
- 1997-07-28 KR KR1019970035541A patent/KR19990012208A/en not_active Application Discontinuation
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