CN103352385A - 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
- CN103352385A CN103352385A CN2013102651040A CN201310265104A CN103352385A CN 103352385 A CN103352385 A CN 103352385A CN 2013102651040 A CN2013102651040 A CN 2013102651040A CN 201310265104 A CN201310265104 A CN 201310265104A CN 103352385 A CN103352385 A CN 103352385A
- 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.)
- Granted
Links
Images
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 the production technology that boiling and washing combine, relate to specifically and a kind ofly make fibrous raw material produce paper pulp and at wood, the bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy of digestion process filtering stock from separating by chemical reaction; Blowing adopts pump to pump the blowing technology, and heat energy is fully used, and blowing process noiseless and basic non-exhaust emission are energy saving and environment friendly technologies, belong 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, recycling heat energy how, and reducing energy resource consumption is the important content that paper industry is paid close attention to always and studied.
At present, wood, bamboo pulp boiling that China produces per year below 200,000 tons are to adopt traditional vertically digesting technique mostly, 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's 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 the 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's foam many, and foul smell is heavy, does not also reach the suitable environment effect
The 2nd, system's operating process is not recycled fully to the fiber fines of black liquor, causes the 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, and business burden is heavy.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 provides and a kind ofly makes fibrous raw material from separate producing 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 the 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 may further comprise the steps:
1), dress pot operation
Collaborative with wood chip or bamboo chip dress pot with low-pressure saturated steam and recovery black liquor, add the suitable alkali extracting condition of alkali lye maintenance;
2), dip operation
To flood black liquor and alkali lye and add simultaneously digester, the extracting black liquor that when pot dress occured cements out and washs the material in the digester, simultaneously, continuous displace that this operational phase adds first with the dipping liquid of material reaction;
3), low temperature boiling operation
Add black digestion liquid and add heat alkali liquid to digester, with the black liquor of impregnation stage in the digester with add first the black digestion liquid that initial reaction crosses and cement out, and temperature of charge is risen to the temperature approaching with boiling temperature;
4), thermophilic digestion operation
Start the circulating-heating pump according to the boiling temperature setting value, heating material in the pot is carried out 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 simultaneously, reclaims fiber in the black liquor at washing process with filter plant;
6), put the pot operation
Carry out the blowing operation of continous-stable with blowing pump and dilution black liquor pump, slurry in the pot is transported to follow-up pulp storage tower.
Below be further improvement of these options of the present invention:
The operation of dress pot may further comprise the steps:
A, open pot cover valve and start air exhauster first, restart belt conveyor, limit dress pot, limit are with low-pressure steam heating wood chip or bamboo chip, and steam pressure is 0.35～0.45MPa, and the fixed gas of extracting out in the digester with air exhauster separates through cyclone separator discharges;
B,Digester capacity to be charged to 25%～35% the time, start recovery black liquor pump and send into digester from the recovery black liquor that reclaims 90～95 ℃ of black liquor slot suctions, and send into digester from the cold alkali lye of 80～90 ℃ of cold lye tank (vat) suctions with reclaiming black liquor with cold alkali lye measuring pump;
C, when dress pot to high charge level, stop to end 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 namely closes the pot cover valve, the interior material of pot was heated to 90～95 ℃ when the dress pot finished, and the omnidistance time of operation is 20～25min.
Further improve: dip operation may further comprise the steps:
D, close the pot cover valve, start dipping black liquor pump is heated to 130～140 ℃ from the suction of dipping black liquor slot dipping black liquor and after 80～90 ℃ that send into cold lye pump cold alkali lye mixes, send into digester, fully the displacement interior maceration extract that takes the dish out of the pot;
E, at first the black liquor of extractive reaction in the digester is delivered to the outside of reclaiming black liquor slot, directly with sending evaporation pumping at night toward evaporation section, when being back to 90～95 ℃, then switch to reclaim black liquor slot the inboard for dip operation;
F, when continuing to be back to 95～98 ℃ of temperature, then switch on the heat-exchanging pipe for heat-exchanger line through dipping black liquor cooler and hydrothermal exchange;
G, then stop to flood black liquor pump and cold lye pump when total amount of liquid and cold alkali lye amount all reach setting value, then start circulating pump and carry out cocycle 2～3min, the omnidistance time of operation is 25～35min.
