Continuous digester. ANDRITZ Continuous Pulp Cooking System Extraction Zone
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1 APPLICATION REPORT Continuous digester ANDRITZ Continuous Pulp Cooking System Extraction Zone Flash Steam to SteamingVessel PV-16 Flash Steam to Chip Bin HV-16 KV-16A KV-16A...D Switching Valves KV-16B KV-16C KV-16D Flash Tank #1 Flash Tank #2 Black Liquor to Evaporators Note: Not required on current design LV-16 LV-17 KV-19A KV-19A...D Switching Valves KV-19B KV-19C KV-19D Black Liquor to Heat Exhanger Introduction and background Continuous cooking is a method of chemical cooking in which wood chips and cooking liquors are fed at controlled rates into the pressurized digester, the chips move down through successive cooking zones within the digester and are continuously discharged at the bottom as pulp. Extraction from the digester, Hi-Heat washing, heat recovery and the application of valves from Metso Automation in this process will be addressed in this bulletin. Process description The last stage within the ANDRITZ digester is a wash zone. Wash filtrate is added to the digester bottom via side dilution and counter wash nozzles. This wash filtrate travels countercurrent to the chip mass and is removed at the extraction screens located along the circumference of the digester. Digesters with EMCC cooking use this same wash flow to extend the cooking time and wash at the same time. Wash zone retention times vary from nearly no time up to 4 hours with most digesters having 2 to 3 hours. The extracted liquor is at cooking temperature and is allowed to flash under controlled conditions in flash tanks in order to recover its energy. The recovered steam may be used in the steaming vessel and chip bin to reduce the energy demand of the cooking system. 2611/02/04 EN 10/2011
2 2611/02/04 EN CONTINUOUS DIGESTER Tag # HV-16 X Two Vessel System X Single Vessel System Digester Wash Extraction to No. 1 Flash Tank Black Liquor Control Valve HV-16 controls the combined extraction liquor flow to No. 1 flash tank. Differential: psid or 1,4-2,8 bar Shut-Off: 186 psid = 13 bar Temp: 325 F = 165 C Flow: gal/min or liters/min Size: 3 or 4 DN 80 or DN 100 Recommendation: M2DA AP-B1J -ND M1LA AP-B1J -ND Tag HV-16 is equipped with a spring return actuator to close the valve and isolate the extraction line on loss of air supply. Tag # HV-22 Two Vessel System X Single Vessel System Lower Cooking Extraction (Low Solids Cooking) Black Liquor Control Valve HV-22 controls the combined extraction liquor flow to No. 1 flash tank. Differential: psid or 1,4-2,8 bar Shut-Off: 186 psid = 13 bar Temp: 325 F = 165 C Flow: gal/min or liters/min Size: 3 or 4 DN 80 or DN 100 Recommendation: M2DA AP-B1J -ND M1LA AP-B1J -ND Tag HV-22 is equipped with a spring return actuator to close the valve and isolate the extraction line on loss of air supply. Tag # HV-26 Two Vessel System X Single Vessel System Lower Cooking Extraction (Low Solids Cooking) Black Liquor Control Valve HV-26 controls the combined extraction liquor flow to No. 1 flash tank. Differential: psid or 1,4-2,8 bar Shut-Off: 186 psid = 13 bar Temp: 325 F = 165 C Flow: gal/min or liters/min Size: 3 or 4 DN 80 or DN 100 Recommendation: M2DA AP-B1J -ND M1LA AP-B1J -ND Tag HV-26 is equipped with a spring return actuator to close the valve and isolate the extraction line on loss of air supply. 2 APPLICATION REPORT 10/11
