CN103352385B - Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials - Google Patents
Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials Download PDFInfo
- Publication number
- CN103352385B CN103352385B CN201310265104.0A CN201310265104A CN103352385B CN 103352385 B CN103352385 B CN 103352385B CN 201310265104 A CN201310265104 A CN 201310265104A CN 103352385 B CN103352385 B CN 103352385B
- Authority
- CN
- China
- Prior art keywords
- black liquor
- pump
- black
- pot
- digester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000008569 process Effects 0.000 title claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 29
- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 20
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 20
- 241001330002 Bambuseae Species 0.000 title claims abstract description 20
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 20
- 239000011425 bamboo Substances 0.000 title claims abstract description 20
- 239000002023 wood Substances 0.000 title claims abstract description 17
- 239000002994 raw material Substances 0.000 title claims abstract description 16
- 238000010411 cooking Methods 0.000 title abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 64
- 238000007598 dipping method Methods 0.000 claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 81
- 239000003513 alkali Substances 0.000 claims description 63
- 230000029087 digestion Effects 0.000 claims description 47
- 238000009835 boiling Methods 0.000 claims description 37
- 239000002002 slurry Substances 0.000 claims description 32
- 238000007664 blowing Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000010790 dilution Methods 0.000 claims description 17
- 239000012895 dilution Substances 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 17
- 238000001704 evaporation Methods 0.000 claims description 16
- 230000008020 evaporation Effects 0.000 claims description 16
- 238000011084 recovery Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 11
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 8
- 230000004087 circulation Effects 0.000 claims description 6
- 102100030386 Granzyme A Human genes 0.000 claims description 5
- 101001009599 Homo sapiens Granzyme A Proteins 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 241000196324 Embryophyta Species 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000001839 systemic circulation Effects 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229920001131 Pulp (paper) Polymers 0.000 abstract description 4
- 239000003814 drug Substances 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000004061 bleaching Methods 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000001914 filtration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 241001343274 Dichrostachys spicata Species 0.000 description 1
- 238000006424 Flood reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002803 maceration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 102220168497 rs113022949 Human genes 0.000 description 1
- 102220210023 rs11549193 Human genes 0.000 description 1
- 102220043733 rs147268650 Human genes 0.000 description 1
- 102220059973 rs189583426 Human genes 0.000 description 1
- 102220008453 rs193922099 Human genes 0.000 description 1
- 102220024204 rs397515480 Human genes 0.000 description 1
- 102220013118 rs397516477 Human genes 0.000 description 1
- 102220266834 rs41268213 Human genes 0.000 description 1
- 102220099085 rs58263806 Human genes 0.000 description 1
- 102220043339 rs587781037 Human genes 0.000 description 1
- 102220054061 rs727505034 Human genes 0.000 description 1
- 102220128888 rs886045414 Human genes 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Landscapes
- Paper (AREA)
Abstract
The invention discloses an energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials. The process comprises the following steps of: carrying out (1) pot filling operation, (2) dipping operation, (3) low-temperature stewing operation, (4) high-temperature stewing operation, (5) displacement washing operation and (6) pot dumping operation. Compared with the conventional vertical pot batch cooking process, the process disclosed by the invention has the advantages that the efficiency is improved by 30-40%; the thermal energy of a system is reasonably and circularly utilized, the steam consumption of a ton of pulp is not higher than 0.6 ton; the coarse pulp yield is improved by 1% than any stewing technique, the maximal stewing temperature is lowered by about 6 DEG C, and the steam consumption can be effectively reduced; the pulp is washed in the operation process, the process flexibility is strong, the adaptability of raw materials is good, and the requirement on percent of pass of tablets is low; in a pulp dumping process, no noise is made, and basically no exhaust steam is discharged; the damage on fibers is little, the quality of final pulp is good, and the strength of paper pulp is high under a same kappa number condition; and the low-kappa-number pulp can be obtained, the use level of bleaching medicines is low, and the pollution load is light.
Description
Technical field
The present invention relates to a kind of bamboo or timber be carried out to the production technology that boiling and washing combine, relate to specifically and a kind ofly make fibrous raw material dissociation produce paper pulp wood, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy at digestion process filtering stock by chemical reaction; Blowing adopts pump to pump blowing technology, and heat energy is fully used, and blowing process noiseless and basic non-exhaust emission, be energy saving and environment friendly technology, belongs to field of papermaking.
Background technology
At present, the conventional batch cooking of China is the emphasis link of pulping and papermaking processes thermal energy consumption, how recycling heat energy, and reducing energy resource consumption is the important content that paper industry is paid close attention to always and studied.
At present, it is to adopt traditional vertically digesting technique mostly that China produces 200000 tons of following wood, bamboo pulp boilings per year, and the complete heat of boiling is spurted slurry.Digester cycle is long, and production efficiency is low; Thick slurry Kappa number is high, and the quality of slurry is inconsistent; System heat-energy losses is large, and noise is large, and waste vapour is seriously polluted.
