CN101748635B - Method for preparing slurry by replacement cooking - Google Patents
Method for preparing slurry by replacement cooking Download PDFInfo
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- CN101748635B CN101748635B CN2010101263928A CN201010126392A CN101748635B CN 101748635 B CN101748635 B CN 101748635B CN 2010101263928 A CN2010101263928 A CN 2010101263928A CN 201010126392 A CN201010126392 A CN 201010126392A CN 101748635 B CN101748635 B CN 101748635B
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Abstract
The invention discloses a method for preparing slurry by replacement cooking, which comprises the following steps: filling the boiler with warm black liquor and warm white liquor; heating up once; releasing steam slightly; heating up to supplement alkali liquor and carrying out replacement; carrying out temperature preservation; carrying out heat replacement before carrying out emptying; and carrying out emptying. The method of the invention sends the black liquor replaced in a high temperature section cooking boiler to a low temperature section cooking boiler so as to save a heat black liquor storage tank of the high temperature section, and at the same time the process has less heat loss, the production process is easy to be controlled and the production cost is obviously reduced. The high temperature black liquor replaced before the step of emptying is used for heating the alkali liquor in a heat white liquor tank and a warm white liquor tank and is used for heating and replacing after the steps of filling the boiler and releasing the steam slightly so as to realize recovery and recycling of the heat energy.
Description
Technical field
The present invention relates to a kind of pulping by cooking method, particularly relate to a kind of method for preparing slurry by replacement cooking.
Background technology
The digesting technoloy that generally adopts in China paper pulp papermaking enterprise is the boiling of rotary spherical digester gap at present, the small investment of rotary spherical digester gap boiling, and instant effect, cooking quality are easy to control, also exist floor space big simultaneously, yield poorly the more high shortcoming of energy consumption.Along with the scale of papermaking enterprise constantly enlarges, rotary spherical digester gap digesting technoloy can not adapt to that papermaking enterprise maximizes, the requirement of scale.The distinct issues of conventional batch cooking technology are: it is that band is pressed and spurted that disposed slurry is finished in boiling, spurts a large amount of indirect steams of process flash distillation (waste gas), and surrounding air is caused bigger pollution; Simultaneously, these indirect steams need spray cooling with a large amount of clear water, thereby the dirty hot water that produces has strengthened the discharge of wastewater load again; The heat of slurry dispose procedure fails effectively to be recycled, unit steam consumption height.In today of paying attention to environmental protection, energy scarcity, it is imperative to improve backward technology.
Displacement heating (RDH) digesting technoloy is a kind of digesting technoloy in the development eighties in last century fast, its objective is the paper pulp of production soft under the condition of the low steam consumption.The RDH digesting technoloy is the improvement to traditional boiling mode, before pot is put in vertical batch cooking, contain the soup that has surplus heat with residual alkali from the digester extraction, be re-used in next pot boiling again, " hydrothermal solution " of being replaced held in pressure tank or normal pressure storage tank standby respectively by the height of temperature.This way has not only been saved the energy, has reduced the consumption of boiling medicine, also can obtain chemical reaction selectively, minimizing is to cellulosic destruction, further deviate from lignin, produce low kappa number, good comprehensive properties paper pulp, also extremely helpful to follow-up bleaching.
Batch (-type) displacement cooking (DDS) technology then is the improvement to the RDH digesting technoloy, and the basic principle of DDS decoction system is identical with the RDH decoction system.Difference is: decoction system has adopted cold black liquid to add white liquid and has filled at when filling with substance, has effectively expanded the effect that temperature is filled, and the effect of pre-preg is also more obvious, has reduced Kappa number, has improved yield.The DDS digesting technoloy has adopted advanced automation control system, better solved bias current, groove district liquid level prediction, put pot process and stop up problems such as prediction.
More than two kinds of technologies have a common shortcoming to be: black liquor need be replaced in the pressure volume pot at last in the digesting technoloy process, and it is corrosion-resistant that this jar High Temperature High Pressure requires, so cost is higher.The DDS digesting technoloy has replacement process such as cold white liquid filling, temperature are filled, heat is filled, and its process complexity is loaded down with trivial details; The amount of investment of the DDS decoction system that 8-10 is ten thousand tons is more than 5,000 ten thousand, and construction costs is very high.
Summary of the invention
The objective of the invention is provides a kind of method for preparing slurry by replacement cooking at above-mentioned deficiency of the prior art.This method is directly delivered to the black liquor that displaces in the high temperature section digester in the low-temperature zone digester, has saved the hot black liquor storage tank of high-temperature part, and the heat loss of this process is littler simultaneously, and production process is easy to control, and production cost obviously reduces.
