CN108579113A - A kind of method for concentration and concentration systems of energy-efficient cellulose solution - Google Patents
A kind of method for concentration and concentration systems of energy-efficient cellulose solution Download PDFInfo
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- CN108579113A CN108579113A CN201810378051.6A CN201810378051A CN108579113A CN 108579113 A CN108579113 A CN 108579113A CN 201810378051 A CN201810378051 A CN 201810378051A CN 108579113 A CN108579113 A CN 108579113A
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- B01D—SEPARATION
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- B01D1/26—Multiple-effect evaporating
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Abstract
The present invention relates to a kind of method for concentration and concentration systems of energy-efficient cellulose solution, the method for concentration includes the following steps：(1) initial concentration：Cellulose solution to be concentrated is passed through primary concentration liquid film type scraper plate heat exchanger and carries out preliminary heating concentration, and the steam of generation enters MVR systems, and primary concentration liquid film type scraper plate heat exchanger is introduced after boosting by MVR systems and is used as heat source；(2) secondary concentration：Cellulose solution after initial concentration is passed through secondary concentration liquid film type and scrapes sheet heat exchanger progress reheating concentration, using live steam as heat source.Present invention application MVR systems are combined the concentration that scheme realizes cellulose solution with live steam heating, by the abundant recycling of the indirect steam generated in evaporating concentration process, improve steam utilization efficiency, solve the problems, such as that the industry development energy restricts.
Description
Technical field
The present invention relates to a kind of method for concentration and concentration systems of energy-efficient cellulose solution, belong to solution concentration neck
Domain, the more particularly to method for concentration and concentration systems of NMMO solution dissolving cellulose solution in Lyocell fibers production technology.
Background technology
N-methylmorpholine-N- oxides (NMMO) are a kind of chemical substances, and molecular formula is C5H11NO2, pole is known as to fiber
Strong solubility property is crystalline solid or liquid under room temperature, and nontoxic, alkalescent is dissolved in water, ethyl alcohol etc., and hygroscopicity is strong, per molecule
In combination with multiple crystallizations water.
The fiber of solvent method production is referred to as Lyocell fibers, is that pulp is directly dissolved in NMMO, and through dry-jet wet-spinning
Obtained regenerated celulose fibre.It studies the 1980s successfully, China is commonly called as " tencel ", since its excellent performance is known as
" 21 century green fiber ".Austrian Lenzin company is leader, and China Baoding, Ying Li, the middle green fibre of spinning have also grasped production rhymed formula
Key, by nearly development in 40 years, many basic patents are expired, and production technology is decrypted substantially, and " tencel " will be met in China
Come fast-developing.
Currently, having significant progress at present with NMMO dissolving cellulose production regenerated celulose fibres, wherein using liquid film
Formula scrapes sheet heat exchanger and evaporates to form the scheme of glue and generally applied, however usually liquid film type scrapes the heat medium of sheet heat exchanger all
Using live steam, heating need to control certain temperature, pressure, and single effect evaporation energy consumption is larger, and general gas-water ratio is 1.1, steam profit
Low with rate, energy consumption is big, and cost is higher.
Invention content
Technical problem to be solved by the invention is to provide a kind of method for concentration of energy-efficient cellulose solution and concentrations
System is combined the concentration that scheme realizes cellulose solution using MVR systems with live steam heating, will be in evaporating concentration process
The abundant recycling of indirect steam of generation improves steam utilization efficiency, solves the problems, such as that the industry development energy restricts.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of concentration side of energy-efficient cellulose solution
Method includes the following steps：
(1) initial concentration：Cellulose solution to be concentrated is passed through primary concentration liquid film type scraper plate heat exchanger and tentatively add
The steam of thermal concentration, generation enters MVR systems, and primary concentration liquid film type scraper plate heat exchanger is introduced after boosting by MVR systems and is made
For heat source；
(2) secondary concentration：Cellulose solution after initial concentration is passed through secondary concentration liquid film type and scrapes sheet heat exchanger progress two
Secondary heating concentration, using live steam as heat source.
The beneficial effects of the invention are as follows：Scraping sheet heat exchanger using NMMO swellings pulp, using liquid film type (also has referred to as film
Evaporator, film processor) be concentrated by evaporation generate viscose glue patent it is very much, but have no using MVR systems utilize secondary vapour thermal energy
The technical solution for reducing live steam consumption, can save a large amount of colds, applicant tries by largely groping using MVR systems
Verify it is bright feasible, this technical solution be expected to solve fibre manufacturing technique in by steam total amount restrict solvent method fiber it is production-scale
Problem.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the mass fraction of cellulose is 6%-8% in cellulose solution to be concentrated.
