CN103061177B - The method and apparatus of the wet feed preparation before bagasse continuously cooking - Google Patents
The method and apparatus of the wet feed preparation before bagasse continuously cooking Download PDFInfo
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- CN103061177B CN103061177B CN201110315531.6A CN201110315531A CN103061177B CN 103061177 B CN103061177 B CN 103061177B CN 201110315531 A CN201110315531 A CN 201110315531A CN 103061177 B CN103061177 B CN 103061177B
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Abstract
The invention discloses a kind of wet feed preparation method and apparatus for bagasse continuously cooking.Concrete steps are: stock yard come bagasse through charging belt deliver to shape of a hoof bagasse rinsing machine carry out first time washing, bagasse rolls in rinsing machine, stirring, deliver to the washing of drum-type rinsing machine second time, the third time washing of waterpower washery slag machine is entered after washing out part sugarcane marrow and leachable, bagasse after washing, purifying enters continuously cooking system after dehydration, and the waste water deviate from enters circular water treating system circulating and recovering after treatment.Bagasse raw material washes clean of the present invention is thorough, is conducive to cooking liquor and soaks into, and improve pulping uniformity, washes to system, does not need supplementary clear water through treatment for reuse, decreases rinse dosage and the environmental pollution of full factory.
Description
Technical field
The present invention relates to pulp and paper technology field, the wet feed preparation method and apparatus of to be a kind of with bagasse be raw pulp, specifically comprises the method and apparatus of bagasse washing system and circular water treating system.
Background technology
Along with the fast and stable of China's economy develops, the demand of paper and paperboard also increases year by year.China's timber resources is deficient, and wood pulp supply wretched insufficiency, the utilization of non-wood fiber raw material is still an indispensable important channel of China's supply pulp within the quite a long period.Bagasse belongs to one of best non-wood fibrous raw material, utilizes bagasse pulp can the paper of production high-quality, is also beneficial to reasonable balance papermaking material structure simultaneously.Utilize bagasse pulping and paper-making to be that sugar refinery is carried out fully utilizing, developed a circular economy, one of the important channel of extend industrial chain.Utilize bagasse to carry out pulping and paper-making, China has very ripe experience, and in the Guangxi Zhuang Autonomous Region in national sucrose base, all there are oneself paper company in most of sugar industry groups, and papermaking has become the new growth engines of sugar industry.
Overseas utilization bagasse slurrying preferably country, as Thailand, India etc., be mostly adopt transverse tube even steam system, and domestic Bagassepulping is adopt global batch cooking substantially.Along with pulp and paper making scale improves constantly, rotary spherical digester boiling technology is more and more inadaptable requirement under the new situation.For this reason, clearly propose to eliminate pulping technique and the equipments such as rotary spherical digester in country puts into effect " papermaking Industry Development Policy ".And continuous steamer particularly transverse tube type continuous steamer owing to there being the slurry uniform quality that floor space is little, digestion time is short, produce, steam and power consumption equilibrium, without peak load, system is produced continuously, it is high to produce automatic control level, easily realize the advantage of manufacture automatic control etc., progressively become a kind of new bagasse pulping process.
Continuously cooking system requirements bagasse supplied materials is wanted continuously, evenly, quantitatively, this just gets the raw materials ready to bagasse and brings new problem.Existing domestic bagasse is stored up and is all adopted wet method to fall apart heap mode, and the loose heap of wet method adopts clear water spray buttress heap, makes bagasse water content 70 ~ 80%, keeps moisture-inhibiting, thus control bagasse excessive fermentation, prevent from going bad, keep whiteness; The acidic materials that residual sugar fermentation in bagasse produces also can cement out by the spray continued, and decrease the consumption of pulping chemical, but stockyard are due to the corrosion of acid, also bring the unfavorable factor that stockyard sandstone is mixed into raw material.
How will the bagasse system of getting the raw materials ready of batch cooking equipment be generally adopted to transform at present, meet the requirement of continuously cooking, on the basis of the leachable in removing Bagasse Material, sandstone, heavy seeds, reach and to accomplish continuously, evenly, quantitatively, this reckons without in system before being.
