IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0856961
(1999-11-24)
|
우선권정보 |
SE-199804061 (1998-11-26) |
국제출원번호 |
PCT/SE99/02170
(1999-11-24)
|
국제공개번호 |
WO00/34569
(2000-06-15)
|
발명자
/ 주소 |
- Sandquist, Kent K.
- Wennberg, Olle
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
3 |
초록
▼
A method to remove sulfides and other volatile contaminants from liquor vapor condensate in a pulp manufacturing process, where the mentioned liquor vapor condensate is fed into a stripper, which is part of a closed loop system including the stripper, a regenerative thermal oxidization process (RTO)
A method to remove sulfides and other volatile contaminants from liquor vapor condensate in a pulp manufacturing process, where the mentioned liquor vapor condensate is fed into a stripper, which is part of a closed loop system including the stripper, a regenerative thermal oxidization process (RTO) and a SO 2 scrubber, in which loop a gas is circulated, preferably air, and such components formed or stripped off, in this loop whereafter the circulating gas is stripped off sulfides and other volatile components from the liquor vapor condensate, whereafter the gas stream is fed into a RTO process, where the stripped off contaminants are combusted are under formation of SO 2 and thereafter the SO 2 enriched gas is led to a SO 2 scrubber, where preferably alkali is used as absorption medium, and thereafter the circulating gas is returned back into the stripper.
대표청구항
▼
1. A method of removing sulphides and other volatile contaminants from liquor vapor condensate from a pulp manufacturing process, comprising, feeding said liquor vapor condensate from a pulp manufacturing process into a stripper ( 1 ), which is part of a closed loop comprising said stripper ( 1 ) a
1. A method of removing sulphides and other volatile contaminants from liquor vapor condensate from a pulp manufacturing process, comprising, feeding said liquor vapor condensate from a pulp manufacturing process into a stripper ( 1 ), which is part of a closed loop comprising said stripper ( 1 ) a regenerative thermal oxidizer process (RTO)( 2 ) and an SO 2 scrubber ( 3 ), in which loop a gas ( 4 ), comprising air and components formed or stripped off in the loop, are circulated, and where the circulating gas is used to strip off sulphides and other volatile components from the liquor vapor condensate from a pulp manufacturing process ( 5 ), whereafter the gas stream ( 6 ) exiting said stripper ( 1 ) is fed into said RTO-process ( 2 ), where the stripped off components are combusted forming an SO 2 enriched gas, and thereafter feeding the SO 2 enriched gas ( 7 ) to the SO 2 scrubber ( 3 ), whereafter the circulating gas is returned to the stripper ( 1 ). 2. A method as claimed in claim 1, wherein the SO 2 scrubber ( 3 ) is part of the closed loop. 3. A method as claimed in claim 1 or 2, further comprising bleeding off from said loop a portion of the gas ( 10 ) in said loop, at the same time air or oxygen containing gas ( 9 ) is supplied to said loop. 4. A method as claimed in claim 3, wherein the gas ( 10 ) being bled off from the system is minimized by adding pure oxygen or an oxygen enriched air mixture to said loop, necessary as make up gas ( 9 ) for said oxidation. 5. A method as claimed in claim 3, further comprising scrubbing said bled off gas ( 10 ) with regard to SO 2 in a separate scrubber. 6. A method as claimed in claim 1, wherein alkali ( 8 ) is used as an absorption medium in said SO 2 scrubber. 7. A method as claimed in claim 6, wherein aid absorption medium is oxidized white liquor. 8. A method as claimed in claim 1 wherein the degree of acidification in the SO 2 scrubber ( 3 ) is controlled to ensure sufficient amount of SO 2 remaining in the gas ( 4 ) when it is returned to the stripper ( 1 ), where SO 2 acidifies the condensate ( 5 ) and thereby contributes to enhance the stripping off of sulphides from the condensate. 9. A method as claimed in claim 1, wherein a heat exchanger is installed in the closed loop, to recover or supply energy and thereby to control the temperature in the system. 10. A method as claimed in claim 1, wherein the amount of recirculated gas versus the amount of condensate is controlled for the purpose of optimizing the methanol content in the condensate.
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