CN101580285A - Thermal cracking device for papermaking black liquor of non-wood material - Google Patents
Thermal cracking device for papermaking black liquor of non-wood material Download PDFInfo
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- CN101580285A CN101580285A CNA2009101283878A CN200910128387A CN101580285A CN 101580285 A CN101580285 A CN 101580285A CN A2009101283878 A CNA2009101283878 A CN A2009101283878A CN 200910128387 A CN200910128387 A CN 200910128387A CN 101580285 A CN101580285 A CN 101580285A
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Abstract
The invention discloses a black liquor cracking device which performs alkali recovery process when non-wood material is adopted for papermaking. The device comprises at least two preheaters which are mutually connected in series, flash evaporators with identical quantity to that of the preheaters and mutually connected in series, and a medium temperature thermal cracking reactor with a heating coil inside; the liquor outlet tube of each preheater is communicated with the liquor inlet tube of each corresponding preheater; the liquor inlet tube of the first-stage preheater is communicated with a black liquor tube; the liquor outlet tube of the last-stage preheater is communicated with the liquor inlet of a black liquor pump; the liquor output of the black liquor pump is communicated with the liquor inlet tube of the cracking reactor; the liquor output tube of the cracking reactor is communicated with the liquor inlet tube of the first-stage flash evaporator; the liquor outlet tube of each flash evaporator is communicated with the liquor inlet tube of the next-stage flash evaporator; the liquor outlet tube of the last-stage flash evaporator is communicated with a black liquor evaporator; and the steam outlets of the flash evaporators are communicated with the steam inlets of the preheaters.
Description
Technical field
The present invention relates to a kind of with handle the device that the black liquid coordinative composition of equipments uses, be a kind of during exactly with non-wood material papermaking, the supporting black liquor cracker that carries out alkali recovery process.
Background technology
In China, the forest reserves are deficient relatively, and wood material can not satisfy the needs of paper industry far away, for solving ever-increasing paper social demand and resource scarcity contradiction between the two, will utilize the non-wood raw material more.According to statistics, the non-wood raw material accounts for about 74% of China's paper pulp ultimate production, and in the quite a long time, the non-wood raw material remains the main raw material of China's paper industry, and proportion big variation can not take place.
Black digestion liquid is the main root that causes the paper industry environmental pollution, just administers directly discharging as not adding, and is very serious to the harm that social environment causes.At present, the method for more effectively administering still adopts chemical recovery system.For this reason, State Environmental Protection Administration's explicit order regulation, all paper making pulp industry all must supporting chemical recovery system.But the alkali of non-wood material papermaking reclaims more difficulty is arranged, this mainly is because silicon content is big in the non-wood material black liquor, viscosity is high, and further evaporation concentration difficulty is strengthened.Experimental data shows, when the non-wood material black liquid consistency surpassed 35%, viscosity rose rapidly, and concentration was by 45% o'clock, and under 90 ℃, viscosity can reach more than the 200mpas, and the range of viscosities that can not carry near impeller pump institute can't continue to evaporate again.Therefore, the highest design load of non-wood material black liquor vaporizing concentration all is no more than 45% at present, and the concentration that enters the alkali stove is no more than 50%.Because papermaking black liquor of non-wood material viscosity is too high, causes alkali furnace operating difficulty, even need to use heavy oil combustion supporting, make alkali reclaim economy and reduce greatly that alkali recovery is not high.Prior art is to solve aforesaid problem by the mode of setting up cascade evaporator, but its effect is still undesirable.
Summary of the invention
The invention provides a kind of too high black liquor thermal cracker of black liquor viscosity that non-wood material papermaking exists that solves.
Thermal cracking device for papermaking black liquor of non-wood material of the present invention is by at least two mutual placed in-line preheaters, mutual series connection and the quantity flasher identical with preheater quantity, with and in be provided with heating coil in warm cracking reactor constitute, wherein the liquid-inlet pipe of first step preheater is communicated with the black liquor pipe, its drain pipe is communicated with the liquid-inlet pipe of second stage preheater, the drain pipe of final stage preheater is communicated with the fluid inlet of black liquor pump, the liquid outlet of black liquor pump is communicated with the liquid-inlet pipe of cracking reactor, the cracking reactor drain pipe is communicated with the liquid-inlet pipe of first step flasher, the drain pipe of first step flasher is connected with the liquid-inlet pipe of second stage flasher, the drain pipe of final stage flasher is communicated with Black Liquid Evaporator, and the vapour outlet of flasher is communicated with the steam-in of preheater.