Further improve: the low temperature boiling operation may further comprise the steps:
H, startup black digestion liquid pump are mixed with 150～160 ℃ of heat alkali liquids that add from the thermokalite liquid bath from 150～160 ℃ of black digestion liquids of black digestion liquid groove suction and send into digester, the thermokalite amount divides initial and last two parts to add, and the dipping black liquor slot sent into respectively by the black liquor of two kinds of different temperatures that displace in the pot digester and the black digestion liquid groove is stored;
I, after reaching setting value, black liquor amount and thermokalite liquid measure stop the black digestion liquid pump, this process is 20～25min, then insulation reaction 10～15min, start during this time circulating pump and carry out cocycle 3～4min with the temperature of charge in the neat and well spaced pot and flushing sieve plate, temperature when operation stops is lower 2～4 ℃ than boiling design temperature, and the overall process operating time is 30～40min.
Further improve: the thermophilic digestion operation may further comprise the steps:
The temperature of material is set low 2～4 ℃ of maximum temperature than boiling in J, the digester, start circulating pump suction black liquor and directly add hot black liquor to the boiling set temperature value by steam heater with 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 carries out the upper and lower circulation of compartment, after the H-factor that reaches setting, stop immediately the circulating pump end operation, then automatically change the displacement washing operational phase over to.
Further improve: the displacement washing operation may further comprise the steps:
K, startup washing black liquid pump add slurry in the digester displacement washing pot from the washing black liquid of 70～75 ℃ of washing black liquid groove suctions, the displacement washing process is filtered the black liquor recovery fiber that displaces in the digester with the pressure black liquor filter, the fiber that reclaims is sent to pulp storage tower after with the cooler cooling;
The black liquor of L, three kinds of different temperatures that will displace and filter from digester is stored in respectively black digestion liquid groove and dipping black liquor slot; The black liquor that wherein temperature is the highest is used for thermophilic digestion, then stops the washing black liquid pump when mean temperature and amount of liquid all reach setting value in replacing pot.
Further improve: put the pot operation and may further comprise the steps:
M, startup blowing pump and dilution black liquor pump are transported to follow-up pulp storage tower with the dilution of the slurry in the digester, the blowing process is calculated control dilution black liquor amount automatically take blowing concentration value 4.5%～5.0% as the basis, judge whether to put pot smoothly or put clean slurry according to weight of material in blowing house steward pressure reduction and the pot simultaneously, and take online automatically dredging to wash away measure, to be determinedly put clean slurry and then stop blowing pump and dilution black liquor pump, slurry in the 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 pass through the alkali lye heater and enter the heat alkali liquid groove after with Steam Heating.
Further improve: this technique also comprises following black liquor cooling down operation step:
O, washing black liquid are cooled to enter the washing black liquid groove after the uniform temperature through the washing black liquid cooler.
Further improve: the black liquor cooling down operation is further comprising the steps of:
P, the unnecessary black liquor of black digestion liquid groove enter the dipping black liquor slot after cooling off by the alkali lye preheater; After cooling off through dipping black liquor cooler, the unnecessary black liquor of dipping black liquor slot enters the recovery black liquor slot; Systemic circulation utilizes the unnecessary black liquor of process to be sent to evaporation section from reclaiming after black liquor slot suction warp let-off low pressure black liquor filter filters with evaporation black liquor pump, and isolated fiber is sent to the pulp storage tower after the boiling.
The present invention is applicable to needlebush, leaf wood and bamboo, and is poor to the quality requirement of raw material, can single pot the different raw material of boiling or in proportion steaming mixed leaf wood and bamboo.
The comparable routine of technique of the present invention vertical pot batch cooking technique raises the efficiency 30%～40%; Reasonable cyclic utilization system heat energy, a ton slurry steam consumption is not higher than 0.6t; Unscreened yield all improves more than 1% than any boiling technology, reduces about 6 ℃ of maximum temperature of cookings, can effectively reduce steam consumption; Operating process is washed slurry, saves approximately drum vacuum pulp washer; Technological flexibility is strong, and is good to adaptability to raw material, low to the qualification rate requirement of tablet; Noiseless during blowing is substantially without waste steam exhausting; Little to fibre damage, pulp quality is good, and pulp strength is high in identical Kappa number situation; Can obtain the low kappa number slurry, the bleaching drug dosage is few, and pollutional load is light.The invention will be further described below in conjunction with drawings and Examples.
Description of drawings
Accompanying drawingThe 1st, the technological process of the embodiment of the invention is always schemed.
