CN1333403A - Dogstail pulp large liquor ratio circular heating replacing digestion technology and digestion equipment thereof - Google Patents
Dogstail pulp large liquor ratio circular heating replacing digestion technology and digestion equipment thereof Download PDFInfo
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- CN1333403A CN1333403A CN 01127365 CN01127365A CN1333403A CN 1333403 A CN1333403 A CN 1333403A CN 01127365 CN01127365 CN 01127365 CN 01127365 A CN01127365 A CN 01127365A CN 1333403 A CN1333403 A CN 1333403A
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- digesting apparatus
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 39
- 230000029087 digestion Effects 0.000 title claims description 15
- 238000005516 engineering process Methods 0.000 title claims description 14
- 238000010411 cooking Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 72
- 238000009835 boiling Methods 0.000 claims description 66
- 238000006073 displacement reaction Methods 0.000 claims description 41
- 239000003513 alkali Substances 0.000 claims description 29
- 238000002386 leaching Methods 0.000 claims description 12
- 244000025254 Cannabis sativa Species 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 9
- 230000001351 cycling effect Effects 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000010902 straw Substances 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000005200 wet scrubbing Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 241001668545 Pascopyrum Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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Abstract
The present invention discloses a straw pulp large liquor ratio circulating heating repacement cooking process and its cooking equipment, and its process includes the following steps: after the raw material is fed into the cooking equipment, replacing washing water with first-level cooking liquor which can be used for circularly heating the cooking equipment and whose liquor ratio is 1:7.1-8.5, then replacing first-level cooking liquor with second cooking liquor which can be used for circularly heating the cooking equipment and whose liquor ratio is 1:7.1-8.5, then replacing the second-level cooking liquor with replacement liquor. Said cooking equipment includes a digester, the interior of its upper conical section is equipped with an upper grid, its middle-lower section is equipped with intermediate liquor-extracting grid and the end of lower conical suction of the digester is equipped with a four-way valve. Said invented cooking equipment can produce high-quality straw paper.
Description
Technical field
The invention belongs to the paper pulp fabrication process technical field, especially a kind of Dogstail pulp large liquor ratio circular heating replacing digestion technology and digesting apparatus thereof.
Background technology
At present, make paper pulp with grass as raw material in the society and still adopt traditional alkaline process or the conventional digesting technoloy of sulfate process, its main method is after adding grass raw materials such as paddy and wheat grass and alkalescence or kraft liquor in the batch cooking rotary spherical digester together, feed steam, intensification, venting, heat up again, be incubated and carry out delignification reaction, thereby make straw pulp.Though this method can realize the task of slurrying, but because can not be lower in digestion process to cooking liquor circulation heating and liquor ratio, cooking reaction is violent in digestion process, the straw pulp intensity that boiling becomes is low, drainability is poor, especially the black digestion liquid silicone content of the straw pulp made from alkaline process is big, viscosity is high, cause the black liquid extraction difficulty, alkali recovery is low and cost recovery is high, seriously influences the application and the enforcement of grass straw pulp alkali recovery technology.The black liquor that this traditional grass pulp cooking technology is produced is one of present paper-making industrial waste water primary pollution source.
Summary of the invention
Task of the present invention is to provide a kind of Dogstail pulp large liquor ratio circular heating replacing digestion technology and the digesting apparatus for realizing that these process conditions design for overcoming the defective that exists in the above-mentioned prior art, utilize this technology and digesting apparatus can be implemented under the reaction condition of mitigation, deviate from lignin by different level, can be made into the grass paper pulp that paste colors is shallow, drainability good, yield is high, intensity is good.