The most preferred embodiment of apparatus of the present invention is to be provided with three grades of preheaters and three grades of flashers in device.
During the best of apparatus of the present invention was implemented, the vapour outlet of m level flasher was connected with the steam-in of n level preheater, wherein: m=1,2,3; N=3,2,1.
By the array preheater black liquor is heated step by step among the present invention, in processed black liquor being heated gradually enter to the higher temperature in the warm cracking reactor, in utilize in the warm cracking reactor coil pipe to continue black liquor is heated, make it reach the scission reaction temperature, macromolecular chain with black liquor under the medium temperature and medium pressure environment interrupts, make it to form small-molecule substance, greatly reduce the viscosity of black liquor, increased its flowability, made it possess the condition that under high density, continues evaporation and carry.
The viscosity of the black liquor of warm cracking reactor is very big in entering, in can be to conduct heat basically when being heated in the warm cracking reactor with conduction pattern, its heat transfer efficiency is extremely low.For addressing this problem, can adopt any following technical measures:
1, in be provided with by motor-driven agitating vane, perhaps in the warm cracking reactor
2, in the bottom of warm cracking reactor be provided with the annular vapour pipe in addition, offer spray orifice on the annular steam pipe, each spray orifice axis with in the axis angle of warm cracking reactor be 45 degree, make all spray orifices all point to the axis of cracking reactor, form the steam back-blowing device, when steam when each aperture blows out, when playing, can drive in the cracking reactor black liquor and produce and roll the black liquor heat effect.
Above-mentioned two kinds of structures of the present invention can be under blade stirs when work, perhaps under the effect of vapo(u)r blasting, black liquor is rolled, form turbulent flow, can improve the rate of heating of black liquor like this, strengthen heat exchanger effectiveness, make that the heat transfer coefficient of steam is multiplied in black liquor and the coil pipe, both can shorten black liquor heat-up time greatly, also can reduce the heat interchanging area of steam coils, reduce equipment investment cost, and can reduce steam consumption; Test is also found, because black liquor is in the turbulent motion state, make that producing the phase mutual friction between the black liquor molecular chain involves, can improve black liquor cracked efficient, reduce black liquor in residence time in the warm cracking reactor, make black liquor in the short period section, finish cracking, effectively improve the productive rate of equipment.
Thermal cracking device for papermaking black liquor of non-wood material can be used as a stage of traditional vapo(u)rization system among the present invention, finishes because the work that can't finish with the increase of concentration rising viscosity.The present invention utilizes thermal cracking device for papermaking black liquor of non-wood material under the medium temperature and medium pressure environment macromolecular chain to be interrupted, make it to form small-molecule substance, can reduce black liquor viscosity greatly, increase mobile, make it possess the condition that continues evaporation and carry under high density, final evaporative concn can reach 60%.Can save the cascade evaporator in the traditional technology behind employing the present invention, black liquor after the present invention the handles high black liquid after handling from vaporizer again can directly enter into the alkali stove and burns, and alkali stove heavy oil combustion supporting of the prior art like this system can give it up fully.
Description of drawings
Accompanying drawing 1 is a black liquor thermal cracker synoptic diagram of the present invention.
Accompanying drawing 2 is a preheater internal structure synoptic diagram.
Accompanying drawing 3 is for having the cracking reactor structural representation of whipping appts.
Accompanying drawing 4 is for having the cracking reactor structural representation of steam back-blowing device.
Accompanying drawing 5 is a steam back-blowing device coil pipe enlarged view.