Among the figure: the 1-belt conveyor; 2-pot cover valve; The 3-digester; The 4-cyclone separator; The 5-air exhauster; The 6-circulating pump; The 7-steam heater; 8-reclaims black liquor slot; 9-reclaims the 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; The 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; The 30-coarse slurry pump; 31-alkali lye heater.
The specific embodiment
Embodiment, the digester cycle that the present invention plants according to slurry, generally formed by 3～5 digesters 3, system is supporting public storagetank tank take digester as core, the black liquor of storing different temperatures and different chemical characteristic is the boiling Cyclic Service, also be furnished with simultaneously the equipment such as heat exchanger, heater, exhausting system and black liquor filtration, and adopt advanced reliably automated control technology, with the comprehensive effect of collaborative performance systems technology.
As shown in Figure 1, a kind of wood, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, this technique may further comprise the steps:
1, dress pot operation;
A, open pot cover valve 2 and start air exhauster 5 first, restart belt conveyor 1, the limit fills pot, wood chip or bamboo chip are heated with low-pressure steam in the limit, and steam pressure is 0.35～0.45MPa, discharges from fixed gas process cyclone separator 4 separation of digester 3 interior extractions with air exhauster 5.
B, digester to be charged to 3 volumes 25%～35% the time, start to reclaim black liquor pump 9 and send into digester 3 from the recovery black liquor V11 that reclaim 90～95 ℃ of black liquor slot 8 suctions, and send into digester 3 from the cold alkali lye V12 of 80～90 ℃ of cold lye tank (vat) 10 suctions with the recovery black liquor with cold alkali lye measuring pump 11.
C, when dress pot 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 namely close pot cover valve 2.The interior material of pot approximately was heated to 90～95 ℃ when the dress pot finished, and the omnidistance time of operation is 20～25min.
2, dip operation
D, close pot cover valve 2, startup dipping black liquor pump 14 aspirates the dipping black liquor V21 that is heated to 130～140 ℃ and send into digester 3 after 80～90 ℃ that send into cold lye pump 11 cold alkali lye V22 mixing from dipping black liquor slot 13, replace the extract in taking the dish out of the pot fully.
E, at first the black liquor V23 of digester 3 interior extractive reactions is delivered to the outside of reclaiming black liquor slot 8, directly with sending evaporation pump at night 28 to be sent to evaporation section, reduce saponified internal circulating load in system and reduce foam, the black liquor amount is V23 when being back to 90～95 ℃, then switches to the inboard of reclaiming black liquor slot 8 and is used for dip operation;
F, the black liquor amount is that V24 switches to then that the black liquor amount is that V25 is through dipping black liquor cooler 26 and hydrothermal exchange on the heat-exchanging pipe for heat-exchanger line when continuing to be back to 95～98 ℃ of temperature.
G, when total amount of liquid and cold alkali lye amount all reach setting value, then stop to flood 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 are mixed with 150～160 ℃ of heat alkali liquid V32 that add from thermokalite liquid bath 17 from 150～160 ℃ of black digestion liquid V31 of black digestion liquid groove 15 suctions and send into digester 3, the thermokalite amount divides initial and last two parts to add, its volume is respectively V33 and V34, and the black liquor amount that the alkali lye volume is corresponding is respectively V35 and V36.Dipping black liquor slot 13 sent into respectively by the V37 that displaces in the digester 3 and the black liquor of two kinds of different temperatures of V38 and black digestion liquid groove 15 is stored, reasonably recycle.
I, stop black digestion liquid pump 16 after black liquor amount and thermokalite liquid measure reach setting value, this process is 20～25min, insulation reaction 10～15min then, during start circulating pump 6 and carry out cocycle 3～4min with the temperature of charge in the neat and well spaced pot and flushing sieve plate.Temperature when operation stops is lower 2～4 ℃ than boiling design temperature, and the overall process operating time is 30～40min.
4, thermophilic digestion operation
J, the temperature of digester 3 interior materials is set low 2～4 ℃ of maximum temperature than boiling, start circulating pump 6 suction black liquor and directly add hot black liquor to the boiling set temperature value by steam heater 7 usefulness 1.0～1.2MPa middle pressure steam, 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, guarantee the uniformity of temperature of charge in the pot and the homogeneity of reaction, after the H-factor that reaches setting, stop immediately circulating pump 3 end operations, then automatically change the displacement washing operational phase over to.