Task of the present invention takes following technical scheme to realize:
Dogstail pulp large liquor ratio circular heating replacing digestion technology, comprise one-level displacement cooking and secondary displacement cooking, be after the grass raw material is handled through dry and wet stock preparation, enter in the digesting apparatus by dehydration, by its alkali charge after heating in advance is that the first stage boiling liquid of the 60%-70% of whole digestion process total alkali content cements out washings, simultaneously to the heating that in digesting apparatus, circulates of first stage boiling liquid, and with its insulation, being 30% of whole digestion process total alkali content by its alkali charge after heating in advance again---40% secondary cooking liquor cements out first stage boiling liquid, simultaneously to the heating that in digesting apparatus, circulates of secondary cooking liquor, and with its insulation, with displacement liquid the secondary cooking liquor is cemented out, it is characterized in that: the liquor ratio of (1) described first stage boiling liquid is 1: 7.1-8.5; The temperature that first stage boiling liquid is heated in advance is 140-145 ℃; Temperature to first stage boiling liquid circular heating in digesting apparatus is 125-135 ℃; (2) liquor ratio of described secondary cooking liquor is 1: 7.1-8.5; The temperature of heating in advance of secondary cooking liquor is 155-160 ℃; Temperature to secondary cooking liquor circular heating in digesting apparatus is 145-150 ℃.
For realizing that the digesting apparatus that above-mentioned process conditions design is by being provided with charging aperture in the top, its lower end be provided with lower port the pot body, on double-edged fine-toothed comb, middle drawing liquid double-edged fine-toothed comb, four-way pipe and tube still heater and circulation heat pump form, it is characterized in that in the upper cone inner chamber of pot body, being provided with double-edged fine-toothed comb, in the inner chamber of the middle and lower part of pot body, be provided with middle drawing liquid double-edged fine-toothed comb, be provided with four-way pipe in the end of pot body lower cone with its intracavity inter-connection.
Described upward double-edged fine-toothed comb is a conical filter screen, and this taper shape filter screen is positioned on the screen holder, and is positioned on the upper cone inwall of pot body by the gusset that is arranged on the screen holder.This taper shape filter screen is isolated into the two sections of displacement filter screen and circulation filter screen by screen holder with it.On pot body, be respectively arranged with displacement mouth and upper cycling mouth corresponding to displacement filter screen and circulation filter screen.
The drawing liquid double-edged fine-toothed comb is a circle tube leaching net in the middle of described, and this circle tube leaching net is positioned on the screen holder and by being arranged on the middle and lower part that gusset on the screen holder is positioned at pot body cavity, circulation port in the middle of being provided with corresponding to the pot body of circle tube leaching net.
Be covered with respectively on described displacement filter screen, circulation filter screen that the perforate aperture is arranged is the taper hole of the different directions of 2.5-3mm, and making liquid stream send the section and the ratio of the perforate gross area is 21.6-36.9, and the big opening end that the big opening end of the taper hole on this displacement filter screen is positioned at the taper hole on the outside of filter screen, the circulation filter screen is positioned at the inboard of filter screen.Be covered with on the described circle tube leaching net that the perforate aperture is arranged is the taper hole of the different directions of 3mm, and to make liquid stream send the section and the ratio of the perforate gross area be 95.5-190.4, the big opening end of the taper hole of this circle tube leaching net is positioned at the inboard of filter screen.
The port of export of described tube still heater is connected with upper cycling mouth and four-way pipe on the described pot body respectively by pipeline, the entrance point of tube still heater is connected by pipeline and circulation heating delivery side of pump, and the entrance point of circulation heat pump is connected with middle circulation port on pot body.