Wherein: 1 is black liquor cracking front evaporator device, 2 is the preheater steam inlet tube, 3 is the one-level preheater, 4 is the secondary preheater, 5 is three grades of preheaters, 6 is the reactor black liquid outlet, 7 be in warm cracking reactor, 8 is middle temperature steam inlet tube, 9 is the black liquor pump, 10 is the one-level flasher, and 11 is the two-stage flash device, and 12 is three grades of flashers, 13 is black liquor cracking finisher, 14 are the paddle oar in the warm cracking reactor in being arranged at, and 15 is the steam jet on the annular steam pipe, and 16 is annular steam pipe.
Embodiment
The basic structure of the most preferred embodiment of thermal cracking device for papermaking black liquor of non-wood material of the present invention is seen accompanying drawing.Have in device of the present invention by three mutual placed in-line preheaters 3,4 and 5, preheater of the present invention is an interchanger, referring to accompanying drawing 2.Also have quantity three flashers 10,11 and 12 identical in the device of the present invention with preheater quantity, with and in be provided with the cracking reactor 7 of heating tube 8.Wherein the liquid-inlet pipe of first step preheater 3 is communicated with the black liquor pipe, its drain pipe is communicated with the liquid-inlet pipe of second stage preheater 4, the drain pipe of second stage preheater 4 is communicated with the liquid-inlet pipe of third stage preheater 5, the drain pipe of third stage preheater 5 is communicated with the fluid inlet of black liquor pump 9, the liquid outlet of black liquor pump 9 is communicated with the liquid-inlet pipe of cracking reactor 7, the drain pipe of cracking reactor 7 is communicated with the liquid-inlet pipe of first step flasher 10, the drain pipe of first step flasher 10 is connected with the liquid-inlet pipe of second stage flasher 11, the drain pipe of second stage flasher 11 is connected with the liquid-inlet pipe of third stage flasher 12, the drain pipe of third stage flasher 12 is communicated with the Black Liquid Evaporator of soda recovery unit, the vapour outlet of first step flasher 10 is connected with the steam-in of third stage preheater 5, the vapour outlet of second stage flasher 11 is connected with the steam-in of second stage preheater 4, and the vapour outlet of third stage flasher 12 is connected with the steam-in of first step preheater 3.
The present invention utilizes traditional vapo(u)rization system to combine with thermal cracking device for papermaking black liquor of non-wood material when work, extract and enter the flash distillation of IV single-effect evaporator flashing chamber after the rare black liquor that comes reaches finite concentration through allotment, enter V single-effect evaporator flashing chamber then, enter the VI single-effect evaporator after the secondary flash distillation, begin to carry out VI, V, IV, III, the typical full countercurrent evaporation flow process of II by the VI single-effect evaporator, carry papermaking black liquor of non-wood material dense step by step, to the II single-effect evaporator, obtain concentration and be between 35%～40%, temperature is greatly about 95 ℃ black liquor.This black liquor is introduced device of the present invention, utilize its temperature that has and preliminary cracking condition, adopt step by step that type of heating is preheating to certain temperature with black liquor, through after three grades of preheatings black liquor being heated to more than 160 ℃ from 95 ℃; With warm cracking reactor in being pumped into, heat once more again, cracking takes place in medium temperature and medium pressure (1.2MPa, 180～190 ℃) and certain hour change, its viscosity is reduced greatly through steam, and irreversible.Cleaved black liquor enters flasher again and carries out flash distillation except that temperature, is provided with three grades of flashers in the device of the present invention.From reducing to more than 180 ℃ about 110 ℃, the heat that reclaims through flasher feeds back in the preheater again simultaneously, and heat is fully utilized through black liquor temperature after three grades of flash distillations.The I single-effect evaporator that returns chemical recovery system behind the hot cracked device continues inspissation, reaches 60～65% to concentration, directly enters into the burning of alkali stove.
Claims (5)
1, thermal cracking device for papermaking black liquor of non-wood material, it is characterized in that by at least two mutual placed in-line preheaters, mutual series connection and the quantity flasher identical with preheater quantity, with and in be provided with heating coil in warm cracking reactor constitute, wherein the liquid-inlet pipe of first step preheater is communicated with the black liquor pipe, its drain pipe is communicated with the liquid-inlet pipe of second stage preheater, the drain pipe of final stage preheater is communicated with the fluid inlet of black liquor pump, the liquid outlet of black liquor pump is communicated with the liquid-inlet pipe of cracking reactor, the cracking reactor drain pipe is communicated with the liquid-inlet pipe of first step flasher, the drain pipe of first step flasher is connected with the liquid-inlet pipe of second stage flasher, the drain pipe of final stage flasher is communicated with Black Liquid Evaporator, and the vapour outlet of flasher is communicated with the steam-in of preheater.