The inventor has carried out exploring repeatedly in the invention process, adopts following method technical solution problem:
1. traditional digestion process is hot black liquor to be released put into other groove jar and store, use in boiling next time or when heating up then, so heat loss is higher, and the suitable costliness of cost of the required corrosion-resistant storage tank of big capacity high.Among the present invention, the boiling replacement process is the displacement of cooking liquor between pot and the pot, and the speed of temperature increase is faster; Digester cycle shortens, and a digester cycle shortened to 3-4 hour from original 4-5 hour, and the digester output of same volume is higher; Under identical output, construction costs can reduce about half.
2. traditional digestion process be with whole one pot raw material and cooking liquor from the normal temperature state with Steam Heating to keeping warm mode, steam consumption is very big when therefore heating up, and rapid the reducing of insulation back steam consumption, this process vapour amount is very unbalanced, influences the stable of whole steam supply pipe network.Among the present invention, the temperature rising major part of digester is the fluid exchange that relies between the digester, so the speed that digester heats up is very fast, and thermal loss is little; Steam consumption is just relatively more balanced, and is less to the influence of whole steam supply network; Ton slurry steam consumption during boiling descends, and traditional boiling mode is 1.8-2.4 ton vapour/ton slurry, and the present invention can be reduced to 0.5-0.9 ton vapour/ton slurry.
3. cooking liquor is disposable adding in traditional digestion process, and to final stage of cooking, the decline that the concentration of pot inner cooking liquid will be progressively influences the effect of boiling.Among the present invention, cooking liquor adds stage by stage, what add during the dress pot is warm black liquor and a small amount of white liquid, the residual alkali of the part of black liquor has obtained utilization, added the white liquid of fresh heat during the high temperature section displacement, kept higher concentration of lye, whole digestion process is more even, and the mode consumption that the soup unit consumption is more traditional will lack; Fibre damage is little, so paper pulp yield and output are higher.
For achieving the above object, the technical solution adopted for the present invention to solve the technical problems is:
A kind of method for preparing slurry by replacement cooking comprises the following steps:
(1) dress pot:, add warm black liquor and Wen Bai liquid simultaneously with the raw material digester of packing into;
(2) once heat up: close the pot cover valve, open digester circulating pump and heater steam inlet valve simultaneously, be warming up to 0.4-0.5Mpa;
(3) little steam bleeding: close the digester circulating pump, the discharge section incondensable gas is sent into another digester that is in a temperature rise period, discharges from the top valve of this digester again, arrives warm black liquor groove behind heat exchanger;
(4) intensification replenishes alkali lye and displacement: implantation temperature is the 170-175 ℃ of white liquid of heat in digester, displaces cooking liquor; Discharged from the top valve of this digester another digester bottom of thermophase again during the cooking liquor that displaces was sent into and is in, and arrives warm black liquor groove behind heat exchanger;
(5) insulation: heat up with steam, reach 165-170 ℃ end stripping temperature after, inactive steam is incubated;
(6) heat displacement before the blowing: when treating that the H factor reaches 800-1200, inject cleaning solution in digester black liquor is cemented out, the black liquor that displaces is discharged from the top valve, enters warm black liquor groove after the heat exchanger cooling;
(7) blowing: slurry is sent into spraying pot.
As optimal way, with diluting water pump and putting pot pump slurry is extracted out in digester in the described step (7), carry out cold spurting.
As optimal way, open pot top inlet valve in the described step (7) and keep the interior air pressure of pot, start the dilution water pump simultaneously and regulate the dilution water yield, sprayed up to slurry.
As optimal way, cleaning solution is the cleaning solution behind the slip house pulp washing in the described step (6).
As optimal way, the addition of the white liquid of temperature is the 30-60% that always needs alkali charge in the described step (1).
As optimal way, the black liquor that displaces in the described step (6) is used for heating white liquid by heat exchanger.
The collaborative work of the general employing of the inventive method 2 above digesters (is optimum with 4 digesters) is directly delivered to the black liquor that displaces in the high temperature section digester in the low-temperature zone digester.
Beneficial effect of the present invention is: the inventive method is directly delivered to the black liquor that displaces in the high temperature section digester in the low-temperature zone digester, saved the hot black liquor storage tank of high-temperature part, the heat loss of this process is littler simultaneously, and production process is easy to control, and production cost obviously reduces.The black liquor of discharging before the blowing is by energy recovery, and temperature is very low during blowing, and the flash steam of discharge is few, is beneficial to environmental protection.
Description of drawings
The present invention will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is a digester structural representation of the present invention;
Fig. 2 is a process chart of the present invention.
Mark among the figure: 1 circulating pump, 2 heaters, 3 main steam pipes, 4 belt conveyors, 5 digesters, 6 washing liquid baths, the white liquid bath of 7 heat, the white liquid bath of 8 temperature, 9 warm black liquor grooves, 10 heat exchangers, the white liquid pump of 11 heat, 12 vomit pipes.