Owing to adopted above-mentioned digesting apparatus, when raw material when entering in the digesting apparatus boiling behind the dry and wet stock preparation, first stage boiling liquid enters in the digesting apparatus by four-way pipe, the careless water of washing in the digesting apparatus is discharged by the displacement filter screen and through the displacement mouth, thereby realize the task of displacement, first stage boiling liquid is in the digesting apparatus inner cyclic process, under the effect of heat pump, enter tube still heater heating by middle and lower part circulation filter screen, the cooking liquor after the heating by pot body top upper cycling mouth and the four-way pipe of pot body bottom enter carry out in the digesting apparatus on, following two layers circulation heating and delignification reaction.The secondary cooking liquor enters in the digesting apparatus by four-way union first stage boiling liquid is cemented out, and its circulation heating process and first stage boiling liquid phase cement out the secondary cooking liquor with changing liquid together afterwards again, carry out cold spurting by four-way pipe at last.Thereby realizing that first stage boiling liquid displaces washes careless water and first stage boiling liquid circulation heating, secondary cooking liquor is displaced first stage boiling liquid and circulation adds the task that hot and cold spurts to the secondary cooking liquor.
In said process, owing to realized that filter screen is difficult for stopping up the characteristics that the pulp strength after the boiling is good, paste colors is shallow, drainability is good, yield is high, intensity is good in digestion process so have to the technical scheme of cooking liquor circulation heating and employing taper hole filter screen.Owing in its pot body, only be provided with middle double-edged fine-toothed comb, measure big characteristics in addition so have the dress pot.
Owing to adopted above-mentioned technology and digesting apparatus, advantage of the present invention is: shallow except paste colors, drainability good, yield is high, outside the good advantage of intensity, can obtain the black liquor that 80 ℃ temperature, residual alkali reach 2-5g/l, this black liquor is through after repeatedly repeating displacement, the accumulation of the concentration of black liquor (solid content) reaches a more stable numerical value (concentration is 10-12%), and black liquor is light, does not have precipitation.Black liquor viscosity: when concentration was 34.68 ＇ Be (20 ℃), viscosity was 265 centipoises when black liquor temperature was 30 ℃, and viscosity was 65.0 centipoises when black liquor temperature was 60 ℃, and viscosity was 47.0 centipoises when black liquor temperature was 90 ℃.COD amount in the black liquor has obvious reduction, and black liquor when discharging residual alkali can be controlled within the 3-5g/l, therefore black liquor of the present invention is to repeat to be back to pulping by cooking fully, saturation value then can discharge when black liquid consistency reaches certain value, effectively the control pollution sources help the black liquor comprehensive regulation and alkali and reclaim.Be the technology of the cleaner production of protection environment.When the paper pulp that the present invention makes was 18-24.2% when actual consumption alkali ratio, when boiling temperature during at 145-155 ℃, screened stock hardness (permanganate number) was 8-6.1, and screened yield is more than 50%.
In sum, can effectively realize task of the present invention.
Description of drawings
Accompanying drawing 1 has provided process chart of the present invention;
Accompanying drawing 2 has provided the structural representation of digesting apparatus of the present invention;
Accompanying drawing 3 has provided last double-edged fine-toothed comb and the structural representation of middle drawing liquid double-edged fine-toothed comb in the pot body in the accompanying drawing 2;
Accompanying drawing 4 has provided the structural representation of going up double-edged fine-toothed comb in the accompanying drawing 2;
The screen holder on accompanying drawing 5 has provided in the accompanying drawing 4 on the double-edged fine-toothed comb and the structural representation of gusset;
Accompanying drawing 6 has provided the displacement filter screen in the accompanying drawing 4 and the structural representation of circulation filter screen;
Accompanying drawing 8 has provided A-A in the accompanying drawing 7 to the sectional structure schematic diagram;
Accompanying drawing 9 has provided the local enlarged diagram of the circulation filter screen in the accompanying drawing 6;
Accompanying drawing 10 has provided B-B in the accompanying drawing 9 to the sectional structure schematic diagram;
Accompanying drawing 11 has provided the structural representation of the drawing liquid double-edged fine-toothed comb in the accompanying drawing 2;
Accompanying drawing 12 provides the structural representation of the screen holder in the accompanying drawing 11;
Accompanying drawing 13 has provided the local enlarged diagram of the drum type brake filter screen in the accompanying drawing 11;
Accompanying drawing 14 has provided C-C in the accompanying drawing 13 to the sectional structure schematic diagram.
