CN1067080A - The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp - Google Patents
The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp Download PDFInfo
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- CN1067080A CN1067080A CN92102867A CN92102867A CN1067080A CN 1067080 A CN1067080 A CN 1067080A CN 92102867 A CN92102867 A CN 92102867A CN 92102867 A CN92102867 A CN 92102867A CN 1067080 A CN1067080 A CN 1067080A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
Boiling technology is reclaimed in the non-timber chemical pulping of a kind of low-loss and energy-saving, comprise the charging feed liquor, pre-digestion, reclaim 14 procedures such as chemicals, it is characterized in that this slurrying with preimpregnation, precook, the multistage boiling of gas, liquid, raw material and paper pulp multistage thermal diffusion washing exchange for, adopt the recycling of heat energy chemicals closed circulation, to black liquor silicon removing, with black liquor self-energy evaporation and concentration, organic compound combustion decomposes the heat energy chemical recovery.The present device uniqueness, technology advanced person is applicable to various chemical pulping methods and various fibrous raw material vertical, ball formula boiling vessel, can reduce boiling steam consumption quantity 1/2, chemicals consumption 1/4, the harm of black liquor silica is basic to be eliminated, the chemical recovery rate is more than 80%, and three-waste pollution obtains administering.
Description
A kind of boiling chemical recovery technology of non-wood pulping papermaking mainly comprises boiling, and medicine is advanced in charging, stingy, the insulation boiling of row during the even liquid of idle running heats up, and row's atmosphere blowing, black liquid extraction, black liquor vaporizing concentrates, and black-liquor combustion decomposes, technology such as causticization.And boiling vessel, black liquor filters and extracts, and special equipments such as evaporation and concentration, combustion furnace, causticizer are used for non-wood pulping, belong to the papermaking class.
At present, non-timber is paper making raw material, mostly is the rotary spherical digester pulping technique.By the charging feed liquor, ooze medicine idle running, row is stingy in the intensification, thermophilic digestion, six programs such as row's atmosphere blowing.Yet the chemicals of this slurrying, heat energy are disposable boiling technology.Waste gas, waste liquor contamination are serious.Technical economic benefit is poor, and chemicals reclaims and then is divided into black liquid extraction when using the sulfate alkaline process, and black liquor vaporizing concentrates, incineration of liquor, and four steps of green liquor causticizing handle.Neutral Ammonium Sulfite Method black liquor then majority directly bleeds off.
Wherein: 1. sulfate extraction black liquor is divided into: extract after filtration behind the A rotary spherical digester blowing; Behind the B blowing, the extruding of Var-nip press acroll press washer is extracted; Utilize drum-type belt suction washer or pressure vacuum rinsing maching to extract behind the C blowing.
2. black liquor vaporizing concentrates: use long tube, short tube type etc., utilize the method for steam indirect multiple-effect vacuum evaporation.
3. incineration of liquor: use the injecting type stove to be equipped with waste heat boiler and oil is used in the cyclone dust removal evaporation, natural gas, the combustion-supporting burning of coal gas also has the simple and easy injection stove of the no water-cooling wall of use, sets up the assistant coal stove and produce heat, burns helping.
4. causticization is that rare white liquid dissolving alkali stove is emitted melt, and it is heavy clear to add the ash breast through green liquor clarification to the causticization, and heavy clear back becomes strong white liquor on the one hand, send slurrying back to and use, the body refuse washing after will sinking is clearly on the other hand removed slag after filtration, rare white liquid can be made milk of lime on one side, and another side is gone into dissolving tank.
This sulfuric acid process chemical recovery is handled owing to grass, bamboo class non-wood pulping, and paper pulp fiber is generally shorter.Pulp washing and dehydration are difficult, and pentose in the black liquor, dioxide-containing silica is higher, viscosity is big, flowability is poor.Therefore the black liquor loss is big, and it is low to extract black liquid consistency, particularly Sio
2Harm, not only black liquor viscosity increases, the easy fouling of evaporimeter influence evaporation efficiency and evaporation intensity, also wants fouling in conveying black liquor pipeline.In the black-liquor combustion process, the black liquor spray gun can be blocked nozzle by fouling.Curtain fouling in the combustion furnace, the scraper-trough conveyer slotted eye stops up.Flying dust can firmly adhere to furnace wall, tube wall dwindles the burner volume and the exhaust gases passes area also can correspondingly diminish, and influences production efficiency; The heat transfer efficiency and the normal cycle of operation; Not only the CaO consumption increases when causticization, and heavy clear efficient lowers, and CaO reclaims and also is a problem.Though paper plant adopts various measures and equipment on black liquid extraction, extract black liquid consistency only about 6Be.Extraction rate of black liquor is about 70%.And evaporimeter warp acid-alkali washing commonly used, shorten the cycle of operation, influence evaporation efficiency and evaporation intensity, black liquor viscosity directly influences the raising of combustion furnace black liquid consistency greatly again.Because of the black liquor solid caloric value lower than pulp black liquor; When burning, must replenish an amount of liquid, gas, fuel combustion supporting.Assistant coal is combustion-supporting, and not only big, the flying dust of energy consumption can be blown into alkali recovery furnace, and the black liquor of pollution when burning, can make contained SiO in the coal ash
2, Al
2O
3, complicated reaction takes place during burning in MgO etc., increased that the alkali stove is produced and causticization is sunk clear difficulty.CaO can consume more, blowdown flow rate increases, and causes the Na ion to lose in a large number.Simultaneously, owing to contain a large amount of CO in the flue gas that auxiliary burner is produced
2, SO
2Can cause the black liquor carbonating, precipitation occur, cause damage, make alkali recovery about 40%, be difficult to improve.
Pulping with ammonium sulfite method: black liquor is not done chemical treatment, and containing ammonium lignin sulfonate in the general waste liquid is a kind of organic nitrogenous fertilizer.Because the concentration of waste liquid is low, utilize that to handle investment big, the energy consumption height, the expense height, enterprise does not have economic benefit, so directly enter rivers, lake, cause environment, pollution of waterhead.
The rotary spherical digester of digesting apparatus is that smooth ball, bin gate, an end admission, the other end are for spurting material and exhaust in the existing slurrying.Because adopt middle heating, gas distribution, cause medium temperature height in the ball.The metal of ball wall, heat radiation towards periphery forms the big temperature difference of inner raw material and outer raw material, adds the smooth ball wall, and rotary spherical digester can form on the wall of feed liquid in ball when changeing and slide, and feed liquid mixes ability, the soup skewness, time-consuming efficient is low.Center cloth vapour transverse tube is subjected to the effect of feed liquid, also can fracture sometimes, and slurry, medicine and quality are had certain influence.
The equipment of existing black liquid extraction and black liquor vaporizing only is applicable to wood pulp.Because SiO in the non-wood pulping waste liquid
2The content height, viscosity is big, and mobile poor, fiber finer is short, causes the filtration washing difficulty, causes the black liquid extraction concentration-temperature all low.Deal with problems, need huge equipment investment.In general, the small paper mill waste liquid reclaims and pollution control is difficult to realize.Add that pulping process and recovery technology need a large amount of steam and power.The combustion chemistry product reclaim the problem that oil, natural gas and coal gas fuel also must be provided.Reclaim alkali cost height, can not receive distinct economic.Therefore, in, small paper mill do not have enthusiasm to existing recovery technology, polluted, influenced the development of paper industry to environment.
Purpose of the present invention is to provide a kind of " new technology of boiling is reclaimed in the non-timber chemical pulping of low-loss and energy-saving " can overcome the chemical recovery of the non-timber pulping by cooking of above-mentioned paper industry technical process defective and waste liquid, contaminated solution problem.Be applicable to the plurality of raw materials classification, as bamboo class, grass, bast class, seed hairs etc. and various chemical pulping methods as alkaline process, sulphite process, pure method, ammonia salt method etc.Can need to adjust each program and Production Time according to producing, chemical recovery utilization ratio height, consume few, the energy savings of medicine, the production efficiency height, paper pulp physical index height, pulping yield height, three-waste pollution obviously obtain administering, saving the slurrying cost greatly, and economic benefit and social benefit are obvious.