The specific embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Embodiment 1: as shown in Figure 1, a kind of method for preparing slurry by replacement cooking comprises the following steps:
One, dress pot:, add warm black liquor and Wen Bai liquid simultaneously with the raw material digester of packing into;
Two, once heat up: close the pot cover valve, open digester circulating pump and heater steam inlet valve simultaneously, be warming up to 0.4-0.5Mpa;
Three, little steam bleeding: close the digester circulating pump, the discharge section incondensable gas is sent into another digester that is in a temperature rise period, discharges from the top valve of this digester again, arrives warm black liquor groove behind heat exchanger;
Four, intensification replenishes alkali lye and displacement: implantation temperature is the 170-175 ℃ of white liquid of heat in digester, displaces cooking liquor; Discharged from the top valve of this digester another digester bottom of thermophase again during the cooking liquor that displaces was sent into and is in, and arrives warm black liquor groove behind heat exchanger;
Five, insulation: heat up with steam, reach 165-170 ℃ end stripping temperature after, inactive steam is incubated;
Six, heat displacement before the blowing: when treating that the H factor reaches 800-1200, inject cleaning solution in digester black liquor is cemented out, the black liquor that displaces is discharged from the top valve, enters warm black liquor groove after the heat exchanger cooling;
Seven, blowing: slurry is sent into spraying pot, slurry is extracted out in digester, carry out cold spurting with diluting water pump and putting pot pump.
As preferably, cleaning solution is the cleaning solution behind the slip house pulp washing in the described step 6; The addition of the white liquid of temperature is the 30-60% that always needs alkali charge in the described step 1; The black liquor that displaces in the described step (6) is used for heating white liquid by heat exchanger.
The operation principle of present embodiment is:
1, adopt 4 digesters altogether, each digester is connected into a closed circulation according to low in and high out, each pot import and export are established control valve and are convenient to control, add check-valves between two pots communicating pipe and prevent that boiling alkali lye from flowing backwards; Each pot top side face is established an outlet, uses when this outlet is discharged black liquor for boiling latter stage; The black liquor discharge pipe of each pot is connected in parallel and is connected on then on two heat exchangers, and the medium of the heating of a heat exchanger is white liquid, and the heat medium of another heat exchanger is the warm water that liquor evaporating plant produces.It act as after the black liquor of High Temperature High Pressure in the digester is discharged, by heat exchanger heating white liquid, to make full use of its heat energy.
2, when the white liquid bath of heat full, and black liquor temperature still is higher than 95 when spending, then switch to cold white liquid bath, with the alkali lye circulation cooling of cold white liquid bath, suitable in both temperature, and temperature also is higher than 95 when spending, the valve open of another heat exchanger, the black liquor heating evaporation comes warm water, and the water after the heating is used for pulp washing to the slip house sink, temperature is lower than boiling point after the black liquor that displaces comes out, and stops displacement.
Add white liquid of heat or cleaning solution when 3, the bottom of each pot is established a feed tube and is used to replace black liquor.White liquid can whenever replenishing in digestion process add.Each pot has and overlaps the independently cooking liquor circulatory system, uses in normal boiling.
Do according to the conventional method when 4, adorning pot for the first time, what promptly pack into is cold white liquid, add by the actual consumption that calculates, but pot is adorned at each pot interval, after each pot enters normal operation, can begin to carry out operation of the present invention.
Embodiment 2: a kind of method for preparing slurry by replacement cooking comprises the following steps:
One, dress pot:, add warm black liquor and Wen Bai liquid simultaneously with the raw material digester of packing into;
Two, once heat up: close the pot cover valve, open digester circulating pump and heater steam inlet valve simultaneously, be warming up to 0.4-0.5Mpa;
Three, little steam bleeding: close the digester circulating pump, the discharge section incondensable gas is sent into another digester that is in a temperature rise period, discharges from the top valve of this digester again, arrives warm black liquor groove behind heat exchanger;
Four, intensification replenishes alkali lye and displacement: implantation temperature is the 170-175 ℃ of white liquid of heat in digester, displaces cooking liquor; Discharged from the top valve of this digester another digester bottom of thermophase again during the cooking liquor that displaces was sent into and is in, and arrives warm black liquor groove behind heat exchanger;
Five, insulation: heat up with steam, reach 165-170 ℃ end stripping temperature after, inactive steam is incubated;
Six, heat displacement before the blowing: when treating that the H factor reaches 800-1200, inject cleaning solution in digester black liquor is cemented out, the black liquor that displaces is discharged from the top valve, enters warm black liquor groove after the heat exchanger cooling;
Seven, blowing: slurry is sent into spraying pot, open pot top inlet valve and keep the interior air pressure of pot, start the dilution water pump simultaneously and regulate the dilution water yield, sprayed up to slurry.
Cleaning solution is the cleaning solution behind the slip house pulp washing in the described step 6.