5, displacement washing operation
K, startup washing black liquid pump 19 add slurry in the digester 3 displacement washing pots from the washing black liquid V51 of 70～75 ℃ of washing black liquid groove 18 suctions.The displacement washing process is filtered the black liquor recovery fiber that displaces in the digester 3 with pressure black liquor filter 23, be sent to pulp storage tower 22 after the fiber V52 that reclaims is cooled off with cooler 24;
The black liquor of L, V53, the V54 that will displace and filter from digester 3 and three kinds of different temperatures of V55 is stored in respectively black digestion liquid groove 15 and dipping black liquor slot 13 and rationally recycle, and the black liquor V53 that wherein temperature is the highest is used for thermophilic digestion.Then stop washing black liquid pump 19 when displacement mean temperature and amount of liquid in the pot all reach setting value, it operates final temperature should be definite according to the feature of follow-up washing device, example: be that the drum vacuum pulp washer final temperature is 80～85 ℃ such as follow-up washing device; That the Var-nip press final temperature then is 85～90 ℃ such as follow-up washing device.This overall process operating time in stage 25～35min.
6, put the pot operation
M, startup blowing pump 21 and dilution black liquor pump 20 are transported to follow-up pulp storage tower 22 with the dilution of the slurries in the digester 3, the blowing process is calculated control dilution black liquor amount automatically take blowing concentration value 4.5%～5.0% as the basis, judge whether to put pot smoothly or put clean slurry according to weight of material in blowing house steward pressure reduction and the pot simultaneously, and take online automatically dredging to wash away measure, to be determinedly put clean slurry and then stop blowing pump 21 and dilution black liquor pump 20, pulp storage tower 22 interior slurries are 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, carry out heat exchange from the cold alkali lye of cold lye tank (vat) 10 suctions through alkali lye preheater 27 and black digestion liquid with cold alkali lye delivery pump 12, then through entering heat alkali liquid groove 17 after the alkali lye heater 31 usefulness Steam Heating.
8, black liquor cooling down operation
O, washing black liquid are sent into decoction system by washing workshop section, are cooled to enter washing black liquid groove 18 after the uniform temperature through washing black liquid cooler 25.
P, the unnecessary black liquor of black liquor recycle process black digestion liquid groove enter dipping black liquor slot 13 after cooling off by alkali lye preheater 27; Enter after dipping black liquor slot 13 unnecessary black liquor cool off through dipping black liquor cooler 26 and reclaim black liquor slot 8.Systemic circulation utilizes the unnecessary black liquor of process to be sent to evaporation section from reclaiming after black liquor slot 8 suction warp let-off low pressure black liquor filters 29 filter with evaporation black liquor pump 28, and isolated fiber V71 is sent to the pulp storage tower 22 after the 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 take the vacant volume of digester as the basis.The vacant volume of pot is defined as: pot holds the spatial volume that is not occupied by material after filling pot, and computing formula is: the volume (m of pot vacant volume (V)=digester
3Over dry material (T)/material solid cubic content density (T/m in the)-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
3Initial part adds black liquor V36=0.85～0.9 V m
3Decline adds black liquor V35=V31-V36.
4), displacement washing operation;
The dilution gfactor that displacement washing black liquor amount is determined according to washing is the basic calculation setting value, oven dry stock amount * dilution gfactor in oven dry stock amount in slurry concentration in oven dry stock amount in its black liquor amount V51=pot/pot-pot+pot.
B, alkali lye Distribution Calculation are set
The 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 are 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
Enter the dipping black liquor slot behind the cold alkali lye of residual black liquor preheating of digestion process black digestion liquid groove and replenish dipping black liquor amount, the residual black liquor after the recycle of dipping black liquor slot comes warm water or factory's clear water to carry out heat exchange with evaporation, produces hot water and is used for washing workshop section;
The black liquor that the washing section is come comes warm water or factory's clear water to carry out heat exchange according to displacement washing is temperature required with heat exchanger and evaporation, 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:
V2=long-pending – the V21 of the direct heating-condensing water body of V1+V37+V55+ dipping black liquor;
3), reclaim the black liquor slot residual black liquor: V3=V2+V23+V24 – V21
4), send the evaporation black liquor: V4 ≈ V3 – V71.