In accompanying drawing 2-14,1 be a pot body, 2 for tube still heater, 3 for the circulation heat pump, 4 for last double-edged fine-toothed comb, 5 for middle drawing liquid double-edged fine-toothed comb, 6 for displacement mouthful, 7 for upper cycling mouth, 8 for four-way pipe, 9 for middle circulation port, 10 for charging aperture, 11 for the displacement filter screen, 12 for the circulation filter screen, 13 for the upward filtration rack, 14 for last gusset, 15 for displacement filter screen taper hole, 16 for circulation filter screen taper hole, 17 for the drum type brake screen holder, 18 for a roofbolt, 19 for the pole circle, 20 for lower web plate, 21 for drum type brake filter screen taper hole.
The specific embodiment
Below the specific embodiment of 1 pair of invented technology is described as follows with reference to the accompanying drawings:
The specific embodiment 1
Behind the dry raw material preparation of wheat straw raw material through routine, rub grass with the hands by wet scrubbing and process, make its tool Purchase the primary condition of changing boiling, i.e. washing behind one-level displacement cooking, secondary displacement cooking and the pulping Wash, cold spurting. Raw material through the dehydration enter in the boiling equipment, by heat in advance to 140 ℃, The liquid ratio is 1: 7.5, it is that 60% one-level of whole boiling process total alkali content is steamed with alkali number Boil liquid and will wash water and replace out, to the heating that in boiling equipment, circulates of one-level boiling liquid, make simultaneously It is 125 ℃ of lower insulations 20 minutes, again with heat in advance to 155 ℃, liquid ratio be 1: 7.5, it is that 40% secondary boiling liquid of whole boiling process total alkali content is with one-level with alkali number Boiling liquid replaces out, to the heating that circulates in boiling equipment of secondary boiling liquid, makes it 1 simultaneously Insulation is 20 minutes under 45 ℃, then with displacement liquid secondary boiling liquid is replaced out. Use again temperature Degree is that 80 ℃ washing liquid carries out pulp washing in boiling equipment, and the temperature in boiling equipment is down to Slurry is sprayed onto spurts pot with spurting pump in the time of 100 ℃. The I and II that in said process, displaces Boiling liquid inject fresh alkali lye again heat temperature raising for next take turns the displacement ready, can repeatedly repeat to make With.
The specific embodiment 2
Behind the dry raw material preparation of straw raw material through routine, rub grass with the hands by wet scrubbing and process, make its tool Purchase the primary condition of changing boiling, i.e. washing behind one-level displacement cooking, secondary displacement cooking and the pulping Wash, cold spurting. Raw material through the dehydration enter in the boiling equipment, by heat in advance to 145 ℃, The liquid ratio is 1: 8, it is 65% one-level boiling liquid of whole boiling process total alkali content with alkali number To wash water and replace out, simultaneously to the heating that in boiling equipment, circulates of one-level boiling liquid, make its 130 ℃ of lower insulations 20 minutes, again with heat in advance to 160 ℃, liquid ratio be 1: 8, It is that 35% secondary boiling liquid of whole boiling process total alkali content is put one-level boiling liquid with alkali number Swap out and, to the heating that in boiling equipment, circulates of secondary boiling liquid, make them under 150 ℃ simultaneously Be incubated 20 minutes, then with displacement liquid secondary boiling liquid replaced out. It is 80 ℃ with temperature again Washing liquid in boiling equipment, carry out pulp washing, when the temperature in the boiling equipment is down to 100 ℃ Slurry is sprayed onto spurts pot with spurting pump. The I and II boiling liquid that displaces in said process injects Fresh alkali lye again heat temperature raising for next take turns the displacement ready, can be repeatedly used.