The addition of the white liquid of temperature is the 30-60% that always needs alkali charge in the described step 1.
The operation principle of present embodiment is substantially the same manner as Example 1, and difference is: present embodiment adopts 2 digesters altogether.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (6)
1. a method for preparing slurry by replacement cooking is characterized in that: comprise the following steps:
One, dress pot:, add warm black liquor and Wen Bai liquid simultaneously with the raw material digester of packing into;
Two, once heat up: close the pot cover valve, open digester circulating pump and heater steam inlet valve simultaneously, be warming up to 0.4-0.5Mpa;
Three, little steam bleeding: close the digester circulating pump, the discharge section incondensable gas is sent into another digester that is in a temperature rise period, discharges from the top valve of this digester again, arrives warm black liquor groove behind heat exchanger;
Four, intensification replenishes alkali lye and displacement: implantation temperature is the 170-175 ℃ of white liquid of heat in digester, displaces cooking liquor; Discharged from the top valve of this digester another digester bottom of thermophase again during the cooking liquor that displaces was sent into and is in, and arrives warm black liquor groove behind heat exchanger;
Five, insulation: heat up with steam, reach 165-170 ℃ end stripping temperature after, inactive steam is incubated;
Six, heat displacement before the blowing: when treating that the H factor reaches 800-1200, inject cleaning solution in digester black liquor is cemented out, the black liquor that displaces is discharged from the top valve, enters warm black liquor groove after the heat exchanger cooling;
Seven, blowing: slurry is sent into spraying pot.
2. a kind of method for preparing slurry by replacement cooking according to claim 1 is characterized in that: with diluting water pump and putting pot pump slurry is extracted out in digester in the described step 7, carried out cold spurting.
3. a kind of method for preparing slurry by replacement cooking according to claim 1 is characterized in that: open pot top inlet valve in the described step 7 and keep the interior air pressure of pot, start the dilution water pump simultaneously and regulate the dilution water yield, sprayed up to slurry.
4. a kind of method for preparing slurry by replacement cooking according to claim 1 is characterized in that: cleaning solution is the cleaning solution behind the slip house pulp washing in the described step 6.
5. a kind of method for preparing slurry by replacement cooking according to claim 1 is characterized in that: the addition of the white liquid of temperature is for always needing the 30-60% of alkali charge in the described step 1.
6. a kind of method for preparing slurry by replacement cooking according to claim 1 is characterized in that: the black liquor that displaces in the described step 6 is used for heating white liquid by heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101263928A CN101748635B (en) | 2010-03-18 | 2010-03-18 | Method for preparing slurry by replacement cooking |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101263928A CN101748635B (en) | 2010-03-18 | 2010-03-18 | Method for preparing slurry by replacement cooking |
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| CN101748635A CN101748635A (en) | 2010-06-23 |
| CN101748635B true CN101748635B (en) | 2011-11-09 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012005677A1 (en) * | 2010-07-07 | 2012-01-12 | Stora Enso Oyj | Process for production of precipitated lignin from black liquor and precipitated lignin produced by the process |
| CN102154874B (en) * | 2011-04-29 | 2012-11-21 | 白福安 | Replacement cooking pulping method |
| CN102251425B (en) * | 2011-07-28 | 2014-03-26 | 曲传武 | Paper pulp continuous-replacement boiling process |
| CN102926260A (en) * | 2012-11-26 | 2013-02-13 | 天津市恒脉机电科技有限公司 | Liquid replacing system of replacing and cooking pot |
| 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 |
| CN108130780B (en) * | 2017-12-19 | 2023-11-21 | 四川环龙生活用品有限公司 | Quick pot releasing device |
| CN111021121A (en) * | 2019-11-06 | 2020-04-17 | 福建省青山纸业股份有限公司 | Production method for directly converting natural-color chemical KP pulp on dissolving pulp DP production line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE7802408L (en) * | 1978-03-02 | 1979-09-03 | Gloeersen Stig | WAY TO TRANSFER WITH LIQUID TRANSPORTABLE MATERIALS AS FIBER MATERIALS |
| US4849052A (en) * | 1983-08-24 | 1989-07-18 | Beloit Corporation | Batch digester multi-stage pulping process |
| US5059284A (en) * | 1989-10-30 | 1991-10-22 | Beloit Corporation | Apparatus to displace a digester from both ends |
| US5080757A (en) * | 1989-10-30 | 1992-01-14 | Beloit Corporation | Method to displace a digester from both ends |
| CN1271038A (en) * | 1999-04-16 | 2000-10-25 | 天津轻工业机械厂 | Rice and wheat straw replacing and digesting technoloy and equipment |
| CN1277021C (en) * | 2004-11-16 | 2006-09-27 | 山东泉林纸业有限责任公司 | Rice and wheatgrass replacing and cooking process |
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