The invention is characterized in that the non-timber chemical pulping of low-loss and energy-saving reclaims the pulping by cooking process of boiling new technology: adopt that preimpregnation is precooked, the multistage boiling of gas phase, liquid phase.Raw material and the diffusion of paper pulp multistage exchange washing for.The recycling of heat energy closed circulation and chemicals, black liquor silicon removing, high temperature black liquor self energy evaporation and concentration.Organic matter self energy combustion decomposition, chemical recovery are utilized new technology.By 1. boiling vessels charging feed liquor; 2. preimpregnation washing; 3. gas phase boiling; 4. liquid phase cooking; 5. black liquor silicon removing; 6. the heat energy of high temperature black liquor self energy evaporation and condensate liquid are recycled; 7. the heat energy and the chemical recovery of black liquor organic matter self energy combustion decomposition; 8. advancing medicine heats up; 9. insulation boiling; 10. warm black liquor exchanges the high temperature black liquor for; 11. high temperature black liquor causticization; 12. rare black liquor exchanges warm black liquor for; 13. blowing filters rare black liquor; 14. press filtration extracts residual solution.Wherein: 1. rotary spherical digester charging feed liquor: for from boiling, exchanging warm black liquor in the hopper of coming in and going out last time for; 2. preimpregnation washing: after being warm black liquor goal, rotate rotary spherical digester, make tablet phase mutual friction in warm black liquor, and at a certain temperature, dipping and washing.To expect sticky material and bring silt particle, dust into that the wet disengaging of splashing enters and embathes in the liquid and remove.3. gas phase boiling: be when eliminating is embathed liquid and gone into warm black liquor stillpot, provide secondary steam input rotary spherical digester, realize tablet gas phase boiling in short-term by high temperature black liquor causticizing tank.4. liquid phase is precooked: be to store last time into the whole high temperature black liquor input rotary spherical digesters of high temperature black liquor groove through causticization, under big liquor ratio low pressure condition, keep certain hour, after tablet implemented the black liquor liquid phase and precook, the liquid of all precooking entered the hot black liquor stillpot, and residual air enters dipper.5. black liquor silicon removing: be with high temperature black liquor causticizing tank, warm black liquor stillpot is store liquid in the hot black liquor stillpot three-flute, washes in the mud sump through staticly settling the body refuse in bottom land, all entering.Add rare black liquor or evaporator condensation liquid then, dilution washing, organic matter and alkali part in the stripping body refuse.Then, regain lysate, remove foreign material such as silicon mud through centrifugal separator.6. elevated temperature heat black liquor self energy evaporation and concentration, hot and cold lime set are recycled: be with the silica removal hot black liquor of precooking, send into the flash distillation filter and utilize secondary vapour by free falling-film evaporation indirect black liquor.Promptly need not replenish initial steam, utilize again, black liquor can be concentrated into 30% above solid content with the self-contained thermogravimetric of black liquor.When black liquor is gone into the flash distillation filter, add an amount of NaOH with regulation and control PH, reduction black liquor viscosity, improve evaporation efficiency and prevent the heating of combustion furnace tail gas carbonating to occur and precipitate.The evaporimeter indirect steam is handled gained hot water through heat exchange and is used for washing pulp.The dirty hot water of gained condensation is used for pre-digestion and dilution silica removal body refuse.In use during the property pulping with ammonium sulfite method, contain ammonia composition height in the dirty hot water of condensation, as the recycling of buffer preparation cooking liquor.7. black liquor organic matter self energy combustion decomposition, heat energy and chemical recovery: by self energy evaporation 30% above concentration black liquor, improve temperature through preheater and reenter evaporimeter, increase black liquor with combustion furnace tail gas Direct Contact Heating and continue evaporation efficiency, black liquid consistency is reached to spray into the burning of stove inner drying more than 45%.Because wind-warm syndrome is to utilize body of heater heat radiation, furnace temperature stable, the silica removal black liquor viscosity reduces, and it is good to go into furnace black liquid spray pattern.Do not need makeup oil, gas fuel to reach the combustion decomposition purpose, the organic compound combustion heat produces steam by waste heat boiler, can satisfy and reclaim boiling steam needs, and tail gas contains SO after continuing to be evaporated the black liquor utilization in the tail gas
2Deng composition, absorb SO with rare cold white shower again
2, generate Na
2SO
3Returning boiling uses.When chemical recovery, when being divided into two class situation: a, use bases legal system slurry, fused mass is dissolved into behind the green liquor again with reactor with rare white liquid behind (the inferior sodium method of soda processes combustion alkali-AQ sulfate process and alkali) incineration of liquor, replace lime slaking, green liquor causticizing, white liquid is heavy clear, obtains strong white liquor (alkali) and replys the pulping by cooking utilization.The washing and filtering white clay to sneak into an amount of coal dust, is calcined in postforming through storing up wind, as building materials again quick lime (as system clinker brick etc.) use.B, use neutral Ammonium Sulfite Method, during ammonia salt legal system slurry, be in the boiling sealing circulation technology, do not have large and small gas discharging, the volatile chemical loss reduces.Black liquor is by the self energy evaporation and concentration, and double evaporation-cooling vapour is subjected to abundant condensation, and ammonia, sulphur can obtain reclaiming multiplexing.Neutral black liquor of imonium burning back tail gas water cooling and absorbing promptly gets NH
4HSO
3(NH
4)
2SO
3Liquid is used for slurrying.Or with black liquor of imonium by after the self energy evaporation, utilize the steam boiler tail to be evaporated to 50% above concentration black liquor more again and spray into steam boiler and make fuel.Also 50% concentration black liquor can be provided and make fertilizer.Or add 50% calcium magnesium ground phosphate rock and make organic complex solid fertilizer.Also 50% concentration black liquor modulating adhesive can be used.8. advancing medicine heats up: be that the white liquid of chemical recovery is sent into rotary spherical digester through the cooking liquor of preparation preheating, temperature heats up on demand.Because tablet digestion processing in advance, tablet hot water DDGS, 1% NaOH DDGS, part lignin and tablet are sticky, and quilts such as silt, mould, heteroproteose cell, fat, cured, glue take off in the pre-digestion liquid and remove.The interior temperature of rotary spherical digester this moment can effectively reduce the chemicals consumption and shorten the heating-up time still more than 100 ℃.9. insulation boiling: be the removal of wet splash softening and DDGS of tablet in the ball.The gas distribution of rotary spherical digester and anti-skidding dredge turn over, have strengthened mixed expansion of tablet liquid and ooze.Liquor strength with make a gesture of measuring relative rising.Promote all even steaming of boiling to separate speed and accelerate, realize high speed cooking.10, warm black liquor exchanges the high temperature black liquor for; Be during terminal point, warm black liquor to be sent into by rotary spherical digester axle one end, take out with high temperature Normal juice black liquor more than 150 ℃, enter high temperature black liquor causticizing tank from the ball journal other end in insulation, through the black liquor of causticization for the next liquid phase usefulness of precooking.11. black liquor causticization: be to make the milk of lime that sieves in advance, contain SiO by black liquor
2Necessarily make a gesture of measuring and add in the causticizing tank same Na
2SiO
3Reaction becomes non-dissolubility CaSiO
3Be sunken to bottom land, black liquor has increased effective alkali part after the desiliconization, and feed flow is precooked mutually, improves the effect of precooking.12. rare black liquor exchanges warm black liquor for: be that black liquor in rare black liquor groove is sent into rotary spherical digester from ball journal one end, take out warm black liquor from the other end and enter warm black liquor groove, use for next preimpregnation washing, 13. blowing filters rare black liquor: be after in ball, exchanging the washing end for, to rotate rotary spherical digester immediately, open bin gate, emit slurries and go into filtering ponds, with partly residual black liquor flushing, filtration obtains rare black liquor and changes in rare black liquor groove, uses for exchanging warm black liquor next time for.14. remaining black liquor is extracted in press filtration: be to pour stock tank against filtering slurry with remaining black liquor.Allow paper pulp contain the raffinate diffusion dissolution, deliver to filter press then and add evaporimeter recovery hot water, slurries are through press filtration, and the raffinate of obtaining exchanges the retrograde multiplexing of liquid for for each section.More than the total extraction rate reached to 90% of black liquor, the paper pulp mass dryness fraction reaches 25-30%, supplies with the overall process of screening, purify, bleach, finish slurrying.