The specific embodiment 3
Behind the dry raw material preparation of other grass raw material through routine, rub grass with the hands by wet scrubbing and process, Make its primary condition that possesses displacement cooking, i.e. one-level displacement cooking, secondary displacement cooking and pulping After washing, cold spurting. Raw material through the dehydration enter in the boiling equipment, by heat in advance to 145 ℃, The liquid ratio is 1: 8.5, it is that 70% one-level of whole boiling process total alkali content is steamed with alkali number Boil liquid and will wash water and replace out, to the heating that in boiling equipment, circulates of one-level boiling liquid, make simultaneously It is 135 ℃ of lower insulations 20 minutes, again with heat in advance to 160 ℃, liquid ratio be 1: 8.5, it is that 30% secondary boiling liquid of whole boiling process total alkali content is with one-level with alkali number Boiling liquid replaces out, simultaneously to the heating that in boiling equipment, circulates of secondary boiling liquid, make its Insulation is 20 minutes under 150 ℃, then with displacement liquid secondary boiling liquid is replaced out. Use again Temperature is that 80 ℃ washing liquid carries out pulp washing in boiling equipment, and the temperature in boiling equipment is fallen Slurry is sprayed onto spurts pot with spurting pump during to 100 ℃. In said process, displace one, two Level boiling liquid inject fresh alkali lye again heat temperature raising take turns for next and replace readyly, can repeatedly repeat Use.
Below 2-14 further describes as follows to boiling equipment of the present invention with reference to the accompanying drawings:
With reference to the accompanying drawings, be provided with in the top charging aperture 10 arranges lower port at its lower end pot body Be provided with double-edged fine-toothed comb 4 in 1 the upper cone inner chamber, in the inner chamber of the middle bottom of pot body 1, being provided with Between drawing liquid double-edged fine-toothed comb 5, be provided with the four-way with its intracavity inter-connection in the end of the lower cone of pot body 1 Pipe 8.
Described upper double-edged fine-toothed comb is a conical filter screen, and this taper shape filter screen is positioned at upward filtration rack 13 On, and be positioned in the upper cone of pot body 1 by the upper gusset 14 that is arranged on the screen holder 13 On the wall, this taper shape filter screen is isolated into displacement filter screen 11 and circulation filter screen by the upward filtration rack with it 12 two sections divide at the pot body 1 corresponding to displacement filter screen 11 and circulation filter screen 12 Be not provided with displacement mouth 6 and upper cycling mouth 7.
Drawing liquid double-edged fine-toothed comb 5 is a circle tube leaching net in the middle of described, and this circle tube leaching net is positioned at cylinder On the formula screen holder 17, in the support body of this screen holder 17, be provided with pole circle 19 along its anchor ring, And the outer face at pole circle 19 is provided with a roofbolt 18, by being arranged on round tubular type filter screen Lower web plate 20 on the frame 17 is located in the middle bottom of pot body 1 inner chamber, corresponding to cylinder Circulation port 9 in the middle of being provided with on the pot body 1 of formula filter screen.
Be covered with respectively on described displacement filter screen 11 and circulation filter screen 12 that opening diameter is arranged is 2.5-3 The taper hole 15 and 16 of the different directions of mm, the large port of the taper hole on this displacement filter screen 11 Be positioned at the outside of filter screen, the large port of the taper hole on the circulation filter screen is positioned at the inboard of filter screen. Described Be covered with on the cylinder formula filter screen that the perforate aperture is arranged is the taper hole of the different directions of 3mm, big mouthful of this taper hole End is positioned at the inboard of filter screen.
The port of export of described tube still heater by pipeline respectively with the pot body on upper cycling mouth and four Siphunculus is connected, and the entrance point of tube still heater 2 is by the outlet phase of pipeline with circulation heat pump 3 Be communicated with, the entrance point of circulation heat pump 3 is connected with middle circulation port 9 on pot body 1.