Claims (10)
1. a wood, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, it is characterized in that: this technique may further comprise the steps:
1), dress pot operation
Collaborative with wood chip or bamboo chip dress pot with low-pressure saturated steam and recovery black liquor, add the suitable alkali extracting condition of alkali lye maintenance;
2), dip operation
To flood black liquor and alkali lye and add simultaneously digester, the extracting black liquor that when pot dress occured cements out and washs the material in the digester, simultaneously, continuous displace that this operational phase adds first with the dipping liquid of material reaction;
3), low temperature boiling operation
Add black digestion liquid and add heat alkali liquid to digester, with the black liquor of impregnation stage in the digester with add first the black digestion liquid that initial reaction crosses and cement out, and temperature of charge is risen to the temperature approaching with boiling temperature;
4), thermophilic digestion operation
Start the circulating-heating pump according to the boiling temperature setting value, heating material in the pot is carried out 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 simultaneously, reclaims fiber in the black liquor at washing process with filter plant;
6), put the pot operation
Carry out the blowing operation of continous-stable with blowing pump and dilution black liquor pump, slurry in the pot is transported to follow-up pulp storage tower.
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: the operation of dress pot may further comprise the steps:
A, open pot cover valve (2) and start air exhauster (5) first, restart belt conveyor (1), wood chip or bamboo chip are heated with low-pressure steam in limit dress pot, limit, steam pressure is 0.35～0.45MPa, separates through cyclone separator (4) from the interior fixed gas of extracting out of digester (3) with air exhauster (5) and discharges;
B,Digester to be charged to (3) volume 25%～35% the time, start recovery black liquor pump (9) and send into digester (3) from the recovery black liquor that reclaims 90～95 ℃ of black liquor slot (8) suctions, and send into digester (3) from the cold alkali lye of 80～90 ℃ of cold lye tank (vat) (10) suctions with reclaiming black liquor with cold alkali lye measuring pump (11);
C, when dress pot 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 namely closes pot cover valve (2), the interior material of pot was heated to 90～95 ℃ when the dress pot finished, and the omnidistance time of operation is 20～25min.
3. a kind of wood according to claim 2, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, it is characterized in that: dip operation may further comprise the steps:
D, close pot cover valve (2), startup dipping black liquor pump (14) aspirates the dipping black liquor that is heated to 130～140 ℃ and send into digester (3) after 80～90 ℃ that send into cold lye pump (11) cold alkali lye mixing from dipping black liquor slot (13), replace the extract in taking the dish out of the pot fully;
E, at first the black liquor of the interior extractive reaction of digester (3) is delivered to the outside of reclaiming black liquor slot (8), directly with sending evaporation pump at night (28) to be sent to evaporation section, when being back to 90～95 ℃, then switching to the inboard of reclaiming black liquor slot (8) and be used for dip operation;
F, when continuing to be back to 95～98 ℃ of temperature, then switch on the heat-exchanging pipe for heat-exchanger line through dipping black liquor cooler (26) and hydrothermal exchange;
G, then stop to flood black liquor pump (14) and cold lye pump (11) when total amount of liquid and cold alkali lye amount all reach setting value, then start circulating pump (6) and carry out cocycle 2～3min, the operation whole process time is 25～35min.
4. a kind of wood according to claim 3, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy is characterized in that: the low temperature boiling operation may further comprise the steps:
H, startup black digestion liquid pump (16) are mixed with 150～160 ℃ of heat alkali liquids that add from thermokalite liquid bath (17) from 150～160 ℃ of black digestion liquids of black digestion liquid groove (15) suction and send into digester (3), the thermokalite amount divides initial and last two parts to add, and the black liquor of two kinds of different temperatures that displace in the digester (3) is sent into respectively dipping black liquor slot (13) and black digestion liquid groove (15) storage;
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, start during this time circulating pump (6) and carry out cocycle 3～4min with the temperature of charge in the neat and well spaced pot and flushing sieve plate, temperature when operation stops is lower 2～4 ℃ than boiling design temperature, and the overall process operating time is 30～40min.
5. a kind of wood according to claim 4, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy is characterized in that: the thermophilic digestion operation may further comprise the steps:
The temperature of J, the interior material of digester (3) is set low 2～4 ℃ of maximum temperature than boiling, start circulating pump (6) suction black liquor and directly add hot black liquor to the boiling set temperature value by steam heater (7) with 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, after the H-factor that reaches setting, stop immediately circulating pump (3) end operation, then automatically change the displacement washing operational phase over to.