Conventional batch cooking does not have washing function at digestion process to slurry, and medicine utilization is poor and washing device investment is large.
At present, external advanced displacement cooking technology at intermittence has entered Rapid development stage, but cooking principle is basic identical, also has lower column defects:
The one, production process saponified all do not obtain timely collection and treatment, makes system foam many, and foul smell weight, does not also reach suitable environment effect
The 2nd, system operating process is not recycled fully to the fiber fines of black liquor, causes fibre resources waste.
China advanced person's displacement cooking technology at intermittence does not also have the industrialization engineering of independent intellectual property right, mainly relies on import, and project investment is large, business burden weight.Now the maximum temperature of cooking of all kinds of Batch Cooking Technologies of operation is all also higher, and low temperature boiling is the fundamental way that reduces heat energy, is the direction of boiling technology development.
Summary of the invention
The problem to be solved in the present invention is to provide and a kind ofly makes fibrous raw material dissociation produce paper pulp and at wood, the bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy of digestion process filtering stock by chemical reaction; Realize green effect of efficient, energy-conservation and environmental protection, for papermaking enterprise is created larger benefit.
In order to address the above problem, the present invention by the following technical solutions:
A kind of wood, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, this technique comprises the following steps:
1), dress pot operation
Collaborative by wood chip or bamboo chip dress pot with low-pressure saturated steam and recovery black liquor, add alkali lye to keep suitable alkali extracting condition;
2), dip operation
Dipping black liquor and alkali lye are added to digester simultaneously, and the extracting black liquor that when pot dress is occurred cements out and washs the material in digester, meanwhile, continuous displace that this operational phase first adds with the dipping liquid of material reaction;
3), low temperature boiling operation
Add black digestion liquid and add heat alkali liquid to digester, by the black liquor of impregnation stage in digester with first add the black digestion liquid that initial reaction has been crossed to cement out, and temperature of charge is risen to the temperature approaching with boiling temperature;
4), thermophilic digestion operation
Start circulating-heating pump according to boiling temperature setting value, heating material in pot is carried out to insulation reaction to boiling temperature, digestion process is according to the suitable boiling end of H factor control;
5), displacement washing operation
Slurry in the black liquor washing digester of sending here with washing workshop section, meanwhile, fiber in washing process reclaims black liquor with filter plant;
6), put pot operation
The blowing that carries out continous-stable with blowing pump and dilution black liquor pump operates, and slurry in pot is transported to follow-up pulp storage tower.
Below further improvement of these options of the present invention:
The operation of dress pot comprises the following steps:
A, first open pot cover valve and start air exhauster, restart belt conveyor, low-pressure steam heating wood chip or bamboo chip for limit dress pot, limit, steam pressure is 0.35～0.45MPa, separates discharge with air exhauster from the fixed gas of extracting out in digester through cyclone separator;
b,wait be charged to digester capacity 25%～35% time, start and reclaim black liquor pump and send into digester from the recovery black liquor that reclaims 90～95 DEG C of black liquor slot suctions, and send into digester from the cold alkali lye of 80～90 DEG C of cold lye tank (vat) suctions together with recovery black liquor with cold alkali lye measuring pump;
C, when dress pot is to high charge level, stop only dress pot belt conveyor, air exhauster, recovery black liquor pump and cold alkali lye measuring pump, start circulating pump and carry out cocycle, binder 2～3min closes pot cover valve, when dress pot finishes, in pot, material is heated to 90～95 DEG C, and the omnidistance time of operation is 20～25min.
Further improve: dip operation comprises the following steps:
D, close pot cover valve, start dipping black liquor pump and send into digester together with the suction of dipping black liquor slot is heated to the dipping black liquor of 130～140 DEG C and mixes with the cold alkali lye of 80～90 DEG C that send into cold lye pump, completely the displacement interior maceration extract that takes the dish out of the pot;
E, first the black liquor of extractive reaction in digester is delivered to and reclaimed the outside of black liquor slot, directly with sending evaporation pumping at night toward evaporation section, in the time being back to 90～95 DEG C, be switched to the inner side of recovery black liquor slot for dip operation;
F, in the time continuing to be back to 95～98 DEG C of temperature, be switched on heat-exchanging pipe for heat-exchanger line through dipping black liquor cooler and hydrothermal exchange;
G, in the time that total amount of liquid and cold alkali lye amount all reach setting value, stop flooding black liquor pump and cold lye pump, then start circulating pump and carry out cocycle 2～3min, the omnidistance time of operation is 25～35min.
Further improve: low temperature boiling operation comprises the following steps:
H, startup black digestion liquid pump are mixed and send into digester with 150～160 DEG C of heat alkali liquids that add from thermokalite liquid bath from 150～160 DEG C of black digestion liquids of black digestion liquid groove suction, thermokalite amount divides initial and last two parts to add, and sends into respectively dipping black liquor slot and the storage of black digestion liquid groove from the black liquor of two kinds of different temperatures displacing in pot digester;
I, after reaching setting value, black liquor amount and thermokalite liquid measure stop black digestion liquid pump, this process is 20～25min, then insulation reaction 10～15min, starting during this time circulating pump carries out cocycle 3～4min with the temperature of charge in neat and well spaced pot and rinses sieve plate, temperature when operation stops is lower 2～4 DEG C than boiling design temperature, and the overall process operating time is 30～40min.