Claims (7)
1, Dogstail pulp large liquor ratio circular heating replacing digestion technology and digesting apparatus thereof, comprise one-level displacement cooking and secondary displacement cooking, be that the grass raw material is after too wet feed preparation is handled, enter in the digesting apparatus by dehydration, by its alkali charge after heating in advance is that the first stage boiling liquid of the 50%-70% of whole digestion process total alkali content cements out washings, simultaneously to the heating that in digesting apparatus, circulates of first stage boiling liquid, and with its insulation, be that the secondary cooking liquor of the 30%-50% of whole digestion process total alkali content cements out first stage boiling liquid by its alkali charge after heating in advance again, simultaneously to the heating that in digesting apparatus, circulates of secondary cooking liquor, and with its insulation, with displacement liquid the secondary cooking liquor is cemented out again, it is characterized in that:
(1) liquor ratio of first stage boiling liquid is 1: 7.1-8.5;
(2) the first stage boiling liquid temperature of heating in advance is 140-145 ℃;
(3) temperature to first stage boiling liquid circular heating in digesting apparatus is 125-135 ℃;
(4) liquor ratio of secondary cooking liquor is 1: 7.1-8.5;
(5) temperature of heating in advance of secondary cooking liquor is 155-160 ℃;
(6) temperature to secondary cooking liquor circular heating in digesting apparatus is 145-150 ℃.
2, a kind of digesting apparatus that is used to realize the described technology of claim 1, be by being provided with charging aperture in the top, its lower end be provided with lower port the pot body, on double-edged fine-toothed comb, middle drawing liquid double-edged fine-toothed comb, four-way pipe and tube still heater and circulation heat pump form, it is characterized in that in the upper cone inner chamber of pot body, being provided with double-edged fine-toothed comb, in the inner chamber of the middle and lower part of pot body, be provided with middle drawing liquid double-edged fine-toothed comb, be provided with four-way pipe in the end of pot body lower cone with its intracavity inter-connection.
3, digesting apparatus according to claim 2, it is characterized in that double-edged fine-toothed comb is a conical filter screen, this taper shape filter screen is positioned on the screen holder, and be positioned on the upper cone inwall of pot body by the gusset that is arranged on the screen holder, this taper shape filter screen is isolated into the two sections of displacement filter screen and circulation filter screen by screen holder with it, is respectively arranged with displacement mouth and upper cycling mouth on the pot body corresponding to displacement filter screen and circulation filter screen.
4, digesting apparatus according to claim 2, the drawing liquid double-edged fine-toothed comb is a circle tube leaching net in the middle of it is characterized in that, this circle tube leaching net is positioned on the screen holder and by being arranged on the middle and lower part that gusset on the screen holder is positioned at pot body cavity, circulation port in the middle of being provided with corresponding to the pot body of circle tube leaching net.
5, according to claim 2 or 3 described digesting apparatus, it is characterized in that replacing and be covered with respectively on filter screen, the circulation filter screen that the perforate aperture is arranged is the taper hole of the different directions of 2.5-3mm, and making liquid stream send the section and the ratio of the perforate gross area is 21.6-36.9, and the big opening end that the big opening end of the taper hole on this displacement filter screen is positioned at the taper hole on the outside of filter screen, the circulation filter screen is positioned at the inboard of filter screen.
6, according to claim 2 or 4 described digesting apparatus, it is characterized in that being covered with on the circle tube leaching net that the perforate aperture is arranged is the taper hole of the different directions of 3mm, and making liquid stream send the section and the ratio of the perforate gross area is 95.5-190.4, and the big opening end of the taper hole of this circle tube leaching net is positioned at the outside of filter screen.