Further, during initial concentration, the evaporation capacity of cellulose solution to be concentrated is 23%-26%, initial concentration
The mass fraction of cellulose is 8%-12% in cellulose solution afterwards.
Further, the mass fraction of cellulose is 12%-15% in the cellulose solution after secondary concentration.
Further, the steam generated in step (1) enters MVR systems by explosion-protection equipment.
On the basis of above-mentioned method for concentration, the invention further relates to a kind of concentration systems of energy-efficient cellulose solution,
Sheet heat exchanger, the primary concentration are scraped including the primary concentration liquid film type scraper plate heat exchanger interconnected and secondary concentration liquid film type
Liquid film type scrapes sheet heat exchanger and is equipped with steam (vapor) outlet, the import of the steam (vapor) outlet connection MVR systems, and the MVR systems go out
The mouth connection primary concentration liquid film type scraper plate heat exchanger.
Further, the primary concentration liquid film type scraper plate heat exchanger includes that primary material cavity and being contacted with primary material cavity changes
The primary heat exchange chamber of heat, the primary material cavity are equipped with primary filament element solution inlet port, primary filament element taphole and institute
Steam (vapor) outlet is stated, the primary heat exchange chamber is equipped with primary heat exchange medium entrance and primary heat exchange media outlet, and the steam goes out
Mouth be arranged between primary filament element solution inlet port and the primary filament element taphole and be connected to the MVR systems into
Mouthful, primary heat exchange medium entrance described in the outlet of the MVR systems, the primary filament element solution inlet port is waited for for being passed through
The cellulose solution of concentration, the primary heat exchange media outlet are used for outer row's condensed water.
Further, it includes that two level material cavity and being contacted with two level material cavity changes that the secondary concentration liquid film type, which scrapes sheet heat exchanger,
The secondary heat exchange chamber of heat, the two level material cavity are equipped with secondary fiber element solution inlet port and secondary fiber element taphole, institute
It states secondary heat exchange chamber and is equipped with secondary heat exchange medium entrance and secondary heat exchange media outlet, the primary filament element taphole connects
Lead to the secondary fiber element solution inlet port, the secondary heat exchange medium entrance is connected to mating live steam system, the two level
Cellulose solution outlet is used for outer row's condensed water for the cellulose solution after concentration is discharged, the secondary heat exchange media outlet.
Further, the steam (vapor) outlet is connected to the import of the MVR systems by explosion-protection equipment.
Specific implementation mode
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit
Determine the scope of the present invention.
The present invention relates to a kind of method for concentration of energy-efficient cellulose solution, include the following steps：
(1) initial concentration：Cellulose solution to be concentrated is passed through primary concentration liquid film type scraper plate heat exchanger and tentatively add
The steam of thermal concentration, generation enters MVR systems, and primary concentration liquid film type scraper plate heat exchanger is introduced after boosting by MVR systems and is made
For heat source；
(2) secondary concentration：Cellulose solution after initial concentration is passed through secondary concentration liquid film type and scrapes sheet heat exchanger progress two
Secondary heating concentration, using live steam as heat source.
It comprises the concrete steps that：The dregs of rice put into certain density NMMO solution according to a certain percentage, are swollen and pass through mechanical agitation shape
At atherosclerotic suspension liquid；Suspension liquid is by certain device with certain speed even into primary concentration liquid film type scraper plate heat exchange
Device, carries out preliminary heating concentration, and the indirect steam being evaporated in the process enters MVR systems, weighed again after being boosted by MVR systems
The new primary concentration liquid film type scraper plate heat exchanger that introduces is as heat source, the steam for having recycled cellulose solution to be evaporated,
So only initial concentration of the primary concentration liquid film type scraper plate heat exchanger to material can be maintained with less steam.By preliminary
After concentration, cellulose solution total amount greatly reduces, and introduces secondary concentration liquid film type and scrapes sheet heat exchanger, further enrichment, due to object
Expect the temperature rise of (cellulose solution), it is no longer economical using MVR systems, so selecting using live steam as heat source, profit
It can be realized with mating vapour system.