Summary of the invention
The object of the invention is the method and apparatus that wet feed preparation in a kind of bagasse continuous steaming-boiling technology is provided for the pulp mill taking bagasse as raw material, to reach required qualified bagasse raw material.
Another object of the present invention is also the method and apparatus providing bagasse washings process in bagasse wet feed preparation process, avoids papermaking sewage to discharge the harm caused environment.
In bagasse continuous steaming-boiling technology of the present invention, wet feed preparation method (hereinafter referred to as " stock method ") is achieved in that
The bagasse removal of impurities (deironing) that stock yard comes is delivered to shape of a hoof bagasse rinsing machine by conveyer belt and is carried out first time washing, washing time is 8-20 minute, bagasse rolls in rinsing machine, stir, the washing of drum-type rinsing machine second time is delivered to after washing out part leachable, washing time is 1-2 minute, bagasse is in drum-type rinsing machine, impurity is scraped to be separated into separator, then the third time washing of waterpower washery slag machine is entered, washing time is 8-20 minute, bagasse after washing, purifying with bagasse transport pump to Water Extraction Machinery, bagasse discharging mass dryness fraction is (% by weight) 12%-18%, deliver to continuously cooking system, the waste water of discharging from Water Extraction Machinery enters screening machine, remove thick sugarcane marrow and partial impurities, enter sedimentation basin again, the inclusion particles that gravity is large precipitates, water adds appropriate fining agent through depositing reservoir, then wet feed preparation operation cleaning bagasse is sent back to.
Inject waterpower washery slag machine with the warm water of 40-70 DEG C after the third time washing of above-described bagasse to clean.
Equipment needed for above-described stock method comprises tramp iron separator, shape of a hoof bagasse rinsing machine, drum-type rinsing machine, trash eliminator, waterpower washery slag machine, bagasse pump and spiral dewater etc., and the centre of described shape of a hoof bagasse rinsing machine is the shape of a hoof
structure, increases the time of staying of bagasse at rinsing machine; Described drum-type rinsing machine and trash eliminator are made of one, Water Extraction Machinery adopts inclined screw structure, the material loading conveyer belt port of export receives shape of a hoof bagasse rinsing machine, the outlet of shape of a hoof bagasse rinsing machine connects drum-type rinsing machine and waterpower washery slag machine successively, be connected with bagasse pump and inclined helix dehydrator, rinsing machine, drum-type rinsing machine and waterpower washery slag motor spindle are all configured with sundries collector and by periodic exhaustion again.
In above-described bagasse wet feed preparation process, the method for bagasse washing and circulating water treatment is that the waste water of discharging from Water Extraction Machinery enters screening machine, remove thick sugarcane marrow and partial impurities, enter sedimentation basin again, the inclusion particles that gravity is large precipitates, water adds appropriate fining agent through depositing reservoir, then sends wet feed preparation operation cleaning bagasse back to.
The screening machine adopted is oblique screening machine, makes sugarcane marrow be not easy to block hole; The sedimentation basin adopted is inclined-plate clarifying basin, the sedimentation basin of settling velocity also than common of inclined-plate clarifying basin is effective, the fining agent added can adopt polyaluminium sulfate or bodied ferric sulfate, also flocculant can be added, such as polyacrylamide or polymethacrylates, addition is that every cube of sewage adds 5-10 gram of fining agent or flocculant.
Equipment characteristic of the present invention:
1, shape of a hoof bagasse rinsing machine: bagasse stirs in rinsing machine, rolling in move forward, rubbing effect is produced between bagasse, larger fibre bundle can be made to open, wash out part sugarcane marrow and leachable, the heavy foreign material (as stone, iron block) of major part, sandstone etc. can be isolated.
2, drum washing machine is also trash eliminator: Bagasse Material is ceaselessly dialled in water by rotary drum and routed up, makes bagasse and washings more fully disperse mixing, is conducive to the sedimentation separation of sandstone.