The special equipment of boiling new technology is reclaimed in the non-timber chemical pulping of low-loss and energy-saving, its feature comprises liquid causticizing tank in rotary spherical digester in the decoction system that contains closed circulation black liquor causticization silica removal and the high temperature, flash distillation filter and free falling-film evaporimeter, air-jacketed black liquor preheated burning stove is in the special equipments such as three usefulness reactors.
1. anti-skidding thin turnover panels of number row's all-metals on the rotary spherical digester wall, the section of plate becomes dentation, leaves the liquid flooding hole at the bottom of the plate, and turnover vapour, liquid become the bi-directional symmetrical setting.
2. each trench bottom of high temperature black liquor causticizing tank, hot black liquor stillpot and warm black liquor stillpot is equipped with ripple-wheel agitator and liquid in-out mouth.The spoil disposal cinder notch.
3. the flash distillation filter is reverse-flow, and it is shell-tube type that free falling-film is sent out device, and both directly contact.The flash distillation filter is a tubular, and the centre is provided with double-layer filtering net, and upper screen is not on the funnel cone of upper strata.The horizontally disposed lower filter screen of filler neck direct puncture to filler neck top, pass that horizontal lower floor slips through the net and following hopper walls is provided with several fistulaes.The top of cylindrical shell is provided with the device middle-end that conduit and free falling-film steam and joins, and there is perforate the stack shell upper and lower.Shell-tube type free falling-film evaporimeter is characterized in that the dividing plate at shell-tube type tube bank two ends, wherein, in the end pore, inserts the tube bank littler than former bore.But the outer wall that inserts pipe does not contact the inwall that is inserted into pipe.Insert the pipe and the other end and pass another dividing plate, and weld, import and export are arranged between dividing plate with dividing plate.The cylindrical shell upper end is provided with outlet, and the cylindrical shell bottom is provided with import and export.
4. combustion furnace is an interlayer garden cartridge type.Furnace roof week is provided with several air intake vents, and several hot-air mouths of row are respectively arranged around the shaft top and the bottom, and furnace bottom is provided with air port and melt outlet.
5. the black liquor preheater is a riser type, and the vertical tube two ends are welded on up and down on the house steward.Import and export are respectively arranged, and last house steward is welded with concentric switching of vertical tube and washes tube head.
6. three usefulness reactors are the garden cylinder shell, are provided with variable-ratio climbing tooth chain agitator, are provided with mud hole at the bottom of there is hole making drill on the cylindrical shell top.
Fig. 1. be process chart of the present invention: comprise among the figure that capital equipment has: 1. rotary spherical digester; 2. high temperature black liquor causticizing tank; 3. warm black liquor groove; 4. rare black liquor groove; 5. dipper; 6. hot water storgae; 7. warm black liquor stillpot; 8. hot black liquor stillpot; 9. silicon mud kitchen sink; 10. centrifugal separator; 11. filtering ponds; 12. stock tank; 13. dilute black liquid pond; 14. stuff box; 15. black liquor filter press; 16. residual black liquor pond; 17. brown stock chest; 18. lime slaker; 19. pond in the middle of the milk of lime; 20. flash distillation filter; 21. free falling-film evaporimeter; 22.NaOH Drop-adding device; 23. moisture trap; 24. surface condenser; 25. vavuum pump; 26. water seal, accumulator; 27. half concentrated black liquid groove; 28. combustion furnace; 29. waste heat boiler; 30. black liquor preheater; 31. venturi; 32. cyclone dust removal evaporimeter; 33. air-introduced machine; 34. chimney; 35. concentrated black liquid groove; 36. concentrated black liquid measuring tank; 37. dissolving tank; 38. green liquor storage; 39. three use reactor; 40. lime mud filter; 41. separating tank; 42. vavuum pump; 43. separator; 44. strong white liquor storage; 45. weak white liquor storage; 46. tail gas absorber; 47. chemicals tank; 48. air blast.
Accompanying drawing 2: rotary spherical digester device structure schematic diagram.Among the figure, 1. material mouth; 2. rotary spherical digester wall; 3. pass in and out vapour, liquid hole; 4. vapour-liquid conduit; 5. cloth vapour, liquid orifice plate; 6. anti-skidding thin turnover panel.
Accompanying drawing 3: high temperature black liquor causticizing tank.Temperature black liquor stillpot.The hot black liquor stillpot.Not have loam cake outer 1. are cell bodies to warm black liquor groove among the figure; 2. liquid in-out mouth; 3. ripple-wheel agitator; 4. slag notch; 5. gas vent.
Accompanying drawing 4: flash distillation filter: 1. housings among the figure; 2. black liquor import; 3. black liquid outlet; 4. upper hopper filter screen; 5. descend funnel; 6. slip through the net down; 7. fistulae; 8. indirect steam outlet; 9. slag pipe; 10.NaOH dropping liquid inlet.
Accompanying drawing 5: free falling-film evaporimeter: 1. steam inlets among the figure; 2. condensate water outlet; 3. noncondensing gas outlet; 4. black liquor import; 5. black liquid outlet; 6. indirect steam outlet; 7. heating surface bank; 8. insert tube bank; 9. evaporator shell; 10. discharge channel; 11. recycled black liquor outlet; 12. parting liquid inlet.
Accompanying drawing 6: air-jacketed black-liquor combustion Shanghai.1. wind cover is outer among the figure; 2. wind overlaps internal layer; 3. refractory masses; 4. air intlet; 5. hot-blast outlet; 6. air blast; 7. controlling valve; 8. secondary wind hand-hole; 9. wind hand-hole; 10. scraper-trough conveyer groove.
Accompanying drawing 7: riser type black liquor preheater.1. times house stewards among the figure; 2. vertical tube; 3. go up house steward; 4. wash tube head; 5. black liquor enters the mouth; 6. black liquid outlet; 7. remove cinder notch.
Accompanying drawing is used reactor at 8: three.1. variable-ratio agitators among the figure; 2. climbing tooth; 3. drag chain; 4. import; 5. slag notch.