3 CONTINUOUS DIGESTER 2611/02/04 EN Tag # KV-16 (A-D) X Two Vessel System X Single Vessel System Digester Extraction Switching Black Liquor On-Off Valve Tags KV-16 (A-D) are switching valves controlling flow through the extraction screens to the No. 1 flash tank. Shut-Off: 10 psid or 0,7 bar Temp: 325 F or 163 C Flow: 1500 gal/min or 5700 liters/min Size: 6 DN 150 Recommendation: B2B06AABD-B1CU11-SV-F-SS LW8MBT150AANAT-B1CU11-SV T = Switching valve construction Tag # KV-19 (A-D) X Two Vessel System X Single Vessel System Modified Cooking Extraction Switching Black Liquor On-Off Valve KV-19A, KV-19B, KV-19C, KV-19D are switching valves that control the flow in the modified cooking zone. The extracted liquor is pumped to the MCC heater. Shut-off: 10 psid or 0,7 bar Temp: 325 F or 163 C Flow: 1500 gal/min or 5700 liters/min Size: 8 DN 200 Recommendation: B2B08AABD-B1CU11-SV-F-SS LW8MBT200AANAT/L-B1CU11-SV T = Switching valve construction Not required with new Lo-Solids Cooking technology. Tag # LV-16 X Two Vessel System X Single Vessel System No. 1 Flash Tank Level Foamy Black Liquor Control Valve LV-16 is located in the line between the No. 1 and No. 2 flash tanks. Tag LV-16 controls level in the No. 1 Flash Tank via a control signal from a level controller (LIC) on the No. 1 flash tank. Differential: 2 psid or 0,1 bar Shut-off: 50 psid = 3,4 bar Temp: 260 F = 130 C Flow: gal/min or liters/min Size: 14 DN 350 Recommendation: LW5CBY14AACAT/C-B1C25-ND LW7LBY350AAJAT/K-B1C25-ND Y = Standard H-construction with PTFE Y = Standard H-construction with PTFE APPLICATION REPORT 10/11 3
4 2611/02/04 EN CONTINUOUS DIGESTER Tag # LV-17 X Two Vessel System X Single Vessel System No. 2 Flash Tank Level Control Foamy Black Liquor Control Valve LV-17 is located in the outlet piping of the No. 2 Flash Tank. LV-17 controls the level in the No. 2 Flash Tank via a control signal from a level controller (LIC) on the No. 2 tank. Differential: psid = 0,7-1,4 bar Shut-off: 50 psid or 3,4 bar Temp: 180 F = 82 C Flow: gal/min = liters/min Size: 12 DN 300 Recommendation: LW5CBY12AACAT/C-B1C17-ND-F-SS LW7LBY300AAJA/K-B1C17-ND Y = Standard H-construction with PTFE Y = Standard H-construction with PTFE Tag # PV-10 X Two Vessel System X Single Vessel System Digester Pressure Relief Black Liquor Control Valve PV-10 is used to relieve digester pressure by allowing digester liquor to bleed into the No. 2 flash tank. PV-10 is used only in upset conditions. Shut-off: 210 psid = 14,5 bar Temp: 325 F = 163 C Flow: 2600 gal/min = 9800 liters/min Size: 6 DN 150 Recommendation: M2DA06AP-B1J20-ND M1LA150AP-B1J20-ND Tag # PV-16 X Two Vessel System X Single Vessel System No. 1 Flash Tank Steam Pressure Relief Flash Steam Control Valve PV-16 is located in the flash steam outlet piping of the No. 1 Flash Tank. PV-16 controls the pressure of flash steam recirculated back to the steaming vessel. Differential: 15 psid or 1 bar Shut-off: 30 psid or 2 bar Temp: 250 F or 121 C Flow: lbs/hr = kg/hr Size: 10 DN 250 Recommendation: LW5CBA10AACAT-B1C13-ND-F-SS LW7LBA250AAJAT-B1C13-ND 4 APPLICATION REPORT 10/11
5 CONTINUOUS DIGESTER 2611/02/04 EN Tag # PV-17 X Two Vessel System X Single Vessel System No. 2 Flash Tank Steam Pressure Relief Flash Steam Control Valve PV-17 controls the pressure of the flash steam that is recirculated back to the Chip Bin Activator. Differential: 1 psid = 0,1 bar Shut-off: 30 psid = 2,1 bar Temp: 225 F = 107 C Flow: lbs/hr = kg/hr Size: 16 DN 400 Recommendation: LW5CBA16AACAT-B1C25-ND-F-SS LW7LBA400AAJAT/K-B1C25-ND PV-17 is located in the flash steam outlet piping of the No. 2 flash tank. APPLICATION REPORT 10/11 5
6 APPLICATION REPORT The information provided in this bulletin is advisory in nature, and is intended as a guideline only. For specific circumstances and more detailed information, please consult with your local automation expert at Metso. Metso Automation Inc. Europe, Vanha Porvoontie 229, P.O. Box 304, FI VANTAA, Finland. Tel Fax North America, 44 Bowditch Drive, P.O. Box 8044, Shrewsbury, MA 01545, USA. Tel Fax South America, Av. Independéncia, Iporanga, , Sorocaba-São Paulo Brazil. Tel Fax /49 Asia Pacific, 20 Kallang Avenue, Lobby B, #06-00, PICO Creative Centre, Singapore , Singapore. Tel Fax China, 19/F, the Exchange Beijing, No. 118, Jianguo Lu Yi, Chaoyang Dist, Beijing, China. Tel Fax Middle East, Roundabout 8, Unit AB-07, P.O. Box 17175, Jebel Ali Freezone, Dubai, United Arab Emirates. Tel Fax
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