7, according to claim 2 or 3 described digesting apparatus, the port of export that it is characterized in that tube still heater is connected with upper cycling mouth and four-way pipe on the pot body respectively by pipeline, the entrance point of tube still heater is connected by pipeline and circulation heating delivery side of pump, and the entrance point of circulation heat pump is connected with middle circulation port on pot body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011273658A CN1151328C (en) | 2001-08-30 | 2001-08-30 | Dogstail pulp large liquor ratio circular heating replacing digestion technology and digestion equipment thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011273658A CN1151328C (en) | 2001-08-30 | 2001-08-30 | Dogstail pulp large liquor ratio circular heating replacing digestion technology and digestion equipment thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1333403A true CN1333403A (en) | 2002-01-30 |
| CN1151328C CN1151328C (en) | 2004-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011273658A Expired - Lifetime CN1151328C (en) | 2001-08-30 | 2001-08-30 | Dogstail pulp large liquor ratio circular heating replacing digestion technology and digestion equipment thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1151328C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308545C (en) * | 2003-08-26 | 2007-04-04 | 山东泉林纸业有限责任公司 | Vertical boiling pot for paper pulp |
| CN100373001C (en) * | 2004-08-25 | 2008-03-05 | 山东泉林纸业有限责任公司 | Pulping technique for fibers in grass class |
| CN101165267B (en) * | 2004-08-25 | 2010-12-08 | 山东泉林纸业有限责任公司 | Pulping technique for straw fibre |
| CN101906729A (en) * | 2009-05-08 | 2010-12-08 | 山东泉林纸业有限责任公司 | Method for continuously cooking grass raw materials and equipment used in same |
| CN101100818B (en) * | 2004-08-25 | 2011-01-05 | 山东泉林纸业有限责任公司 | Pulping technique for straw fibre |
| CN102704296A (en) * | 2012-07-09 | 2012-10-03 | 温志明 | Process for pretreating straw raw materials |
| CN102978987A (en) * | 2012-12-24 | 2013-03-20 | 江苏华机环保设备有限责任公司 | Vertical cooker |
| CN102995476A (en) * | 2011-09-09 | 2013-03-27 | 吉林化纤集团有限责任公司 | Bamboo wood dissolving pulp replacement and boiling method |
| CN104389220A (en) * | 2014-11-30 | 2015-03-04 | 重庆市雅洁纸业有限公司 | Circular heating structure of distilling pan |
-
2001
- 2001-08-30 CN CNB011273658A patent/CN1151328C/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308545C (en) * | 2003-08-26 | 2007-04-04 | 山东泉林纸业有限责任公司 | Vertical boiling pot for paper pulp |
| CN100373001C (en) * | 2004-08-25 | 2008-03-05 | 山东泉林纸业有限责任公司 | Pulping technique for fibers in grass class |
| CN101165267B (en) * | 2004-08-25 | 2010-12-08 | 山东泉林纸业有限责任公司 | Pulping technique for straw fibre |
| CN101100818B (en) * | 2004-08-25 | 2011-01-05 | 山东泉林纸业有限责任公司 | Pulping technique for straw fibre |
| CN101906729A (en) * | 2009-05-08 | 2010-12-08 | 山东泉林纸业有限责任公司 | Method for continuously cooking grass raw materials and equipment used in same |
| CN102995476A (en) * | 2011-09-09 | 2013-03-27 | 吉林化纤集团有限责任公司 | Bamboo wood dissolving pulp replacement and boiling method |
| CN102995476B (en) * | 2011-09-09 | 2015-07-22 | 吉林化纤集团有限责任公司 | Bamboo wood dissolving pulp replacement and boiling method |
| CN102704296A (en) * | 2012-07-09 | 2012-10-03 | 温志明 | Process for pretreating straw raw materials |
| CN102978987A (en) * | 2012-12-24 | 2013-03-20 | 江苏华机环保设备有限责任公司 | Vertical cooker |
| CN104389220A (en) * | 2014-11-30 | 2015-03-04 | 重庆市雅洁纸业有限公司 | Circular heating structure of distilling pan |
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| CN1151328C (en) | 2004-05-26 |
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