Now the process chart by accompanying drawing 1 illustrates operating procedure of the present invention and using method:
In when operation: at first with the tablet got ready with exchanged out the warm black liquor of storing among the warm black liquor slot last time in the rotary spherical digester for and send in the rotary spherical digester 1. Rotate then rotary spherical digester, make at a certain temperature preimpregnation of tablet washing certain hour. To embathe liquid and enter the warm liquid precipitate groove from rotary spherical digester axis hole 3 one ends, and staticly settle processing, the precipitated liquid that obtains is still risen again in the black liquor slot 3. Row get embathe liquid in, get indirect steam from high temperature black liquor causticizing tank 2 tops, import 1 pair of tablet of rotary spherical digester and impose the gas phase boiling. Under rotary spherical digester rotated, with the high temperature black liquor after the causticization, from the outlet 2 of high temperature black liquor causticizing tank 2, all dispatch entered rotary spherical digester 1, and big liquor ratio under the uniform temperature condition is implemented the black liquor liquid phase to tablet and precooked. Keep certain hour, all enter hot black liquor stillpot 8 and staticly settle processing from rotary spherical digester axis hole 3 liquid of will precooking. High temperature black liquor causticizing tank 2 hot black liquor stillpots 8, the black liquor of temperature black liquor stillpot 7, precipitate through certain hour, under each slot wave wheel 3 stirs, emit body refuse from bottom land outlet 4, enter body refuse kitchen sink 9 again with rare black liquor or the dirty hot water dilution of condensation, make lignin in the body refuse, organic matter and the stripping of alkali part are processed and are removed through centrifugal separator 10 again. Through the hot black liquor that heavy silicon is processed, send into again flash distillation filter 20 and free falling-film evaporimeter 21, evaporation and concentration. When hot black liquor enters from flash distillation filter 20 entrances 2, add an amount of NaOH liquid by Drop-adding device 22 from import 10 and regulate and control black liquor PH, to reduce black liquor viscosity, the generation of carbonating precipitation appears in direct heating with the control combustion tail gas to improve evaporation efficiency. Hot black liquor reduces in the device internal pressure, and evaporation produces indirect steam. Black liquor is then by upper hopper net 4, and the lower filter face that bleeds is at the bottom of being incorporated into mutually fistulae 7 and entering device with lower filter black liquor. Black liquor merges the freedom of entry falling film evaporator with the part black liquor that the free falling-film evaporimeter is discharged again along black liquid outlet 3 at the bottom of entering device. And the suitable upper hopper of filter residue is directly into lower funnel 6, remove body refuse from slag pipe 9 to centrifugal separator, the indirect steam that produces rises and exports 8 freedom of entry falling film evaporators 21 along flash distillation filter top indirect steam, when secondary steams almost behind entrance 1 freedom of entry falling film evaporator 21, be subjected to the circuitous condensation of heating surface bank 7 resistances and form water, being down to condensate water outlet 2 enters moisture trap 23 Separation of Waters and integrates with the dirty hot-tub of condensation with surface condenser 24 condensate water, the gas that separates exports with steam chest that 3 noncondensing gas phases are incorporated into surface condensation heat exchange 24 and after black liquor enters from import 4, saequential transmission heat pipe 7 flows down, be subjected to steam heated, step-down effect repeatedly, evaporation in heating surface bank 7. Constantly regenerate indirect steam and rise, enter in the intubate 8, continue to pass and rise to top, separation chamber indirect steam outlet 6. Reenter surface condenser, through vacuum system gas-liquid separating treatment, institute's hot water that obtains and contain the chemicals condensate liquid and can supply again respectively pulping by cooking and washing pulp utilization. Concentration thickens behind the black liquor vaporizing, runs underneath at the bottom of the device along heating surface bank 7 tube walls, flows out 30% above concentration black liquor from black liquid outlet 5 and enters the half concentrated black liquid groove 27. Half dope of evaporation and concentration, send into waste heat boiler afterbody riser type black liquor preheater 30 and enter lower house steward 1 from inlet tube 5 and be subjected to waste-heat oven tail gas indirect heating to compile upper house steward 3 to vertical tube 2, enter respectively venturi 31 from outlet 6 then and directly contact heating evaporation with flue gas with cyclonic dedusting evaporator 32. At this moment black liquor solid content rises to more than 45%, concentrated black liquid enter concentrated black liquid groove 35 and be pressed into the spiral spray gun by measuring tank 36, spray in the air-jacketed Non-water-cooled wall black liquid combusting furnace and burn. Air, that entrance 4 enters around spraying furnace roof from air-jacketed, improve temperature by the shaft heat transfer, draw hot blast by air blast 6 from furnace bottom outlet 5, it is combustion-supporting to transfer valve 7 regulation and control hot blasts to enter stove from first and second air port 8,9 through air blast 6 and control, because air-jacketed Non-water-cooled wall combustion furnace has maintenance furnace temperature characteristics, the silica removal of black liquor is processed, PH regulates and control, makes black liquor viscosity to reduce, and the concentrated black liquid spray condition improves. It is on the low side to overcome non-wood pulping black liquor solid caloric value, also can be reached by the self-contained heat of black liquor organic matter the purpose of combustion decomposition, burner exhaust heat produces steam by boiler, enough chemical recovery pulping and digesting overall processes need, and need not replenish initial steam and oil, the fuel such as natural gas, behind the waste heat for generating steam, tail gas after tail gas continues to be utilized by black liquor preheating 30 and venturi 31 cyclone dust removals evaporation 32, temperature and contain SO still about 70 ℃2Composition enters the rare cold white bath of liquid of tail gas absorber 46 usefulness again and drenches SO in the absorption tail gas2, produce Na2SO
3, be directly used in pulping by cooking. Play simultaneously SO2The preventive and therapeutic effect of harm.
When chemical recovery was divided into two class situation: a, use sulfate process, caustic soda-aq method, alkaline sodium sulfite legal system slurry, the fused mass of combustion decomposition was dissolved into green liquor with rare white liquid. Replace limeslaker with three usefulness reactors 39, green liquor causticizing device, white liquid cleaner. Green liquor causticizing sucks strong white liquor storage tank 41 by siphon pipe after sinking clearly, and for the pulping by cooking reuse, the rare white liquid of sucking-off enters thin liquid groove 45 for dissolving fused mass and tail gas absorber absorption SO2With. The white clay sediment, filter 40 filters after washing, and rare white liquid enters weak white liquor storage 45. Filter the main CaCO of white clay3Composition mixes an amount of coal dust, through storing up air-dry postforming calcination and regeneration lime, as building materials lime, makes clinker brick ... etc. usefulness, b, use solvent method, ammonia salt method, sulphite process are during the slurrying such as neutral Ammonium Sulfite Method. Be in the digestion process of closed circulation of the present invention do not have stingyly, airborne release, volatility chemistry mouthful product decompose to lose and greatly reduce. During the self energy evaporation and concentration, the chemicals in the indirect steam is subjected to abundant condensation, and ammonia, sulphur, alcohol are caught a cold and condensated in the condensation water, can directly be recovered for re-use in pulping by cooking. Black liquor still can be according to aforementioned, evaporation and concentration, and combustion decomposition, recuperation of heat produce steam. Small paper mill evaporates half dope with self energy during with neutral pulping with ammonium sulfite method, and recycling steam boiler cyclone dust collectors are evaporated to 50% concentration black liquor, act as a fuel, directly spray into boiler and burn with coal, replace fuel, also can supply local rural area as the chemical fertilizer utilization 50% concentration black liquor. Or in 50% black liquor, adding 50% calcium, magnesium, ground phosphate rock, drying is processed, and as SOLID ORGANIC Composite fertilizer, all can obtain cost-effective environmental improvement effect. The chemicals that reclaims is prepared through preheating, by boiling medicine composition and quantity requirement, by rotary spherical digester axis hole 3, send into rotary spherical digester, then from rotary spherical digester two ends axis hole, entering steam heats up, because tablet has passed through preliminary treatment, tablet hot water DDGS, 1%NaOH DDGS, the molten lignin of part and the sticky silt of tablet, mould, heteroproteose cell, fat, cured, Deng partly precooked liquid stripping and tablet produce that acidic materials are combined and, temperature still is therefore can reduce chemicals usage more than 100 ℃ in this moment boiling vessel, can shorten the heating-up time, after this, continue to pass into initial steam from 3 two ends, ball journal hole and be incubated boiling. Because multistage processings of precooking in early stage, tablet is wet splash softening, the removal of lyotrope, liquor strength raises relatively, oozes for the soup expansion, causes fine condition. Anti-skidding dredge turned over, and strengthened the feed liquid mixed dissolution, promotes to improve to steam to separate speed, therefore can high speed cooking, also can obtain the paper pulp of better degree of cooking. When the insulation terminal point, will store black liquor in the warm black liquor slot last time, send into from rotary spherical digester axis hole 3, by diffusion washing, exchange high temperature Normal juice black liquor for, come out from rotary spherical digester other end axis hole 3, enter high temperature black liquor causticizing tank. The lime slurry that will sieve in advance before the high temperature black liquor enters causticizing tank contains SiO according to black liquor2What of amount add certain C aO. Make Na in the black liquor2SiO
3With Ca(OH)2Reaction is removed at the bottom of generating non-dissolubility calcium silicates deep gouge. Increased effective alkali part, for the next black liquor usefulness of precooking mutually. Rare black liquor exchanges warm black liquor for: with rare black liquor slot black liquor, sent into by rotary spherical digester axis hole 3 one ends, exchange out warm black liquor in the ball for from the rotary spherical digester axis hole other end, enter warm black liquor slot, use for next preimpregnation washing tablet. After black liquor is extracted in the heat washing in the ball, rotate immediately rotary spherical digester, allow paper pulp contain useless diffusion, the vadose solution of continuing, then open the material mouth, emit slurries in filtering ponds, with a small amount of residual black liquor flushing, the rare black liquor of gained changes rare black liquor slot over to, paper pulp pours stock tank with residual black liquor after filtering, and then the remaining black liquor of warp let-off regulating box 14 filter presses, 15 extruding is more multiplexing again. Add evaporimeter in press filtration, an amount of hot water that exchanges for promotes the fiber waste liquid to remove, obtain at last the wash degree height, and mass dryness fraction 25-30% true qualities are slightly starched, finished full pulping process for the screening bleaching.