Further improve: thermophilic digestion operation comprises the following steps:
In J, digester, the temperature of material is lower 2～4 DEG C than boiling setting maximum temperature, starting circulating pump suction black liquor uses 1.0～1.2MPa middle pressure steam directly to add hot black liquor to boiling set temperature value by steam heater, heating-up time is 5～10min, then carry out insulation reaction, the automatic controlled circulation pump of insulating process carries out the upper and lower circulation of compartment, when stopping immediately circulating pump end operation after the H-factor that reaches setting, then automatically proceed to the displacement washing operational phase.
Further improve: displacement washing operation comprises the following steps:
K, startup washing black liquid pump add slurry in digester displacement washing pot from the washing black liquid of 70～75 DEG C of washing black liquid groove suctions, displacement washing process is filtered the black liquor recovery fiber from displacing in digester with pressure black liquor filter, is sent to pulp storage tower after the fiber of recovery is cooling with cooler;
L, by the black liquor of three kinds of different temperatures that displace from digester and filtered be stored in respectively black digestion liquid groove and dipping black liquor slot; The black liquor that wherein temperature is the highest is for thermophilic digestion, when displacement all reaches and stops washing black liquid pump while setting value to mean temperature in pot and amount of liquid.
Further improve: put pot operation and comprise the following steps:
The slurry dilution in digester is transported to follow-up pulp storage tower by M, startup blowing pump and dilution black liquor pump, blowing process carries out automatically calculating the dilution black liquor amount of controlling taking blowing concentration value 4.5%～5.0% as basis, judge whether to put pot smoothly or put clean slurry according to weight of material in blowing house steward pressure reduction and pot simultaneously, and take online dredging automatically to wash away measure, to be determinedly put clean slurry and stop blowing pump and dilution black liquor pump, slurry in pulp storage tower is sent to follow-up washing workshop section with coarse slurry pump, this stages operating overall process 10～15min.
Further improve: this technique also comprises following alkali lye heating operation step:
N, aspirate cold alkali lye with cold alkali lye delivery pump from cold lye tank (vat) and carry out heat exchange through alkali lye preheater and black digestion liquid, then through alkali lye heater with entering heat alkali liquid groove after Steam Heating.
Further improve: this technique also comprises following black liquor cooling down operation step:
O, washing black liquid enter washing black liquid groove after washing black liquid cooler is cooled to uniform temperature.
Further improve: black liquor cooling down operation is further comprising the steps of:
After black liquor that P, black digestion liquid groove are unnecessary is cooling by alkali lye preheater, enter dipping black liquor slot; The unnecessary black liquor of dipping black liquor slot enters recovery black liquor slot after dipping black liquor cooler is cooling; Systemic circulation utilizes the unnecessary black liquor of process evaporation black liquor pump to be sent to evaporation section from reclaiming black liquor slot suction warp let-off low pressure black liquor filter filters, and isolated fiber is sent to the pulp storage tower after boiling.
The present invention is applicable to needlebush, leaf wood and bamboo, poor to the quality requirement of raw material, can single pot the different raw material of boiling or steaming mixed leaf wood and bamboo in proportion.
The comparable routine of technique of the present invention vertical pot batch cooking technique raises the efficiency 30%～40%; Rationally cyclic utilization system heat energy, ton slurry steam consumption is not higher than 0.6t; Unscreened yield all improves more than 1% than any boiling technology, reduces by 6 DEG C of left and right of maximum temperature of cooking, can effectively reduce steam consumption; Operating process is washed slurry, saves approximately drum vacuum pulp washer; Technological flexibility is strong, good to adaptability to raw material, requires low to the qualification rate of tablet; Noiseless when blowing, substantially without waste steam exhausting; Little to fibre damage, pulp quality is good, and in identical Kappa number situation, pulp strength is high; Can obtain low kappa number slurry, bleaching drug dosage is few, and pollutional load is light.Below in conjunction with drawings and Examples, the invention will be further described.
Brief description of the drawings
accompanying drawingthe 1st, the technological process of the embodiment of the present invention is always schemed.
In figure: 1-belt conveyor; 2-pot cover valve; 3-digester; 4-cyclone separator; 5-air exhauster; 6-circulating pump; 7-steam heater; 8-reclaims black liquor slot; 9-reclaims black liquor pump; The cold lye tank (vat) of 10-; The cold alkali lye measuring pump of 11-; The cold alkali lye delivery pump of 12-; 13-floods black liquor slot; 14-dipping black liquor pump; 15-black digestion liquid groove; 16-black digestion liquid pump; 17-thermokalite liquid bath; 18-washing black liquid groove; 19-washing black liquid pump; 20-dilution black liquor pump; 21-blowing pump; 22-pulp storage tower; 23-high pressure black liquor filter; 24-screenings cooler; 25-washing black liquid cooler; 26-dipping black liquor cooler; The white liquid preheater of 27-; 28-send evaporation black liquor pump; 29-low pressure black liquor filter; 30-coarse slurry pump; 31-alkali lye heater.