The mass fraction of cellulose is 6%-8% in cellulose solution wherein to be concentrated.During initial concentration, wait for dense
The evaporation capacity of the cellulose solution of contracting is 23%-26%, and the mass fraction of cellulose is in the cellulose solution after initial concentration
8%-12%.The mass fraction of cellulose is 12%-15% in cellulose solution after secondary concentration.
It can be seen that after preliminary and secondary concentration from the content of cellulose in above steps solution, cellulose contains
Amount reaches 12%-15%, and cellulose is mixed to form glue with nmmo solvents within this range；From evaporation capacity as can be seen that due to
There is the elevation of boiling point in mixed solution, and improved in proportion and increasing degree is larger as the raising boiling point of concentration appreciates.Cause
This initial concentration process application MVR system need to consider the problems of that boiling point temperature rises, and the evaporation capacity of 23%-26% is to utilize MVR works
One economical operation range of skill.
In addition, the steam generated in step (1) enters MVR systems by explosion-protection equipment.
About explosion-protection equipment comprising burst disk adds the water wash system, principle to be：Steam superheating temperature is reduced by water wash
Degree, it is ensured that the safe temperature of process operation；Effect is：The material decomposition product contained in steam is set to operate in one by explosion-protection equipment
A stabilization, safe temperature range reduces the risk factor of explosion；Such as special explosive event, is released by burst disk and be
System pressure, protects equipment.
The invention further relates to a kind of concentration systems of energy-efficient cellulose solution, including the primary concentrate interconnected
Membrane type scrapes sheet heat exchanger and secondary concentration liquid film type scrapes sheet heat exchanger, and the primary concentration liquid film type scraper plate heat exchanger, which is equipped with, to be steamed
Vapor outlet, the steam (vapor) outlet are connected to the import of MVR systems, and primary concentrates liquid film type described in the outlet of the MVR systems
Scrape sheet heat exchanger.
On the basis of above-mentioned concentration systems, it can also be improved as follows：The primary concentration liquid film type scraper plate heat exchange
Device includes primary material cavity and the primary heat exchange chamber with primary material cavity contact heat-exchanging, and the primary material cavity is equipped with primary fine
The plain solution inlet port of dimension, primary filament element taphole and the steam (vapor) outlet, the primary heat exchange chamber are situated between equipped with primary heat exchange
Matter import and primary heat exchange media outlet, the steam (vapor) outlet setting is in primary filament element solution inlet port and primary filament element
Between taphole and be connected to the imports of the MVR systems, primary heat exchange medium described in the outlet of the MVR systems into
Mouthful, for being passed through cellulose solution to be concentrated, the primary heat exchange media outlet is used for the primary filament element solution inlet port
Outer row's condensed water.
On the basis of above-mentioned concentration systems, it can also be improved as follows：The secondary concentration liquid film type scraper plate heat exchange
Device includes two level material cavity and the secondary heat exchange chamber with two level material cavity contact heat-exchanging, and it is fine that the two level material cavity is equipped with two level
The plain solution inlet port of dimension and secondary fiber element taphole, the secondary heat exchange chamber is equipped with secondary heat exchange medium entrance and two level is changed
Thermal medium outlet, the primary filament element taphole are connected to the secondary fiber element solution inlet port, the secondary heat exchange medium
The mating live steam system of inlet communication, the secondary fiber element taphole are used to that the cellulose solution after concentration to be discharged,
The secondary heat exchange media outlet is used for outer row's condensed water.
On the basis of above-mentioned concentration systems, it can also be improved as follows：The steam (vapor) outlet is connected by explosion-protection equipment
Lead to the import of the MVR systems.
In the present invention, it is to exchange heat to realize that cellulose solution is steamed by the contact of material cavity and heat exchanging chamber to scrape sheet heat exchanger
Hair.And in order to adapt to MVR systems, it is set on the primary material cavity in primary concentration liquid film type scraper plate heat exchanger for Flow of Goods and Materials
A steam (vapor) outlet is counted, for the indirect steam generated during primary evaporator to be discharged, this steam is imported by explosion-protection equipment
In MVR systems, by being back to again in primary concentration liquid film type scraper plate heat exchanger after the boosting processing of MVR systems, pass through primary
Heat transferring medium import is passed through primary heat exchange chamber.On this basis, mating live steam system can also be increased, changed by primary
Thermal medium inlet increases a small amount of live steam into primary heat exchange chamber, to maintain primary concentration liquid film type scraper plate heat exchanger to fibre
The evaporation and concentration of the plain solution of dimension.