6. a kind of wood according to claim 5, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy is characterized in that: the displacement washing operation may further comprise the steps:
K, startup washing black liquid pump (19) add slurry in digester (3) the displacement washing pot from the washing black liquid of 70～75 ℃ of washing black liquid groove (18) suctions, the displacement washing process is filtered the black liquor recovery fiber that displaces in the digester (3) with pressure black liquor filter (23), be sent to pulp storage tower (22) after the fiber (V52) that reclaims is cooled off with cooler (24);
The black liquor of L, three kinds of different temperatures that will displace and filter from digester (3) is stored in respectively black digestion liquid groove (15) and dipping black liquor slot (13); The black liquor that wherein temperature is the highest is used for thermophilic digestion, then stops washing black liquid pump (19) when mean temperature and amount of liquid all reach setting value in replacing pot.
7. a kind of wood according to claim 6, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy is characterized in that: put the pot operation and may further comprise the steps:
M, start blowing pump (21) and dilution black liquor pump (20) dilution of the slurry in the digester (3) is transported to follow-up pulp storage tower (22), the blowing process is calculated control dilution black liquor amount automatically take blowing concentration value 4.5%～5.0% as the basis, judge whether to put pot smoothly or put clean slurry according to weight of material in blowing house steward pressure reduction and the pot simultaneously, and take online automatically dredging to wash away measure, to be determined put clean slurry then stop blowing pump (21) and the dilution black liquor pump (20), the interior slurry of pulp storage tower (22) is sent to follow-up washing workshop section with coarse slurry pump (30), this stages operating overall process 10～15min.
8. a kind of wood according to claim 7, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, it is characterized in that: this technique also comprises following alkali lye heating operation step:
N, carry out heat exchange from the cold alkali lye of cold lye tank (vat) (10) suction through alkali lye preheater (27) and black digestion liquid with cold alkali lye delivery pump (12), then pass through alkali lye heater (31) with entering heat alkali liquid groove (17) after the Steam Heating.
9. a kind of wood according to claim 8, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, it is characterized in that: this technique also comprises following black liquor cooling down operation step:
O, washing black liquid are cooled to enter washing black liquid groove (18) after the uniform temperature through washing black liquid cooler (25).
10. a kind of wood according to claim 9, bamboo raw material energy-conserving and environment-protective replacing and digesting technoloy, it is characterized in that: the black liquor cooling down operation is further comprising the steps of:
P, the unnecessary black liquor of black digestion liquid groove enter dipping black liquor slot (13) after cooling off by alkali lye preheater (27); Enter after the unnecessary black liquor of dipping black liquor slot (13) cools off through dipping black liquor cooler (26) and reclaim black liquor slot (8); Systemic circulation utilizes the unnecessary black liquor of process to be sent to evaporation section from reclaiming after black liquor slot (8) suction warp let-off low pressure black liquor filter (29) filters with evaporation black liquor pump (28), and isolated fiber is sent to the pulp storage tower (22) after the 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 true CN103352385A (en) | 2013-10-16 |
| CN103352385B CN103352385B (en) | 2014-08-06 |
Family
ID=49308793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310265104.0A Active 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) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757961A (en) * | 2013-12-30 | 2014-04-30 | 汶瑞机械(山东)有限公司 | Batch cooking device and liquid distribution method thereof |
| CN103757962A (en) * | 2013-12-30 | 2014-04-30 | 汶瑞机械(山东)有限公司 | Batch cooking slurry discharge device and slurry discharge method thereof |
| CN104452389A (en) * | 2014-11-04 | 2015-03-25 | 中国轻工业南宁设计工程有限公司 | Energy-saving pulping cooking sequence interlock control system |
| CN106996050A (en) * | 2017-04-20 | 2017-08-01 | 四川省犍为凤生纸业有限责任公司 | A kind of bamboo wood slurrying displacement cooking method |
| CN107858847A (en) * | 2017-12-19 | 2018-03-30 | 安县纸业有限公司 | One kind retains string ecosystem steaming plant and its technique |
| CN108385430A (en) * | 2016-12-20 | 2018-08-10 | 常州爱上学教育科技有限公司 | Slurry made of the higher wood of intensity, bamboo raw material |