Detailed description of the invention
Embodiment, the digester cycle that the present invention plants according to slurry, generally formed by 3～5 digesters 3, system is taking digester as the supporting public storagetank tank of core, the black liquor of storage different temperatures and different chemical characteristic is boiling Cyclic Service, also be furnished with the equipment such as heat exchanger, heater, exhausting system and black liquor filtration, and adopt advanced automated control technology reliably, to work in coordination with comprehensive effect of performance systems technology simultaneously.
As shown in Figure 1, Yi Zhongmu, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, this technique comprises the following steps:
1, dress pot operation;
A, first open pot cover valve 2 and start air exhauster 5, restart belt conveyor 1, for limit dress pot, limit, low-pressure steam heats wood chip or bamboo chip, and steam pressure is 0.35～0.45MPa, uses air exhauster 5 to separate and discharge through cyclone separator 4 from the fixed gas of digester 3 interior extractions.
B, wait be charged to digester 3 volumes 25%～35% time, start and reclaim black liquor pump 9 aspirates 90～95 DEG C recovery black liquor V11 from reclaiming black liquor slot 8 and send into digester 3, and aspirate the cold alkali lye V12 of 80～90 DEG C with cold alkali lye measuring pump 11 from cold lye tank (vat) 10 and send into digester 3 together with recovery black liquor.
C, when dress pot is to high charge level, stop a dress pot belt conveyor 1, air exhauster 5, reclaim black liquor pump 9 and cold alkali lye measuring pump 11, start circulating pump 6 and carry out cocycle binder 2～3min and close pot cover valve 2.When dress pot finishes, in pot, material is approximately heated to 90～95 DEG C, and the omnidistance time of operation is 20～25min.
2, dip operation
D, close pot cover valve 2, start dipping black liquor pump 14 and send into digester 3 together with 13 suctions of dipping black liquor slot are heated to the dipping black liquor V21 of 130～140 DEG C and mix with the cold alkali lye V22 of 80～90 DEG C that send into cold lye pump 11, completely the displacement interior extract that takes the dish out of the pot.
E, first the black liquor V23 of digester 3 interior extractive reactions is delivered to and reclaim the outside of black liquor slot 8, directly with sending evaporation pump at night 28 to be sent to evaporation section, reduce the saponified internal circulating load in system and reduce foam, in the time being back to 90～95 DEG C, black liquor amount is V23, is switched to the inner side of reclaiming black liquor slot 8 for dip operation;
F, in the time continuing to be back to 95～98 DEG C of temperature, black liquor amount is that to be switched to black liquor amount on heat-exchanging pipe for heat-exchanger line be that V25 is through dipping black liquor cooler 26 and hydrothermal exchange to V24.
G, in the time that total amount of liquid and cold alkali lye amount all reach setting value, stop flooding black liquor pump 14 and cold lye pump 11, then start circulating pump 6 and carry out cocycle 2～3min.The omnidistance time of operation is 25～35min.
3, low temperature boiling operation.
H, startup black digestion liquid pump 16 aspirate 150～160 DEG C of black digestion liquid V31 from black digestion liquid groove 15 and are mixed and send into digester 3 with 150～160 DEG C of heat alkali liquid V32 that add from thermokalite liquid bath 17, thermokalite amount divides initial and last two parts to add, its volume is respectively V33 and V34, and the black liquor amount that alkali lye volume is corresponding is respectively V35 and V36.Send into respectively dipping black liquor slot 13 and black digestion liquid groove 15 is stored, reasonably recycle from the black liquor of the V37 that displaces in digester 3 and two kinds of different temperatures of V38.
I, after black liquor amount and thermokalite liquid measure reach setting value, stop black digestion liquid pump 16, this process is 20～25min, and then insulation reaction 10～15min starts during this time circulating pump 6 and carries out cocycle 3～4min with the temperature of charge in neat and well spaced pot and rinse sieve plate.Temperature when operation stops is lower 2～4 DEG C than boiling design temperature, and the overall process operating time is 30～40min.
4, thermophilic digestion operation
J, it is low 2～4 DEG C that the temperature of digester 3 interior materials is set maximum temperature than boiling, startup circulating pump 6 aspirates black liquor and directly adds hot black liquor to boiling set temperature value by steam heater 7 use 1.0～1.2MPa middle pressure steams, the condensed water volume that adds steam is V41, heating-up time is 5～10min, then carry out insulation reaction, the automatic controlled circulation pump 6 of insulating process carries out the upper of compartment, lower circulation, ensure the uniformity of temperature of charge and the homogeneity of reaction in pot, when stopping immediately circulating pump 3 end operations after the H-factor that reaches setting, then automatically proceed to the displacement washing operational phase.