Advantage of the present invention is: not single centering, small paper mill have produce effects, and large-scale paper plant is suitable for, and to grass, bast class, bamboo class, seed class, non-wood pulping can both use. Not only be suitable for bases method, sulphite process, neutral sulfity process, solvent method, also use again as the chemical recovery of other chemical pulping method. Use the again repeatedly recycling of heat circulation sealing boiling and chemicals, but decrease consumption. Traditional pulping by cooking, waste liquid, waste vapour, residue contamination can be governed, and fuel factor is given full play to. Boiling chemical recovery overall process reaches self-supporting energy level. Pulping by cooking yield height, steady quality, it is good slightly to starch physical strength. Digester cycle shortens, and the acquisition cost decrease can obtain significant economic benefit and social benefit.
The present invention's energy decrease energy consumption, compared with prior art, a ton slurry consumption quantity of steam reduces by 1/2, reduce 1/4 of chemicals (total alkali content) consumption: thick slag reduces, and relatively increases yield 2%, and pulp quality is stable, heat up and the soak weak point, productivity ratio improves about 1/10; Paper pulp easily washs, when reducing water significantly; Do not have gas discharging foul smell elimination at pulping process, alleviate the environment of plant and pollute; Obtained high temperature, high black liquid, extraction rate reached is more than 90%; Because the self-contained heat energy oneself of high temperature black liquor evaporation, without initial steam, black liquid consistency reaches more than 30%, recovery alkali per ton consumes 10 tons of steam less, gives prominence to and has reduced energy consumption, has got rid of the harm of silica, black liquor viscosity reduces, black liquid consistency improves, and combustion furnace is without postcombustion, and black liquor organic matter self energy is burnt. And can obtain steam supply causticization and the additional boiling steam consumption. In slurrying and chemical recovery process, accomplish heat energy self-supporting; Reduced investment, from black liquid extraction, black liquor vaporizing concentrates and the equipment effectiveness of causticization changes. Obviously reduce the table of equipment ton, just estimate, but the investment-saving is over half. Alkali recovery can reach 80% above level. The cost recovery decrease. Pollution is governed, and the performance of enterprises and social benefit all can obviously improve.
Embodiment:
With sulfate process, bamboo pulp production natural kraft, year pulping by cooking ability is used the example of slurrying new technology of the present invention 3000～4000 tonnes of production scales.
Raw material and weather conditions: raw material is assorted bamboo, and wherein cizu is about 40%, and bambusa textile, fishscale bamboo are about 55%, and other bamboo kind is about 5%, the solid base of caustic soda 92%.40% liquid base, akali sulphide 60% solid, local water quality PH6.8, the annual water temperature is more than 20 ℃.Cut-out, tablet length 50m.m interior 95%.Sulfate process, rotary spherical digester boil bamboo pulp the old and new technical conditions: the contrast of boiling technology condition
| Project name | Measurement unit | Former technology | Novel technique |
| The rotary spherical digester charge amount | kgt/m | 160～165 | 175～180 |
| Total alkali consumption (NaOH+Na 2s) | % | 16～18 | 12～13 |
| Sulphidity | ％ | 20 | 15－20 |
| Solid-liquid ratio | Material: liquid | 1∶2.5 | 1∶2 |
| Unscreened yield | ％ | 48－50 | 50－53 |
| Thick starch degree | KMnO4 | 25－30 | 24－28 |
| The omnidistance time (effective time) | Divide | 376 | 307 |
Digestion process and time contrast
Equipment comprises 1.14m
32 of rotary spherical digesters; 2.20m
31 of high temperature black liquor causticizing tank; 3.20m
3Temperature black liquor groove platform; 4.15m
3Rare black liquor groove platform; 5.15m
3The hot water storgae platform; 6.5m
3Dipper; 7.15m
3Temperature black liquor stillpot platform; 8.15m
3Hot black liquor groove platform; 9.2m
3Body refuse kitchen sink platform; 10. centrifugation board; 11. filtering ponds are 2 under the ball; 12.25m
3Stock tank; 13.25m
31 of dilute black liquid pond; 14. 1 of regulating box; 15.SD 1 in filter press; 16.25m
31 of dilute black liquid pond; 17.30m
31 of brown stock chest; 18.1m
31 of lime slaker; 19.1m
3The milk of lime liquid pool; 20. 1 of φ 1200 * 5000 flash distillation filter; 21.180m
21 of the own falling film evaporator of shell-tube type; 22. 1 of Drop-adding device; 23.ZHF 1 of separator; 24.60m
21 of condenser; 25.ZL 1 in vavuum pump; 26.5m
31 of dirty hot water and water seal tank; 27. half dope groove 50m
32; 28. air-jacketed spray burner and; 29. waste heat boiler is by 1 of ZHP11-A remodeling; 30.30m
3Riser type black liquor preheater; 31. φ 300 * 290 Venturi throats; 32. 1 in φ 1500 * 6000 cyclone dust removal evaporimeters; 33.9-35-11NO10D 1 of air-introduced machine; 34. chimney; 35.20m
31 of concentrated black liquid; 36.2m
3Black ash liquor measuring tank; 37.10m
31 of dissolving tank; 38.20m
31 of green liquor storage; 39. 2 of three usefulness reactors; 40.20m
31 of lime mud filter; 41. 1 of φ 1200 * 2800 vacuum separation groove; 42.SZ-3 1 in vavuum pump; 43. 1 of φ 400 * 600 separator; 44.30m
31 of strong white liquor storage; 45.40m
31 of weak white liquor storage; 46. 1 of φ 800 * 8000 tail gas absorber; 47.5m
3The chemical recovery pond; 48.8-18NO5A 1 of air blast.During operation,
To get tablet ready by hopper and send into rotary spherical digester.Send into 80 ℃ of warm black liquor in the warm black liquor groove at the same time, make a gesture of measuring charged liquid, rotation rotary spherical digester, preimpregnation washing by 1: 3～3.5.With the sticky material in earth, mould, top layer that bamboo chip is brought into, non-fibre wall heteroproteose cell etc., the wet disengaging of splashing, and with the presoak taking-up, with going into 20m
3Leave standstill in the temperature black liquor stillpot and remove the silicon processing.In row's preimpregnation washing lotion, from high temperature black liquor causticizing tank, adopt the indirect steam more than 150 ℃, import rotary spherical digester from the rotary spherical digester axis hole, bamboo chip is implemented gas steam.Promote that air is discharged in scattering and permeating and the bamboo chip, at this moment, 20m
3In the high temperature black liquor causticizing tank, the black liquor of process causticization post precipitation is in the whole conveyor balls of rotary spherical digester axis hole.Keep the 20-30 branch at 140-150 ℃, big liquor ratio is precooked to the bamboo chip liquid phase, and bamboo chip 12-15% lyotrope matter enters and precooks.The back black liquor of then concentration 20% left and right sides PH9-10 being precooked enters 20m