3, waterpower washery slag machine: waterpower washery slag motor spindle has impeller-type rotor and blade, under power drive, the impeller rotated produces strong eddy current and carries out high degree of agitation to bagasse, under mutual friction between bagasse, bagasse is by fully loose, and stripping residual sugar, leachable, be separated the heavy foreign material of the stone, metal, silt particle etc. be mixed in bagasse, heavy foreign material are fallen into waterpower washery slag motor spindle and are entered sundries collector after precipitation under centrifugal action simultaneously.
4, inclined helix dehydrator: be provided with charging weight subsider and feeder, the heavy seeds such as the sandstone in further collection supplied materials are also separated, if screen cylinder is to remove moisture content and fine impurities (sugarcane marrow etc.), along with the lifting of spiral, moisture content is constantly removed, and reaches the mass dryness fraction of setting.
5, inclined-plate clarifying basin, products characteristics: (1) Precipitation Potential is stronger than conventional precipitation pond: a) desilting area increases.B) swash plate can play to sediment the effect of re-uniting, and floccule is increased, and is easy to precipitation.C) sloping plate deposition creates laminar flow condition, and sedimentation effect is good.(2) sinking sludge concentration increases.(3) the clear water amount of discharging keeps stable the whole year, and there is not mud covering.
The present invention adopts bagasse wet feed preparation, in continuous steaming-boiling technology, can make raw material washes clean before entering boiling, be conducive to cooking liquor and soak into, and improves pulping uniformity.Part sugarcane marrow in bagasse can be washed out, reduce pulping and digesting alkali charge, improve slurry washing performance, reduce bleaching medicine consumption; Can remove the high sugarcane marrow of silicone content, decrease the silicon obstacle of alkali collection, alleviate fouling of evaporator phenomenon, evaporation efficiency is high simultaneously, and energy consumption reduces.Removing sandstone, reduces raw material to the wearing and tearing of equipment, life-extending.
Relative to other grass as raw material silt, dirt content is large, adopt precipitation method sand setting sludge discharging method different, wet method loose heap bagasse ferments through sugar, volatilization etc., and clear water spray keeps moisture, so there is no too many silt and dust in raw material, but because bagasse shower water displaces the acidic materials of residual sugar fermentation generation, heap Ground easily corrodes, water, mud and sand are easily mixed in raw material, so the usual sand content of Bagasse Material is larger, must consider to remove the heavy seeds such as the sandstone in raw material while system bagasse washing of getting the raw materials ready, bagasse washing desanding system adopts combination process and the equipment such as shape of a hoof bagasse rinsing machine+trash eliminator+waterpower washery slag machine+inclined helix dehydrator, the heavy seeds such as sandstone wherein effectively can be removed while clean bagasse.
Beneficial effect of the present invention and system advantage are:
1, at whole washing process, bagasse all ceaselessly can stir, roll, and mutually rubs between bagasse, by fully loose, open, stripping residual sugar, leachable.After washing is completed, bagasse raw material thorough washes clean, is conducive to cooking liquor and soaks into, and improves pulping uniformity.
2, the part sugarcane marrow in bagasse can wash out by bagasse washing, drains with waste water, plays important effect to reduction pulping and digesting alkali charge, raising slurry washing performance, minimizing bleaching medicine consumption; Owing to eliminating the high sugarcane marrow of silicone content, alkali collection production process decreases silicon obstacle, and can greatly alleviate fouling of evaporator phenomenon, evaporation efficiency is high, and energy consumption reduces.
3, the every platform equipment in whole washing process: shape of a hoof bagasse rinsing machine, trash eliminator, waterpower washery slag machine, inclined helix dehydrator are equipped with heavy slag and collect separator; collect the heavy seeds such as stone, metal, silt particle; essentially eliminate the sandstone bringing raw material due to stockyard corrosion into, effectively improve quality and the protection following apparatus of slurry.