5, displacement washing operation
K, start washing black liquid pump 19 and aspirate the washing black liquid V51 of 70～75 DEG C from washing black liquid groove 18 and add slurry in digester 3 displacement washing pots.Displacement washing process is filtered the black liquor recovery fiber from displacing in digester 3 with pressure black liquor filter 23, is sent to pulp storage tower 22 after the fiber V52 of recovery is cooling with cooler 24;
L, the black liquor of the V53, the V54 that displace and filtered from digester 3 and tri-kinds of different temperatures of V55 is stored in respectively to black digestion liquid groove 15 and dipping black liquor slot 13 and rationally recycle, the black liquor V53 that wherein temperature is the highest is for thermophilic digestion.When displacement stops washing black liquid pump 19 in the time that mean temperature and amount of liquid in pot all reach setting value, it operates final temperature should be definite according to the feature of follow-up washing device, example: if follow-up washing device is that drum vacuum pulp washer final temperature is 80～85 DEG C; If follow-up washing device is that Var-nip press final temperature is 85～90 DEG C.This stage overall process operating time 25～35min.
6, put pot operation
The slurry dilution in digester 3 is transported to follow-up pulp storage tower 22 by M, startup blowing pump 21 and dilution black liquor pump 20, blowing process carries out automatically calculating the dilution black liquor amount of controlling taking blowing concentration value 4.5%～5.0% as basis, judge whether to put pot smoothly or put clean slurry according to weight of material in blowing house steward pressure reduction and pot simultaneously, and take online dredging automatically to wash away measure, to be determinedly put clean slurry and stop blowing pump 21 and dilution black liquor pump 20, interior pulp storage tower 22 slurry is sent to follow-up washing workshop section with coarse slurry pump 30.This stages operating overall process 10～15min.
7, alkali lye heating operation
N, aspirate cold alkali lye with cold alkali lye delivery pump 12 from cold lye tank (vat) 10 and carry out heat exchange through alkali lye preheater 27 and black digestion liquid, then after alkali lye heater 31 use Steam Heating, enter heat alkali liquid groove 17.
8, black liquor cooling down operation
O, washing black liquid are sent into decoction system by washing workshop section, enter washing black liquid groove 18 after washing black liquid cooler 25 is cooled to uniform temperature.
After black liquor that P, black liquor recycle process black digestion liquid groove are unnecessary is cooling by alkali lye preheater 27, enter dipping black liquor slot 13; The unnecessary black liquor of dipping black liquor slot 13 enters and reclaims black liquor slot 8 after dipping black liquor cooler 26 is cooling.Systemic circulation utilizes the unnecessary black liquor of process evaporation black liquor pump 28 to be sent to evaporation section from reclaiming black liquor slot 8 aspirates 29 filtrations of warp let-off low pressure black liquor filter, and isolated fiber V71 is sent to the pulp storage tower 22 after boiling.
In above-described embodiment:
The calculating of a, black liquor consumption is set
The operation of dress pot, dip operation and the black liquor addition of low temperature boiling operational phase are all taking the vacant volume of digester as basis.The vacant volume of pot is defined as: after filling pot, pot holds the spatial volume not occupied by material, and computing formula is: the volume (m of the vacant volume of pot (V)=digester
3over dry material (T)/material solid cubic content density (T/m in)-pot
3).
1), dress pot operation: black liquor V11=(0.7～0.8) V m
3.
2), dip operation: black liquor V21=(1.6～1.9) V m
3.
3), low temperature boiling operation:
Black liquor total amount V31=(1.7～2.0) V m
3; Initial part adds black liquor V36=0.85～0.9 V m
3; Decline adds black liquor V35=V31-V36.
4), displacement washing operation;
Displacement washing black liquor amount is basic calculation setting value according to the definite dilution gfactor of washing, oven dry stock amount * dilution gfactor in the interior oven dry stock amount+pot of the interior slurry concentration-pot of oven dry stock amount/pot in its black liquor amount V51=pot.
B, alkali lye Distribution Calculation are set
Alkali lye volume calculates, V alkali (m
3correction coefficient under temperature when)=alkali charge (%) * general assembly pot material oven-dry weight (kg)/alkali lye effectively subtracts concentration (g/L) *.
1) dress pot operation; Alkali lye consumption R1 (%)=0～5.0;
2), dip operation; Alkali charge R2 (%), wood pulp is 25～35; Bamboo pulp is 30～45;
3), low temperature boiling operation; Alkali charge R3 (%)=total alkali charge (R)-R1-R2; Second step alkali charge (R4)=(0.85～0.90) R3; First step alkali charge (R5)=R3-R4;
Fluid balance and setting when c, displacement washing
1), dip operation;
V21+V22-(V-V11-V12)=V23+V24+V25；V23=(0.9～1.0)*（V21+V22）。
2), low temperature boiling operation;
V31+V32=V37+V38；V37=(1.0～1.1)V。
3), displacement washing operation;
V51+V41=V52+V53+V54+V55；V54=(1.4～1.5)V-V53；V53=(1.05～1.1)V；V55=V51-V52-V53-V54+V41。
D, heat comprehensive utilization fluid balance
After the cold alkali lye of residual black liquor preheating of digestion process black digestion liquid groove, enter dipping black liquor slot and supplement dipping black liquor amount, the residual black liquor after the recycle of dipping black liquor slot carrys out warm water with evaporation or factory's clear water carries out heat exchange, produces hot water for washing workshop section;
The black liquor that washing section is come comes warm water or factory's clear water with heat exchanger and evaporation and carries out heat exchange according to displacement washing is temperature required, produces hot water and is used for washing workshop section.