3The hot black liquor stillpot left standstill 1-2 hour, and heavy silicon is handled, and residual air enters dipper preheating soup.At this moment preimpregnation washing lotion, the liquid phase liquid of precooking, high temperature causticization black liquor is all handled through leaving standstill heavy silicon.Its precipitation body refuse slurry compiles into the body refuse kitchen sink again, and dilutes with the hot water of rare black liquor and condenser.Pass through centrifugal separator, remove white residue and reclaim organic matter and alkali part, through the above hot black liquor of silica removal 90% boiling point, send into flash distillation filter 20, add an amount of NaOH by Drop-adding device at this moment and regulate black liquor PH to 12, the black liquor indirect steam that decompression evaporation becomes in device ejects a mouthful steam chest that imports free evaporimeter 21 by device.Evaporation back black liquor filters through driving in the wrong direction in the device, emit after removing foreign material, with part by the mixed freedom of entry falling film evaporator liquid chamber again of black liquor after the free evaporator evaporation.Black liquor becomes liquid film toward current downflow from inserting between tube bank and the heating surface bank, constantly evaporation, constantly heating again, form conduct heat in the rising of pipe steam, the dirty one-tenth of black liquor two is to retrograde flow.Boil-off gas is passed the insertion pipe and is imported surface condensation heat exchange vacuum system to separation chamber, device top by outlet, and recovery is hot to become hot water with chemicals, and condensate water is used for boiling and washing pulp.Heat without indirect steam in evaporation process, the concentrated black liquid solid content also can reach more than 30%, enters half concentrated black liquid storage tank 27 and emits 60-70 ℃ of black liquor by half dope groove.Emit partly by cyclone dust removal evaporimeter 31 that black liquor mixes, send into riser type black liquor preheater 30 and be heated to about 100 ℃ by the tail gas indirect of waste heat boiler 29.Advance to put venturi 31 and cyclone dust removal evaporimeter 32 then.Continue Direct Contact Heating by combustion furnace tail gas humidity and be evaporated to the 45%-50% concentrated black liquid.By measuring tank 36, regulation and control keep between 100-105 ℃ of temperature.Can be sprayed into the stove burning by force feed.Air, is drawn between furnace sandwich by air blast 48 through the heating of body of heater heat transfer interlayer from the top week inlet of air-jacketed garden shape spray combustion stove 28, and by air volume control, 150 ℃ of left and right sides hot blasts are sent in the combustion furnace combustion-supporting from first and second air port.Be 45%～50% concentration black liquor by silica removal, black liquor viscosity reduces, and spray pattern is good.The combustion furnace fire box temperature is stablized 700～800 ℃ can reach the purpose of combustion decomposition without oil, natural gas auxiliary fuel from heat content with the black liquor organic matter.Then the combustion furnace waste heat produces steam and inspissation black liquor by waste heat boiler 29.Come out to contain SO the 60-70 ℃ of tail gas from the cyclone dust removal evaporimeter
2, drench by the rare cold white bath of liquid of absorption tower 46 usefulness again and handle, make SO
2Generate NA
2SO
3, be used for the pulping by cooking process, the 10kgf/cm that waste heat boiler produces
2, steam during 1.8-2t/ is that evaporation need not replenish initial steam, the steam requirement of chemical recovery pulping by cooking overall process is met.Therefore, need not replenish external steam and fuel.Combustion furnace is emitted fused mass and is dissolved into green liquor with rare white liquid, finishes lime slaking by three usefulness reactors 39, green liquor causticizing and the heavy clearance response of white liquid.Strong white liquor sucks strong white liquor storage 44, is back to pulping by cooking.Rare white liquid sucks weak white liquor storage 45 body refuses and passes through washing and filtering machine 40 through separating tank and separator, receives to such an extent that rare white liquid is still gone into weak white liquor storage 45, reclaims SO for fused mass dissolving and absorption tower
2With.Reclaim strong white liquor.Mainly contain NaOH, Na
2S.Through being allocated as boiling composition soup.In dipper, be preheated to 80 ℃ of left and right sides temperature and send into rotary spherical digester by rotary spherical digester (residual air), after owing to precook, temperature is still more than 100 ℃ in the ball, and the heating-up time shortened to 30 fens by 40 minutes, being that pre-digestion tablet DDGS has been removed reaches 12-15%, organic acid combined and.Like this, total alkali charge is reduced to 12-13% by 16-18%.When the insulation boiling, tablet has been wet splash softening, air is got rid of, dissolved tablet and contained that object height reaches more than 12% and the diffusion of the liquid of precooking, improve boil liquid concentration after, have two-way logical vapour to add gentle anti-skidding dredging and turn over facility, auxiliary effect, all speed is separated in steaming and play positive effect, temperature retention time shortened to 135 fens by 170 minutes, the cooking effect of obtaining.When boiling end by 20m
370-80 ℃ of warm black liquor be by the input of rotary spherical digester axis hole one end in the high temperature black liquor groove, exchanges in the ball boiling Normal juice black liquor more than 165 ℃ for.The control discharge opeing is reduced to 100 ℃ and is ended.Entering in advance from rotary spherical digester other end axis hole, addition is SiO
2The 20m of 1-9 times of milk of lime
3In the high temperature black liquor causticizing tank 2, increase 2-4 doubly through high temperature black liquor effective alkali part of causticization precipitation process.For the next liquid phase usefulness of precooking.The high temperature black liquor swaps out and stops still continuing to send into the black liquor that 60 ℃ of rare black liquor grooves in the left and right sides are supplied with to ball, ends during warm black liquor to 60 ℃ in the ball that swaps out, and enters 20m
3Temperature black liquor groove; Use for next pre-wash tablet.At this moment, paper pulp exchanges for through the washing of high temperature closure in the ball.Rotating rotary spherical digester 3-5 then changes, and promptly emits slurries and goes into filtering ponds.Wash a little with the filter press black liquor.Slurry stops in overanxious pond and filters after 10～20 minutes, obtains rare black liquor and goes into the black liquor pond and change rare black liquor groove over to, uses for exchanging warm black liquor next time for.Use the pressing filtering liquid diluted pulp, allow in the fiber raffinate diffusion then send into filter press 15.And at filter press adding evaporimeter acquisition hot water, raising removes residual black liquor effect.Press juice is by driving in the wrong direction, and usefulness becomes the high temperature black liquor recovery to handle at last repeatedly.The paper pulp mass dryness fraction 25-30% of press filtration in the end supplies with screening and purifies, making beating papermaking.
Complete bamboo slurry is produced brown paper, is to contain in the new technology multistage boiling new technology, and the multistage diffusion washing exchanges new technology for.The heat energy of circulation sealing, chemicals recycling, the evaporation of high temperature black liquor self energy, the organic matter self energy is decomposed the technology that reclaims chemicals, can receive following economic benefit and social benefit.
The pulping by cooking benefit: steam reduces 50-60%: chemical use amount reduces 20-30%; Bits reduce, unscreened yield is high by about 2%; Pulp quality is stable, and the paper look bright-coloured, physical strength index height; Total time shortens, the high 10-15% of production efficiency; Paper pulp thermal diffusion washing reduces water consumption 50%; Boiling does not have atmosphere, stingy discharging, alleviates odor pollution; Black liquid extraction concentration height, temperature height, extraction rate of black liquor can reach more than 90%.
The chemicals self energy reclaims: the high temperature black liquor is from heat content, and the self energy evaporation is without initial steam.Evaporated black liquid concentration reaches more than 30%.About 10 tons of former technology ton alkaline consumption vapour have not consumed now; Organic matter self energy combustion decomposition is not replenished oil, natural gas, and about 100 kilograms of the general ton of fuel alkali consume fuel oil now can save; Silica harm problem is resolved, and alkali recovery is raised to more than 80% by 40%.Reduce cost recovery greatly.The slurrying three wastes obtain administering.Small investment, the economic benefit height.Solved living environment.Provide technical foundation with developping production.