In general, the primary filament element solution inlet port on primary material cavity and primary filament element taphole are respectively first
Grade concentration liquid film type scraper plate heat exchanger both sides, such structure, can by steam (vapor) outlet be arranged primary filament element solution into
Between mouth and primary filament element taphole, and above, the indirect steam generated in evaporating concentration process is moved up from steaming
Vapor outlet is expelled in MVR systems, carries out recycling.
And secondary concentration liquid film type scrapes sheet heat exchanger also including two level material cavity and secondary heat exchange chamber, but since it is considered that
The temperature that secondary concentration liquid film type scrapes the cellulose solution in sheet heat exchanger is relatively high, then is not drawn instead with MVR systems
It calculates, so the heat source of secondary heat exchange chamber is entirely live steam, utilizes mating live steam system.
Obvious results fruit for the specific embodiment of method for concentration of the present invention and concentration systems exemplified below:
By the squeezing pulp of double centner water content 50%, the mass fraction concentrated is recycled with 537 kilograms in premixer
It is mixed for 60% NMMO solution, adds antioxidant, obtain the slurry congee that content of cellulose is 7.8%, in a mixer
Storage 30-50 minutes.
The slurry congee (78 DEG C) is steamed with 637 kgs/hr of the primary concentration liquid film type scraper plate heat exchanger of speed feeding
Hair concentration, in this step, it is 10.4% that cellulose concentration, which is concentrated into content, and production per hour is 480.77 kilograms.
The slurry congee is scraped into sheet heat exchanger with 480.77 kilograms per hour of speed feeding secondary concentration liquid film type again, using new
Fresh steam heating, it is final to concentrate as the viscose glue of 416.7 kilograms, content of cellulose 12%.
Conventional pressure relief evaporation technology is taken, single-effect evaporation device, which often evaporates 1 ton of water, need to consume 1.1 tons of steam, evaporate absolute pressure
Control often evaporates 1 ton of water chilling requirement 734kw between 40-80mbar.Therefore single-action reduction vaporization process operation expense is：It steams
Vapour expense 1.1 × 110=121 members, handpiece Water Chilling Units power consumption expense 734/1500 × 380 × 0.47=87.39 members, add up to tradition
It is 121+87.39=208.39 members that technique, which often evaporates 1 ton of water rate,.New process using the present invention, whole process are divided into two sections,
637-416.7=220.3 kgs/hr of total evaporation；First stage evaporation rate：(637-480.77)/220.3 × 100%
=70.9%, second stage steams water and accounts for 29.1%.Indirect steam is utilized with MVR system circulations, and MVR systems often evaporate 1 ton of steaming water
Power consumption is 35kw, whole process MVR system power consumptions：709/1000 × 35 × 0.47=11.66 members, steam consumption 0.291 ×
1.2 × 110=38.41 members, handpiece Water Chilling Units power consumption：233/1500 × 380 × 0.47=27.74 members.Total new process often evaporates 1
Ton water rate is 11.66+38.412+27.74=77.81 members.Newly-increased material is needed between the concentration of new process primary and secondary concentration
Delivery pump, there are certain operating costs.But new process is greatly reduced compared with traditional handicraft cold consumption, therefore and cooling-water machine
The cooling water system operating cost that matches of group operation also accordingly declines, and is not considered in above calculate, thus can with it is newly-increased
Delivery pump operating cost offsets.New process is can be seen that compared with traditional handicraft by calculating data above, often evaporates 1 ton of water
New process reduces 208.39-77.81=130.58 members compared with traditional handicraft operating cost.
By 7500 tons of silk production lines are produced per year, finished product water content 9% calculates, and it is (7500 × 1000/ that need to evaporate total Water
54.5) × 220.3/1000=30316.5 tons of water/year, new process saved every year compared with traditional handicraft expense be 30316.5 ×
130.58/10000=395.87 ten thousand yuan, being much larger than the equipment investment of MVR systems.It can be seen that new work using the present invention
Cost can be greatly reduced in skill, solve the problems, such as to be restricted solvent method fiber production scale by steam total amount in fibre manufacturing technique.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of method for concentration of energy-efficient cellulose solution, which is characterized in that include the following steps：
(1) initial concentration：Cellulose solution to be concentrated be passed through primary concentration liquid film type scraper plate heat exchanger tentatively heated it is dense
It contracts, the steam of generation enters MVR systems, and the primary concentration liquid film type scraper plate heat exchanger of introducing, which is used as, after being boosted by MVR systems adds
Heat source；
(2) secondary concentration：Cellulose solution after initial concentration be passed through secondary concentration liquid film type scrape sheet heat exchanger carry out it is secondary plus
Thermal concentration, using live steam as heat source.