1), black digestion liquid groove residual black liquor:
The direct heating-condensing water volume-V31 of V1=V38+V53+V54+ black digestion liquid;
2), dipping black liquor slot residual black liquor:
The long-pending – V21 of the direct heating-condensing water body of V2=V1+V37+V55+ dipping black liquor;
3), reclaim black liquor slot residual black liquor: V3=V2+V23+V24 – V21
4), send evaporation black liquor: V4 ≈ V3 – V71.
Claims (4)
1. wood, a bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, is characterized in that: this technique comprises the following steps:
1), dress pot operation
Collaborative by wood chip or bamboo chip dress pot with low-pressure saturated steam and recovery black liquor, add alkali lye to keep suitable alkali extracting condition;
2), dip operation
Dipping black liquor and alkali lye are added to digester simultaneously, and the extracting black liquor that when pot dress is occurred cements out and washs the material in digester, meanwhile, continuous displace that this operational phase first adds with the dipping liquid of material reaction;
3), low temperature boiling operation
Add black digestion liquid and add heat alkali liquid to digester, by the black liquor of impregnation stage in digester with first add the black digestion liquid that initial reaction has been crossed to cement out, and temperature of charge is risen to the temperature approaching with boiling temperature;
4), thermophilic digestion operation
Start circulating-heating pump according to boiling temperature setting value, heating material in pot is carried out to insulation reaction to boiling temperature, digestion process is according to the suitable boiling end of H factor control;
5), displacement washing operation
Slurry in the black liquor washing digester of sending here with washing workshop section, meanwhile, fiber in washing process reclaims black liquor with filter plant;
6), put pot operation
The blowing that carries out continous-stable with blowing pump and dilution black liquor pump operates, and slurry in pot is transported to follow-up pulp storage tower;
The operation of dress pot comprises the following steps:
A, first open pot cover valve (2) and start air exhauster (5), restart belt conveyor (1), for limit dress pot, limit, low-pressure steam heats wood chip or bamboo chip, steam pressure is 0.35～0.45MPa, uses air exhauster (5) to separate discharge from the interior fixed gas of extracting out of digester (3) through cyclone separator (4);
b,wait be charged to digester (3) volume 25%～35% time, start and reclaim black liquor pump (9) and send into digester (3) from reclaiming black liquor slot (8) the suction recovery black liquor of 90～95 DEG C, and send into digester (3) from the cold alkali lye of 80～90 DEG C of cold lye tank (vat) (10) suctions together with recovery black liquor with cold alkali lye measuring pump (11);
C, when dress pot is to high charge level, stop dress pot belt conveyor (1), air exhauster (5), reclaim black liquor pump (9) and cold alkali lye measuring pump (11), start circulating pump (6) and carry out cocycle, binder 2～3min closes pot cover valve (2), when dress pot finishes, in pot, material is heated to 90～95 DEG C, and the omnidistance time of operation is 20～25min;
Dip operation comprises the following steps:
D, close pot cover valve (2), start dipping black liquor pump (14) and send into digester (3) together with dipping black liquor slot (13) suction is heated to the dipping black liquor of 130～140 DEG C and mixes with the cold alkali lye of 80～90 DEG C that send into cold lye pump (11), replace the interior extract that takes the dish out of the pot completely;
E, first the black liquor of the interior extractive reaction of digester (3) is delivered to reclaim black liquor slot (8) outside, directly with sending evaporation pump at night (28) to be sent to evaporation section, in the time being back to 90～95 DEG C, be switched to the inner side of reclaiming black liquor slot (8) for dip operation;
F, in the time continuing to be back to 95～98 DEG C of temperature, be switched on heat-exchanging pipe for heat-exchanger line through dipping black liquor cooler (26) and hydrothermal exchange;
G, in the time that total amount of liquid and cold alkali lye amount all reach setting value, stop flooding black liquor pump (14) and cold lye pump (11), then start circulating pump (6) and carry out cocycle 2～3min, the operation whole process time is 25～35min;
Low temperature boiling operation comprises the following steps:
H, startup black digestion liquid pump (16) are mixed and send into digester (3) with 150～160 DEG C of heat alkali liquids that add from thermokalite liquid bath (17) from 150～160 DEG C of black digestion liquids of black digestion liquid groove (15) suction, thermokalite amount divides initial and last two parts to add, and sends into respectively dipping black liquor slot (13) and black digestion liquid groove (15) is stored from the black liquor of two kinds of different temperatures displacing in digester (3);