Bagasse rolls in rinsing machine, stirring, produces rubbing effect, larger fibre bundle can be made to open, wash out part sugarcane marrow and leachable between bagasse; Heavy foreign material (as stone, iron block), sandstone sedimentation separation.Then bagasse is blown into trash eliminator and by periodic exhaustion.
Two), circular water treating system:
Circular water treating system mainly consider to bagasse dewatering system out waste water process rear reuse.Can washes fully be related to the key of wet feed preparation system success or failure by circulating and recovering, is the important component part of wet feed preparation system.Because bagasse washing needs to carry out (3% ~ 5%) under lower concentration, as washes can not fully reuse, certainly will supplement a large amount of external clear water, cause system water amount greatly, discharge capacity is high, and then affects water consumption and the discharge capacity of full factory.But because containing some sandstones, sugarcane marrow etc. in waste water, and containing certain acidity, corrosivity is comparatively strong, and the treatment for reuse of waste water must consider that various factors just can accomplish that scheme is reasonable.
The present invention has carried out mature consideration in circulating water treatment, well-designed.System is considered to adopt special oblique net filter screen first to carry out filtering, then carrying out natural sedimentation through the sedimentation basin of a special construction, finally show that comparatively clean waste water recycling is to system, external amount of makeup water is made to be no more than 3m3/t over dry raw material, and can supplement other workshop sections (as alkali collection workshop evaporation section) alkaline waste water, do not need clear water, to reduce the rinse dosage of full factory.
Accompanying drawing explanation
Fig. 1 is bagasse wet process for pretreating raw material general flow chart.
Fig. 2 is bagasse washing system conduit line map.
Fig. 3 is circular water treating system conduit line map.
Fig. 4 is shape of a hoof bagasse rinsing machine structural representation.
Detailed description of the invention
Embodiment 1:
The present invention is applied to the wet feed preparation system of certain bagasse pulp and paper making continuously cooking.Equipment described in Figure of description 1-3 of the present invention is installed: the equipment such as shape of a hoof bagasse rinsing machine, drum-type rinsing machine (as trash eliminator), waterpower washery slag machine, inclined helix dehydrator.
Stock yard come bagasse through charging belt deliver to shape of a hoof bagasse rinsing machine carry out first time washing, washing time is 10 minutes, bagasse rolls in rinsing machine, stir, deliver to the washing of drum-type rinsing machine second time, washing time is 1-2 minute, trash eliminator is entered after washing out part sugarcane marrow and leachable, at trash eliminator, weight is separated further and then enters the third time washing of waterpower washery slag machine, washing time is 8-20 minute, the warm water (adopting the alkaline waste water of alkali collection evaporation section) of 40-70 DEG C is injected in waterpower washery slag machine, bagasse after washing, purifying with bagasse transport pump to inclined helix dehydrator, be mixed in comparatively small impurities in bagasse and moisture is removed through Water Extraction Machinery screen cylinder, bagasse discharging mass dryness fraction is 12%-18% (% by weight), the requirement of decoction system scroll feeder can be met.The bottom such as shape of a hoof bagasse rinsing machine, trash eliminator, waterpower washery slag machine, spiral dewater is all configured with sundries collector and by periodic exhaustion.
As shown in Figure 4, be horseshoe-shaped structure 2 in the middle of shape of a hoof bagasse rinsing machine, side is cydariform or oval-shaped shell 1, and after water and bagasse enter horseshoe-shaped structure 2, bagasse rolls in rinsing machine, stirring, washes out part sugarcane marrow and leachable.
System configuration of getting the raw materials ready of the present invention circular water treating system of the present invention, has installed slanted screen and has built swash plate structure sedimentation basin.The waste water that inclined screw is deviate from is introduced oblique net filtration and obtain primary water reuse after sedimentation basin precipitation and enters systemic circulation to shape of a hoof bagasse rinsing machine.