2, thermal cracking device for papermaking black liquor of non-wood material according to claim 1 is characterized in that being provided with in the device three grades of preheaters and three grades of flashers.
3, thermal cracking device for papermaking black liquor of non-wood material according to claim 2 is characterized in that the vapour outlet of m level flasher is connected with the steam-in of n level preheater, wherein: m=1,2,3; N=3,2,1.
4, according to claim 1 or 2 or 3 described thermal cracking device for papermaking black liquor of non-wood material, be provided with agitating vane in the warm cracking reactor in it is characterized in that.
5, according to claim 1 or 2 or 3 described thermal cracking device for papermaking black liquor of non-wood material, the bottom of warm cracking reactor is provided with the annular vapour pipe in addition in it is characterized in that, offer spray orifice on the annular steam pipe, each spray orifice axis with in the axis angle of warm cracking reactor be 45 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101283878A CN101580285A (en) | 2009-04-01 | 2009-04-01 | Thermal cracking device for papermaking black liquor of non-wood material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101283878A CN101580285A (en) | 2009-04-01 | 2009-04-01 | Thermal cracking device for papermaking black liquor of non-wood material |
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| CN101580285A true CN101580285A (en) | 2009-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009101283878A Pending CN101580285A (en) | 2009-04-01 | 2009-04-01 | Thermal cracking device for papermaking black liquor of non-wood material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092804B (en) * | 2009-12-11 | 2012-08-22 | 山东太阳纸业股份有限公司 | Zero-emission treatment method for wastewater of chemi-mechanical pulp |
| CN106336061A (en) * | 2016-10-31 | 2017-01-18 | 万华化学集团股份有限公司 | Method for treating high-concentration isobutylene wastewater through PO by-product TBA pyrolysis |
| CN113967337A (en) * | 2021-10-25 | 2022-01-25 | 四川众友联合实业有限公司 | Organic glass waste degradation process with high thermal efficiency |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1288203C (en) * | 1985-11-29 | 1991-09-03 | Erkki Kiiskila | Method of decreasing black liquor viscosity |
| CN1161392A (en) * | 1996-01-30 | 1997-10-08 | 阿尔斯特罗姆机器有限公司 | Method of heat treating black liquor |
| CN1294221A (en) * | 1999-10-30 | 2001-05-09 | 兰州节能环保工程有限责任公司 | Thermo-degradable cracking process for treating black liquid of chemical pulping |
-
2009
- 2009-04-01 CN CNA2009101283878A patent/CN101580285A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1288203C (en) * | 1985-11-29 | 1991-09-03 | Erkki Kiiskila | Method of decreasing black liquor viscosity |
| CN1161392A (en) * | 1996-01-30 | 1997-10-08 | 阿尔斯特罗姆机器有限公司 | Method of heat treating black liquor |
| CN1294221A (en) * | 1999-10-30 | 2001-05-09 | 兰州节能环保工程有限责任公司 | Thermo-degradable cracking process for treating black liquid of chemical pulping |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092804B (en) * | 2009-12-11 | 2012-08-22 | 山东太阳纸业股份有限公司 | Zero-emission treatment method for wastewater of chemi-mechanical pulp |
| CN106336061A (en) * | 2016-10-31 | 2017-01-18 | 万华化学集团股份有限公司 | Method for treating high-concentration isobutylene wastewater through PO by-product TBA pyrolysis |
| CN106336061B (en) * | 2016-10-31 | 2020-01-31 | 万华化学集团股份有限公司 | Treatment method of high-concentration wastewater from cracking PO byproduct TBA to prepare isobutene |
| CN113967337A (en) * | 2021-10-25 | 2022-01-25 | 四川众友联合实业有限公司 | Organic glass waste degradation process with high thermal efficiency |
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| PB01 | Publication | ||
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Application publication date: 20091118 |