| 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 |
| 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 |
| 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 |
| CN111350092A (en) * | 2020-04-20 | 2020-06-30 | 王桂林 | Pulping continuous cooking method and device |
| CN113882180A (en) * | 2021-08-27 | 2022-01-04 | 四川天竹竹资源开发有限公司 | Low-temperature replacement cooking method for bamboo kraft pulp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002042551A1 (en) * | 2000-11-24 | 2002-05-30 | Metso Paper, Inc. | Method for alkaline batch cooking of fiber material |
| 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 |
-
2013
- 2013-06-28 CN CN201310265104.0A patent/CN103352385B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002042551A1 (en) * | 2000-11-24 | 2002-05-30 | Metso Paper, Inc. | Method for alkaline batch cooking of fiber material |
| 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 (1)
| Title |
|---|
| 黄干强: "RDH蒸煮原理与技术", 《广东造纸》 * |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757961A (en) * | 2013-12-30 | 2014-04-30 | 汶瑞机械(山东)有限公司 | Batch cooking device and liquid distribution method thereof |
| CN103757962A (en) * | 2013-12-30 | 2014-04-30 | 汶瑞机械(山东)有限公司 | Batch cooking slurry discharge device and slurry discharge 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 |
| 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 |
| CN104452389A (en) * | 2014-11-04 | 2015-03-25 | 中国轻工业南宁设计工程有限公司 | Energy-saving pulping cooking sequence interlock control system |
| CN108560302A (en) * | 2016-12-20 | 2018-09-21 | 丁永新 | Using the higher slurry of intensity made of wood, bamboo raw material |
| CN108385430A (en) * | 2016-12-20 | 2018-08-10 | 常州爱上学教育科技有限公司 | Slurry made of the higher wood of intensity, bamboo raw material |
| CN108611896A (en) * | 2016-12-20 | 2018-10-02 | 丁永新 | Using paper grade (stock) slurry made of wood, bamboo raw material |
| CN108642944A (en) * | 2016-12-20 | 2018-10-12 | 常州爱上学教育科技有限公司 | Wood, bamboo raw material energy conservation and environmental protection replacing and digesting technoloy |
| CN108867131A (en) * | 2016-12-20 | 2018-11-23 | 常州爱上学教育科技有限公司 | Wood, bamboo raw material energy conservation and environmental protection replacing and digesting technoloy for pulping and paper-making |
| 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 |
| CN106996050A (en) * | 2017-04-20 | 2017-08-01 | 四川省犍为凤生纸业有限责任公司 | A kind of bamboo wood slurrying displacement cooking method |
| CN107858847A (en) * | 2017-12-19 | 2018-03-30 | 安县纸业有限公司 | One kind retains string ecosystem steaming plant and its technique |
| 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 |
| CN111350092A (en) * | 2020-04-20 | 2020-06-30 | 王桂林 | Pulping continuous cooking method and device |
| CN111350092B (en) * | 2020-04-20 | 2022-01-18 | 王桂林 | Pulping continuous cooking method and device |
| CN113882180A (en) * | 2021-08-27 | 2022-01-04 | 四川天竹竹资源开发有限公司 | Low-temperature replacement cooking method for bamboo kraft pulp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103352385B (en) | 2014-08-06 |
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 | |
| CN102140173B (en) | Method for producing sodium lignin sulfonate by using black liquor from pulping of reed containing sodium sulfite | |
| 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 | |
| US3035963A (en) | Process for the continuous digestion of cellulosic materials | |
| CN102337693B (en) | Process for stewing and washing dissolving pulp | |
| CN102251425B (en) | Paper pulp continuous-replacement boiling process | |
| CN106192510A (en) | A kind of phragmites communis starting pulps interval displacement cooking production system and method | |
| CN201809189U (en) | Waste slashing water recycling system | |
| CN207891640U (en) | A kind of system that biomass carbon is prepared by black liquid | |
| CN102454133B (en) | Pulping agent and application and production method thereof | |
| CN102277768B (en) | High-temperature and high-concentration extraction device and method for pulping black liquor | |
| CN104404804B (en) | A kind of chemical pulp or dissolving pulp preparation method and test-type displacement cooking device thereof | |
| CN101100818B (en) | Pulping technique for straw fibre | |
| CN102704298B (en) | Process and device for pulping by reversely extracting grass raw materials | |
| CN103194923B (en) | A kind of use founds the preparation method that pot alkaline cooking exempts to cut rice wheat straw | |
| CN1566520A (en) | Pulping process by acid catalyzed ethanol method | |
| CN110128676A (en) | A kind of method and its application for slightly refining lignin in stalk using oxygen catalytic ethyl alcohol | |
| CN103147332B (en) | Tri-displacement cooking method | |
| CN205775588U (en) | A kind of displacement cooking system of vegetable-fibre slurry |
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 |