2. a kind of method for concentration of energy-efficient cellulose solution according to claim 1, which is characterized in that fibre to be concentrated
The mass fraction of cellulose is 6%-8% in the plain solution of dimension.
3. a kind of method for concentration of energy-efficient cellulose solution according to claim 2, which is characterized in that initial concentration mistake
Cheng Zhong, the evaporation capacity of cellulose solution to be concentrated are 68%-72%, the matter of cellulose in the cellulose solution after initial concentration
Amount score is 8%-12%.
4. a kind of method for concentration of energy-efficient cellulose solution according to claim 3, which is characterized in that after secondary concentration
Cellulose solution in cellulose mass fraction be 12%-15%%.
5. according to a kind of any one of Claims 1-4 method for concentration of energy-efficient cellulose solution, which is characterized in that
The steam generated in step (1) enters MVR systems by explosion-protection equipment.
6. a kind of concentration for realizing the energy-efficient cellulose solution of method for concentration as described in any one of claim 1 to 5
System, which is characterized in that changed including the primary concentration liquid film type scraper plate heat exchanger interconnected and secondary concentration liquid film type scraper plate
Hot device, the primary concentration liquid film type scraper plate heat exchanger are equipped with steam (vapor) outlet, the steam (vapor) outlet connection MVR systems into
Mouthful, primary concentration liquid film type scraper plate heat exchanger described in the outlet of the MVR systems.
7. a kind of concentration systems of energy-efficient cellulose solution according to claim 6, which is characterized in that the primary is dense
It includes primary material cavity and the primary heat exchange chamber with primary material cavity contact heat-exchanging, the primary object that contracting liquid film type, which scrapes sheet heat exchanger,
Expect that chamber is equipped with primary filament element solution inlet port, primary filament element taphole and the steam (vapor) outlet, the primary heat exchange chamber
It is equipped with primary heat exchange medium entrance and primary heat exchange media outlet, the steam (vapor) outlet is arranged in primary filament element solution inlet port
Between the primary filament element taphole and the imports of the MVR systems is connected to, described in the outlet of the MVR systems
Primary heat exchange medium entrance, the primary filament element solution inlet port for being passed through cellulose solution to be concentrated, change by the primary
Thermal medium outlet is used for outer row's condensed water.
8. a kind of concentration systems of energy-efficient cellulose solution according to claim 7, which is characterized in that the two level is dense
It includes two level material cavity and the secondary heat exchange chamber with two level material cavity contact heat-exchanging, the two level object that contracting liquid film type, which scrapes sheet heat exchanger,
Expect that chamber is equipped with secondary fiber element solution inlet port and secondary fiber element taphole, the secondary heat exchange chamber is equipped with secondary heat exchange
Medium entrance and secondary heat exchange media outlet, the primary filament element taphole are connected to the secondary fiber element solution inlet port,
The secondary heat exchange medium entrance is connected to mating live steam system, and the secondary fiber element taphole is concentrated for being discharged
Cellulose solution afterwards, the secondary heat exchange media outlet are used for outer row's condensed water.
9. according to a kind of any one of claim 6 to 8 concentration systems of energy-efficient cellulose solution, which is characterized in that
The steam (vapor) outlet is connected to the import of the MVR systems by explosion-protection equipment.
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| WO2008086550A1 (en) * | 2007-01-17 | 2008-07-24 | Lenzing Aktiengesellschaft | Forming solutions |
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| CN1201802A (en) * | 1997-06-06 | 1998-12-16 | 郑孟松 | Production of low viscocity cellulose solution |
| CN101088993A (en) * | 2006-06-13 | 2007-12-19 | 上海里奥纤维企业发展有限公司 | NMMO evaporating process |
| WO2008086550A1 (en) * | 2007-01-17 | 2008-07-24 | Lenzing Aktiengesellschaft | Forming solutions |
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Application publication date: 20180928 |