{"id":566,"date":"2017-11-20T11:18:27","date_gmt":"2017-11-20T10:18:27","guid":{"rendered":"http:\/\/naf.se\/?page_id=566"},"modified":"2018-06-07T14:19:50","modified_gmt":"2018-06-07T12:19:50","slug":"satsvisa-kokare","status":"publish","type":"page","link":"https:\/\/nafse24.hamlet2.hamrenmedia.se\/sv\/applikationer\/kemisk-massaframstallning\/fiberline\/kokeri\/satsvisa-kokare\/","title":{"rendered":"Satsvis kokare"},"content":{"rendered":"

Satsvis (batch) kokare<\/h1><\/div>
<\/div><\/div><\/div><\/div><\/div>

Vid denna process upphettas flisen och kokv\u00e4tskan under tryck enligt ett angivet temperatur-tidsprogram. I slutet av programmet t\u00f6ms kokaren genom att massan bl\u00e5ses eller pumpas ut till bl\u00e5stanken.<\/p>\n

Den f\u00f6rbrukade kokv\u00e4tskan, inneh\u00e5llande kemikalier, lignin och andra l\u00f6sta organiska \u00e4mnen, kallas svartlut (eller om den sp\u00e4ds ut med tv\u00e4ttvatten, ”tunnlut”).<\/p>\n

\u00c5ngan som sl\u00e4pps ut i bl\u00e5stanken \u00e5tervinns i en kondensor d\u00e4r den kondenseras. Kondensatet kyles d\u00e4refter i en v\u00e4rmev\u00e4xlare, vilket skapar en stor volym varmvatten som kan anv\u00e4ndas f\u00f6r att tv\u00e4tta massan i blekeriet.<\/p>\n

Batchkokssystemet har utvecklats avsev\u00e4rt de senaste \u00e5ren. Nya system arbetar i cykler och anv\u00e4nder energi fr\u00e5n en kokare till n\u00e4sta. F\u00f6rdelarna \u00e4r l\u00e4gre energi- och lutf\u00f6rbrukning. Nackdelarna \u00e4r ett mer komplicerat styrsystem och st\u00f6rre slitage p\u00e5 utrustningen.<\/p>\n

Satsvisa (batch) kokare kan k\u00f6ras med antingen sulfatprocessen eller sulfitprocessen. Vid sulfatprocessen \u00e4r kokv\u00e4tskan alkalisk (h\u00f6gt pH), medan sulfitmassa vanligtvis \u00e4r sur (l\u00e5gt pH). Materialval i ventilerna \u00e4r mycket viktig.<\/p>\n

Den stora majoriteten av nya massafabriker utnyttjar sulfatprocessen.<\/p>\n<\/div>

<\/div><\/div><\/div>
<\/a>

Tryck f\u00f6r st\u00f6rre bild.<\/em><\/p>\n<\/div>

<\/div><\/div><\/div>

Exempel p\u00e5 NAF-ventiler som anv\u00e4nds i denna process<\/h2><\/div>
    \n
  • NAF <\/b>Procap<\/b> flisfyllningsventil (\u201ccapping valve\u201d)- flisp\u00e5fyllnad till kokaren<\/li>\n
  • NAF Duball DL <\/b>fullopps kulventil- t\u00f6mningsventil f\u00f6r massan (bl\u00e5sventil), h\u00f6g- och l\u00e5gtrycks gasevakueringsventiler, tryckh\u00e5llningsventil, lutinmatningsventil, tryckregleringsventil f\u00f6r flisfyllningsaggregat<\/li>\n
  • NAF Trunnball DL <\/b>fullopps lagrad kulventil- matning av mellantrycks\u00e5nga till kokaren (reglering)<\/li>\n
  • NAF <\/b>Setball<\/b> V-ports kulsektorventil f\u00f6r reglering- niv\u00e5reglering av \u00e5ngkondensat, temperaturreglering av koklut efter v\u00e4rmev\u00e4xlare<\/li>\n
  • NAF <\/b>Torex<\/b> trippeleccentriskt vridspj\u00e4llsventil- koklutens toppcirkulation<\/li>\n
  • NAF <\/b>Turnex<\/b> pneumatisk man\u00f6verdon- f\u00f6r all anv\u00e4ndning p\u00e5 NAFs vridande on\/off- och regler-ventiler<\/li>\n
  • NAF <\/b>Duball<\/b> DL <\/b>Pocketventil<\/b>– sandavskiljning f\u00f6r separator<\/li>\n
  • NAF Check <\/b>spj\u00e4llbackventil– <\/b>allm\u00e4n anv\u00e4ndning p\u00e5 massa-, \u00e5ng- och svartlutsledningar<\/li>\n
  • NAF Triball <\/b>tredelad, fullopps kulventil- dr\u00e4nageventil, provtagningsventiler<\/li>\n<\/ul>\n<\/div>
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