Claims (3)
1, the boiling new technology is reclaimed in the non-timber chemical pulping of a kind of low-loss and energy-saving, comprises the charging feed liquor, and even liquid air changes, the row of intensification is stingy, and the gas blowing is amplified in the insulation boiling, black liquid extraction, black liquor vaporizing concentrates, combustion decomposition, technology such as green liquor causticizing are formed, it is characterized in that in the pulping by cooking, adopt preimpregnation, precook, gas phase, the multistage boiling of liquid phase, raw material and the diffusion of paper pulp multistage exchange washing for, heat energy and the recycling of chemicals closed circulation, black liquor silicon removing, high hot black liquor self energy evaporation and concentration organic compound combustion decomposes, the new technology that chemical recovery is utilized, by 1. boiling vessels charging feed liquor, 2. preimpregnation washing, 3. gas phase boiling, 4. liquid phase cooking, 5. black liquor silicon removing, 6. the heat energy of high hot black liquor self energy evaporation and concentration and condensate liquid are recycled, and 7. the heat energy and the chemical recovery of the decomposition of black liquor organic compound combustion are 8. advanced medicine and heated up, 9. insulation boiling, 10. warm black liquor exchanges the high temperature black liquor for, 11. high temperature black liquor causticizations, and 12. rare black liquor exchange warm black liquor for, 13. blowing filters rare black liquor, 14. press filtrations extract remaining black liquor.
2, the boiling new technology is reclaimed in the non-timber chemical pulping of low-loss and energy-saving according to claim 1, it is characterized in that 1. rotary spherical digesters charging feed liquor, from boiling, exchanged warm black liquor in the hopper of coming in and going out last time for for sending into, 2. preimpregnation washing, after being warm black liquor goal, rotate rotary spherical digester, make tablet phase mutual friction in warm black liquor, and at a certain temperature, dipping and washing, with the sticky material of tablet with bring silt into, the wet disengaging of splashing such as dust, enter and embathe in the liquid and remove, 3. gas phase boiling, be when eliminating is embathed liquid and gone into the black stillpot of temperature, provide indirect steam input rotary spherical digester by high temperature black liquor causticizing tank, realize tablet gas phase boiling in short-term, 4. liquid phase cooking, be to store last time in the high temperature black liquor causticizing tank, whole high temperature black liquor input rotary spherical digesters through causticization, under big liquor ratio low pressure condition, keep one regularly, after tablet implemented the black liquor liquid phase and precook, the black liquor of all precooking enters the hot black liquor stillpot, its residual air enters dipper, 5. black liquor silicon removing, be with high temperature black liquor causticizing tank, the hot black liquor stillpot, temperature black liquor stillpot, through staticly settling the body refuse that is sunken to bottom land, all enter and wash in the mud sump, then, add rare black liquor or evaporator condensation liquid dilution washing, organic matter and alkali part in the stripping body refuse, then regain lysate by centrifugal separator, remove things such as silicon mud, during hot black liquor self energy evaporation and concentration the hot and cold lime set to recycle be that black liquor behind the silica removal of precooking is sent into the flash distillation filter, utilize indirect steam to pass through the free falling-film evaporimeter, the indirect black liquor, promptly need not replenish initial steam, with the self-contained heat energy recycling of black liquor, black liquid consistency is concentrated into more than 30%, send burning utilization, when black liquor is gone into the flash distillation filter, add an amount of NaOH to regulate PH, reduce black liquor viscosity, improve evaporation efficiency and prevent the heating of combustion furnace tail gas the carbonating precipitation to occur, the evaporimeter indirect steam is handled gained hot water through heat exchange and is used for washing pulp, the dirty hot water of gained condensation is used to precook, preimpregnation and dilution silica removal body refuse, in use during the property pulping with ammonium sulfite method, in the dirty hot water of condensation, contain the ammonia composition, withdrawal repeats to use as buffer preparation cooking liquor, 7. the black liquor organic compound combustion heat and the chemical recovery of decomposing, be by self energy evaporation and concentration 30% above concentration black liquor, improve temperature through preheater and reenter evaporimeter with combustion furnace tail gas Direct Contact Heating, increase black liquor and continue evaporation efficiency, black liquid consistency is reached more than 45%, can spray into the stove internal combustion, heat because wind-warm syndrome is no water-cooling wall air-jacketed body of heater heat radiation, ignition temperature is stable, the silica removal black liquor viscosity is little, and it is good that black liquor is gone into the stove atomizing, do not need makeup oil, gas fuel reaches the purpose of combustion decomposition, the organic compound combustion heat produces steam by waste heat boiler, can satisfy and reclaim boiling steam needs, tail gas contains SO after continuing to be evaporated the black liquor utilization in the tail gas
2Deng composition, absorb SO with rare cold white liquid shower again
2, generate Na
2SO
3Returning boiling uses, when chemical recovery, be divided into two class situations, a, when using the slurrying of alkaline process class, as soda processes, sulfate process, the alkaline sodium sulfite method, fused mass replaces lime slaking with reactor after being dissolved into green liquor with rare white liquid again behind the incineration of liquor, green liquor causticizing, white liquid is heavy clear, obtains strong white liquor (alkali) and replys pulping by cooking use, washing and filtering white clay, mixed in right amount with coal dust, through store up wind in after, be shaped and forge combustion, as usefulness such as building materials regeneration lime system clinker bricks, b, use neutral Ammonium Sulfite Method, during slurrying such as ammonia salt method, be the boiling closed circulation, in the technology, not big, stingy discharging, the volatile chemical loss is few, the indirect steam of black liquor when the self energy evaporation and concentration fully is subjected to condensation, ammonia, sulphur can obtain reclaiming multiplexing, and neutral black liquor of imonium concentrates after-combustion tail gas water cooling and absorbing and promptly gets (NH
4)
2SO
3And NH
4HSO
3Liquid is used for pulping by cooking, or utilize steam boiler tail gas to be evaporated to 50% concentration more again the black liquor, black liquor sprays into steam boiler and makes fuel, also 50% concentration black liquor can be made for fertilizer or add 50% calcium, magnesium, ground phosphate rock is made organic complex solid fertilizer, also 50% concentration black liquor modulating adhesive can be used, 8. advancing medicine heats up, be with the soup of the white liquid of chemical recovery through the auxiliary tone preheating, send into boiling vessel, heat up on request, because tablet digestion is in advance handled, tablet hot water DDGS 1%NaOH DDGS, part lignin and the sticky silt mould of tablet, heteroproteose cell fat, cured, quilts such as glue take off in the pre-digestion liquid and remove, the interior temperature of rotary spherical digester this moment is still more than 100 ℃, can reduce effective chemicals usage and shorten the heating-up time, 9. insulation boiling, be in the ball tablet wet splash softening, the removal of DDGS, liquor strength is made a gesture of measuring relative rising with medicine, the gas distribution of rotary spherical digester and anti-skidding dredge to turn over strengthened that feed liquid is mixed and expansion is oozed, promoting all even steaming of boiling to separate speeds up, realize high speed cooking, 10. warm black liquor exchanges the high temperature black liquor for, be during terminal point, warm black liquor to be sent into rotary spherical digester in insulation, in the ball that swaps out more than 150 ℃ high temperature Normal juice black liquor enter high temperature black liquor causticizing tank, after causticization for the next liquid phase usefulness of precooking, 11. the black liquor causticization is with the prefabricated milk of lime that sieves, and contains SiO by black liquor
2Necessarily make a gesture of measuring in the adding causticizing tank, make to contain Na in the black liquor
2SiO
3Solution reaction becomes CaSiO
3Non-dissolubility thing is deposited in bottom land to increase black liquor effective alkali part, precook for next black liquor liquid phase, 12. rare black liquor exchanges warm black liquor for, be that black liquor in rare black liquor groove is sent into rotary spherical digester, the interior warm black liquor of the ball that swaps out is gone in the warm black liquor groove, use for next preimpregnation washing, 13. blowings filter rare black liquor, are exchange the washing end in ball after, rotate rotary spherical digester immediately, open the material mouth, emit slurries and go into filtering ponds, with the residual black liquor washing and filtering of part, obtaining rare black liquor changes in rare black liquor groove, for exchanging warm black liquor usefulness for next time, remaining black liquor is extracted in 14. press filtrations, is to go into the pond with contrary the using towards the thick slurry of rare filtration of remaining black liquor, allow paper pulp contain liquid diffusion stripping, deliver to filter press then and add evaporimeter recovery hot water, extract remaining black liquor at last, more than the total extraction rate reached to 90% of black liquor, the paper pulp mass dryness fraction reaches 25-30% and purifies bleaching for screening and finish slurrying whole process after the press filtration.