I, after reaching setting value, black liquor amount and thermokalite liquid measure stop black digestion liquid pump (16), this process is 20～25min, then insulation reaction 10～15min, starting during this time circulating pump (6) carries out cocycle 3～4min with the temperature of charge in neat and well spaced pot and rinses sieve plate, temperature when operation stops is lower 2～4 DEG C than boiling design temperature, and the overall process operating time is 30～40min;
Thermophilic digestion operation comprises the following steps:
It is low 2～4 DEG C that the temperature of J, the interior material of digester (3) is set maximum temperature than boiling, start circulating pump (6) suction black liquor and directly add hot black liquor to boiling set temperature value by steam heater (7) 1.0～1.2MPa middle pressure steam, heating-up time is 5～10min, then carry out insulation reaction, the automatic controlled circulation pump of insulating process (6) carries out the upper and lower circulation of compartment, when stopping immediately circulating pump (3) end operation after the H-factor that reaches setting, then automatically proceed to the displacement washing operational phase;
Displacement washing operation comprises the following steps:
K, startup washing black liquid pump (19) add slurry in digester (3) displacement washing pot from the washing black liquid of 70～75 DEG C of washing black liquid groove (18) suctions, pressure black liquor filter for displacement washing process (23) filters the black liquor recovery fiber from displacing in digester (3), after cooling with cooler (24) fiber (V52) reclaiming, is sent to pulp storage tower (22);
L, by the black liquor of three kinds of different temperatures that displace and filtered from digester (3) be stored in respectively black digestion liquid groove (15) and dipping black liquor slot (13); The black liquor that wherein temperature is the highest is for thermophilic digestion, when displacement all reaches and stops washing black liquid pump (19) while setting value to mean temperature in pot and amount of liquid;
Putting pot operation comprises the following steps:
M, start blowing pump (21) and dilution black liquor pump (20) the slurry dilution in digester (3) is transported to follow-up pulp storage tower (22), blowing process carries out automatically calculating the dilution black liquor amount of controlling taking blowing concentration value 4.5%～5.0% as basis, judge whether to put pot smoothly or put clean slurry according to weight of material in blowing house steward pressure reduction and pot simultaneously, and take online dredging automatically to wash away measure, to be determined put clean slurry stop blowing pump (21) and dilution black liquor pump (20), by interior pulp storage tower (22) for slurry coarse slurry pump (30) be sent to follow-up washing workshop section, this stages operating overall process 10～15min.
2. a kind of wood according to claim 1, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, is characterized in that: this technique also comprises following alkali lye heating operation step:
N, aspirate cold alkali lye with cold alkali lye delivery pump (12) from cold lye tank (vat) (10) and carry out heat exchange through alkali lye preheater (27) and black digestion liquid, then through alkali lye heater (31) with entering heat alkali liquid groove (17) after Steam Heating.
3. a kind of wood according to claim 2, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, is characterized in that: this technique also comprises following black liquor cooling down operation step:
O, washing black liquid enter washing black liquid groove (18) after washing black liquid cooler (25) is cooled to uniform temperature.
4. black liquor cooling down operation is further comprising the steps of:
After black liquor that P, black digestion liquid groove are unnecessary is cooling by alkali lye preheater (27), enter dipping black liquor slot (13); The unnecessary black liquor of dipping black liquor slot (13) enters and reclaims black liquor slot (8) after dipping black liquor cooler (26) is cooling; Systemic circulation utilizes the unnecessary black liquor of process evaporation black liquor pump (28) to be sent to evaporation section from reclaiming black liquor slot (8) suction warp let-off low pressure black liquor filter (29) filters, and isolated fiber is sent to the pulp storage tower (22) after boiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310265104.0A CN103352385B (en) | 2013-06-28 | 2013-06-28 | Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310265104.0A CN103352385B (en) | 2013-06-28 | 2013-06-28 | Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103352385A CN103352385A (en) | 2013-10-16 |
| CN103352385B true CN103352385B (en) | 2014-08-06 |
Family
ID=49308793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310265104.0A Expired - Fee Related CN103352385B (en) | 2013-06-28 | 2013-06-28 | Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103352385B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757962B (en) * | 2013-12-30 | 2016-05-25 | 汶瑞机械(山东)有限公司 | A kind of batch cooking blowing device and blowing method thereof |
| CN103757961B (en) * | 2013-12-30 | 2016-01-20 | 汶瑞机械(山东)有限公司 | A kind of batch cooking device and liquid distributing method thereof |