After adopting wet feed preparation system of the present invention to go into operation, ruuning situation is good, for enterprise wins good economic benefit; Each economic target is as follows:
1, after system is gone into operation, because the residual acid of the residual sugar in bagasse raw material is by washes clean, remove portion sugarcane marrow, makes boiling alkali charge significantly reduce simultaneously, alkali charge is starched by 300kg/t and is reduced to 270kg/t slurry, reduces cost 60 yuan (caustic soda price is by 2000 yuan/ton).
2, because the bagasse of cleaning makes the slurries filtration performance (scourability) after boiling improve, improve slurry wash degree, make bleachery chemicals consume chlorine consumption and be down to 60kg/t slurry by 70kg/t slurry, decrease cost of drugs 25 yuan (liquid chlorine price is by 2500 yuan/ton).
3, owing to eliminating the high sugarcane marrow of silicone content, alkali collection production process decreases silicon obstacle, and can greatly alleviate fouling of evaporator phenomenon, evaporation efficiency is high, and energy consumption reduces.Simultaneously because the scourability of slurry improves, improve extraction rate of black liquor, thus improve alkali recovery, also reduce washes discharge load, estimate the benefit about 30 yuan/ton slurry indirectly produced.
In sum, after adopting the present invention, ton starches the 60+25+30=115 unit that can bring benefits.
This factory produces 50000 tons of bleaching bagasse pulps per year, and year can bring benefits: 5x1,15=,575 ten thousand yuan.
This system invests about 1,200 ten thousand yuan altogether, and rough calculation can be recouped capital outlay more than 2 years.
Claims (1)
1. wet feed preparation method in bagasse continuous steaming-boiling technology, is characterized in that, concrete technology step is:
Deliver to shape of a hoof bagasse rinsing machine through conveyer belt after the bagasse removal of impurities that stock yard comes and carry out first time washing, washing time is 8-20 minutes, bagasse rolls in rinsing machine, stir, the washing of drum-type rinsing machine second time is delivered to after washing out part leachable, washing time is l-2 minute, bagasse is in drum-type rinsing machine, impurity is scraped to be separated into separator, then the third time washing of waterpower washery slag machine is entered, washing time is 8-20 minutes, bagasse after washing, purifying with bagasse transport pump to Water Extraction Machinery, bagasse discharging mass dryness fraction is 12%-18%, deliver to continuously cooking system, the waste water of discharging from Water Extraction Machinery enters screening machine, remove thick sugarcane marrow and partial impurities, enter sedimentation basin again, the inclusion particles that gravity is large precipitates, water adds appropriate fining agent through depositing reservoir, then wet feed preparation operation cleaning bagasse is sent back to,
Be horseshoe-shaped structure in the middle of described shape of a hoof bagasse rinsing machine, side is cydariform or oval-shaped shell;
The described bagasse third time washing warm water injection waterpower washery slag machine of 40-70 DEG C cleans; Described waterpower washery slag motor spindle has impeller-type rotor and blade;
The screening machine adopted is oblique screening machine; The sedimentation basin adopted is inclined-plate clarifying basin;
The fining agent added adopts polyaluminium sulfate or bodied ferric sulfate, or adds flocculant polyacrylamide or polymethacrylates, and addition is that every cube of sewage adds 5-l0 gram of fining agent or flocculant.
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- 2011-10-18 CN CN201110315531.6A patent/CN103061177B/en active Active
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| US6436233B1 (en) * | 2000-05-18 | 2002-08-20 | Andritz Inc. | Feeding cellulose material to a treatment vessel |
| CN1715554A (en) * | 2004-07-01 | 2006-01-04 | 天津轻工业机械厂设计研究所 | Water washing continuous boiling method and its device for grass fiber raw material |
| CN101929087A (en) * | 2009-08-04 | 2010-12-29 | 江苏华机环保设备有限责任公司 | Efficient impurity removal process for bagasse |
| CN201485749U (en) * | 2009-08-19 | 2010-05-26 | 北京京诚新星造纸工程技术有限公司 | Wet process feed preparation equipment for grass fiber raw materials and roller type grass washing machine thereof |
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