3, the special equipment of boiling new technology is reclaimed in the non-timber chemical pulping of a kind of low-loss and energy-saving, the equipment that comprises, boiling vessel, the causticization stillpot, flash distillation is filtered, the free falling-film evaporimeter, air-jacketed black liquor preheated burning stove, special equipments such as three usefulness reactors, its feature 1. digestion process are that the rotary spherical digester wall is provided with the anti-skidding thin turnover panel of number row's all-metal, the section of plate becomes dentation, leave the liquid flooding hole at the bottom of the plate, turnover gas, liquid becomes the bi-directional symmetrical setting, 2. high temperature black liquor causticizing tank, the hot black liquor stillpot, temperature black liquor stillpot, ripple-wheel agitator is all arranged at the bottom of each groove, with the liquid in-out mouth, the spoil disposal cinder notch, 3. be that the flash distillation filter is reverse-flow, the free falling-film evaporimeter is a shell-tube type, both directly contact, the flash distillation filter is a tubular, the centre is provided with double-layer filtering net, upper screen is located on the infundibular body of upper strata, the horizontally disposed lower filter screen of filler neck direct puncture is filler neck top extremely down, passes lower screen and following hopper walls and be provided with several funnels, and the top of cylindrical shell is provided with conduit and free falling-film evaporimeter middle-end is joined, perforate is arranged at stack shell middle part and bottom, shell-tube type free falling-film evaporimeter is characterized in that the dividing plate at shell-tube type tube bank two ends, wherein, in the one end pipe sky, insertion is than the little tube bank of former bore, but the outer wall of insertion pipe can not contact the inwall that is inserted into pipe, and the other end that inserts pipe passes another dividing plate, and weld with dividing plate, import and export are arranged between dividing plate, and the cylindrical shell upper end is provided with outlet, and the cylindrical shell bottom is provided with import and export, 4. combustion furnace is the interlayer barrel-type, furnace roof garden week is provided with several air intake vents, and thermal wind exhausting inlet is respectively arranged around the shaft top and the bottom, and furnace bottom goes out to set out to be provided with air outlet, the melt outlet, 5. the black liquor preheater is a riser type, on the house steward, import and export is arranged respectively about the vertical tube two ends are welded on, last house steward is welded with and the concentric tube head of washing of vertical tube, 6. three use reactor, be the garden cylindrical shell, be provided with variable-ratio climbing tooth drag chain agitator, there is perforate on the cylindrical shell top, is provided with slag-drip opening at the bottom of the device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN92102867A CN1067080A (en) | 1992-04-15 | 1992-04-15 | The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp |
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| CN92102867A CN1067080A (en) | 1992-04-15 | 1992-04-15 | The low-loss and energy-saving recovery and steam-boiling technology for chemically making non-wooden pulp |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381635C (en) * | 2004-07-23 | 2008-04-16 | 山东泉林纸业有限责任公司 | Method of preparing bleached chemical pulp using cotton stalk |
| CN101535565B (en) * | 2006-11-07 | 2011-01-12 | 美卓电力有限公司 | A method and equipment for the evaporation of black liquor that is obtained from a digestion process during the production of cellulose pulp |
| CN102072613A (en) * | 2011-01-20 | 2011-05-25 | 徐斌 | Method for multi-effect evaporation and dehydration of solid material |
| CN102134520A (en) * | 2011-01-28 | 2011-07-27 | 徐斌 | Method for improving quality of lignite by adopting fixed bed in single set of equipment |
| CN102449231A (en) * | 2009-05-26 | 2012-05-09 | 日本制纸株式会社 | Method for digesting lignocellulosic material |
| CN102733231A (en) * | 2012-07-18 | 2012-10-17 | 广西金桂浆纸业有限公司 | Pulping heat recycling device |
| CN103266525A (en) * | 2013-06-03 | 2013-08-28 | 佳木斯龙江福浆纸有限公司 | Silica removing method for straw pulp black liquor |
| CN104404804A (en) * | 2014-10-21 | 2015-03-11 | 华南理工大学 | Chemical pulp or dissolving pulp preparation method and experimental displacement steaming and cooking device thereof |
| CN105088848A (en) * | 2015-09-07 | 2015-11-25 | 武汉凯比思电力设备有限公司 | Pulp paper black liquor hyperconcentration device, pulp and paper black liquor treatment system as well as methods |
| CN108356835A (en) * | 2018-03-20 | 2018-08-03 | 张莉笛 | A kind of Intelligent Machining robot |
| CN109312537A (en) * | 2016-05-27 | 2019-02-05 | 维美德公司 | Dual alkali charging for tablet dipping |
| CN110184169A (en) * | 2019-06-20 | 2019-08-30 | 湖北中农华威生物工程有限公司 | A kind of yeast fermentor and its recovery method with recycling feed liquid function |
| CN111287011A (en) * | 2020-03-26 | 2020-06-16 | 陕西科技大学 | Method for comprehensively recycling pulping waste liquid |
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1992
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100381635C (en) * | 2004-07-23 | 2008-04-16 | 山东泉林纸业有限责任公司 | Method of preparing bleached chemical pulp using cotton stalk |
| CN101535565B (en) * | 2006-11-07 | 2011-01-12 | 美卓电力有限公司 | A method and equipment for the evaporation of black liquor that is obtained from a digestion process during the production of cellulose pulp |
| CN102449231A (en) * | 2009-05-26 | 2012-05-09 | 日本制纸株式会社 | Method for digesting lignocellulosic material |
| CN102449231B (en) * | 2009-05-26 | 2014-05-14 | 日本制纸株式会社 | Method for digesting lignocellulosic material |
| CN102072613A (en) * | 2011-01-20 | 2011-05-25 | 徐斌 | Method for multi-effect evaporation and dehydration of solid material |
| CN102072613B (en) * | 2011-01-20 | 2012-06-06 | 徐斌 | Method for multi-effect evaporation and dehydration of solid material |
| CN102134520A (en) * | 2011-01-28 | 2011-07-27 | 徐斌 | Method for improving quality of lignite by adopting fixed bed in single set of equipment |
| CN102134520B (en) * | 2011-01-28 | 2013-05-15 | 徐斌 | Method for improving quality of lignite by adopting fixed bed in single set of equipment |
| CN102733231B (en) * | 2012-07-18 | 2016-02-10 | 广西金桂浆纸业有限公司 | Slurrying heat energy recycle device |
| CN102733231A (en) * | 2012-07-18 | 2012-10-17 | 广西金桂浆纸业有限公司 | Pulping heat recycling device |
| CN103266525A (en) * | 2013-06-03 | 2013-08-28 | 佳木斯龙江福浆纸有限公司 | Silica removing method for straw pulp black liquor |
| CN103266525B (en) * | 2013-06-03 | 2015-07-29 | 佳木斯龙江福浆纸有限公司 | A kind of silicon removing method of straw pulp black liquor |
| CN104404804A (en) * | 2014-10-21 | 2015-03-11 | 华南理工大学 | Chemical pulp or dissolving pulp preparation method and experimental displacement steaming and cooking device thereof |
| CN104404804B (en) * | 2014-10-21 | 2016-10-05 | 华南理工大学 | A kind of chemical pulp or dissolving pulp preparation method and test-type displacement cooking device thereof |
| CN105088848A (en) * | 2015-09-07 | 2015-11-25 | 武汉凯比思电力设备有限公司 | Pulp paper black liquor hyperconcentration device, pulp and paper black liquor treatment system as well as methods |
| CN109312537A (en) * | 2016-05-27 | 2019-02-05 | 维美德公司 | Dual alkali charging for tablet dipping |
| CN108356835A (en) * | 2018-03-20 | 2018-08-03 | 张莉笛 | A kind of Intelligent Machining robot |
| CN110184169A (en) * | 2019-06-20 | 2019-08-30 | 湖北中农华威生物工程有限公司 | A kind of yeast fermentor and its recovery method with recycling feed liquid function |
| CN111287011A (en) * | 2020-03-26 | 2020-06-16 | 陕西科技大学 | Method for comprehensively recycling pulping waste liquid |
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