| CN104452389B (en) * | 2014-11-04 | 2017-02-15 | 中国轻工业南宁设计工程有限公司 | Energy-saving pulping cooking sequence interlock control system |
| CN106400568B (en) * | 2016-12-20 | 2018-09-04 | 抚州市文山竹木加工有限公司 | A kind of wooden, bamboo raw material energy conservation and environmental protection replacing and digesting technoloy |
| CN106996050B (en) * | 2017-04-20 | 2018-06-29 | 四川省犍为凤生纸业有限责任公司 | A kind of bamboo wood slurrying displacement cooking method |
| CN107858847B (en) * | 2017-12-19 | 2023-08-04 | 四川环龙生活用品有限公司 | Device and process for preserving plant fiber original ecology cooking |
| CN108589374A (en) * | 2018-05-22 | 2018-09-28 | 四川省犍为凤生纸业有限责任公司 | A kind of paper pulp manufacturing technique |
| CN111021121A (en) * | 2019-11-06 | 2020-04-17 | 福建省青山纸业股份有限公司 | Production method for directly converting natural-color chemical KP pulp on dissolving pulp DP production line |
| CN110983848A (en) * | 2019-11-06 | 2020-04-10 | 福建省青山纸业股份有限公司 | Preparation process of bamboo unbleached pulp |
| CN111021132A (en) * | 2019-12-27 | 2020-04-17 | 鲍双铭 | Production process for making paper pulp by using corn straws as raw materials |
| CN111350092B (en) * | 2020-04-20 | 2022-01-18 | 王桂林 | Pulping continuous cooking method and device |
| CN113882180B (en) * | 2021-08-27 | 2022-10-14 | 四川天竹竹资源开发有限公司 | Low-temperature replacement cooking method for bamboo kraft pulp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058951A (en) * | 2007-05-17 | 2007-10-24 | 永州湘江纸业有限责任公司 | Method of producing fir chemical pulp |
| CN101100820A (en) * | 2007-06-26 | 2008-01-09 | 永州湘江纸业有限责任公司 | Method for producing Chinese red pine chemical pulp |
| CN102978985A (en) * | 2012-11-26 | 2013-03-20 | 天津市恒脉机电科技有限公司 | Process method for producing paper pulp through intermittent replacement cooking |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20002586A (en) * | 2000-11-24 | 2002-05-25 | Metso Paper Inc | Process for alkaline batching when cooking fiber material |
-
2013
- 2013-06-28 CN CN201310265104.0A patent/CN103352385B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058951A (en) * | 2007-05-17 | 2007-10-24 | 永州湘江纸业有限责任公司 | Method of producing fir chemical pulp |
| CN101100820A (en) * | 2007-06-26 | 2008-01-09 | 永州湘江纸业有限责任公司 | Method for producing Chinese red pine chemical pulp |
| CN102978985A (en) * | 2012-11-26 | 2013-03-20 | 天津市恒脉机电科技有限公司 | Process method for producing paper pulp through intermittent replacement cooking |
Non-Patent Citations (2)
| Title |
|---|
| RDH蒸煮原理与技术;黄干强;《广东造纸》;20000531(第5期);第28-31、48页 * |
| 黄干强.RDH蒸煮原理与技术.《广东造纸》.2000,(第5期),第28-31、48页. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103352385A (en) | 2013-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103352385B (en) | Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials | |
| CN102337689B (en) | Stewing method for preparing bamboo wood dissolving pulp | |
| CN102203342A (en) | A single vertical atmospheric vessel for steaming, slurrying, impregnating and digesting fibrous material | |
| US8795468B2 (en) | Method and system for impregnating chips | |
| CN101100820B (en) | Method for producing Chinese red pine chemical pulp | |
| CN101748635B (en) | Method for preparing slurry by replacement cooking | |
| CN108589374A (en) | A kind of paper pulp manufacturing technique | |
| CN102226319B (en) | Batch cooking cold blow device and cold blow method | |
| CN110128676A (en) | A kind of method and its application for slightly refining lignin in stalk using oxygen catalytic ethyl alcohol | |
| CN106192510A (en) | A kind of phragmites communis starting pulps interval displacement cooking production system and method | |
| CN102051834A (en) | Cold blow process method for replacing heat in cooking process | |
| CN102251425B (en) | Paper pulp continuous-replacement boiling process | |
| CN105664809A (en) | Supercritical drying method of felt/silicon-aluminum aerogel composite insulation board | |
| CN102337693A (en) | Process for stewing and washing dissolving pulp | |
| CN106087539A (en) | A kind of preparation method of clean type pulping agents | |
| CN102251423B (en) | Continuous displacement and digestion process for dissolving pulp | |
| CN201809189U (en) | Waste slashing water recycling system | |
| CN101899795A (en) | Method for improving utilization ratio of chemi-mechanical pulp bleaching filtrate | |
| CN104404804B (en) | A kind of chemical pulp or dissolving pulp preparation method and test-type displacement cooking device thereof | |
| CN102454133B (en) | Pulping agent and application and production method thereof | |
| CN102704298B (en) | Process and device for pulping by reversely extracting grass raw materials | |
| CN204589694U (en) | A kind of reed starting pulps interval displacement cooking production system | |
| CN207891640U (en) | A kind of system that biomass carbon is prepared by black liquid | |
| CN103194923B (en) | A kind of use founds the preparation method that pot alkaline cooking exempts to cut rice wheat straw | |
| CN102277768B (en) | High-temperature high-concentration extraction device and method for pulping black liquor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 |