CN101831826A - Paper making pulping black liquid crystallization and evaporation method - Google Patents
Paper making pulping black liquid crystallization and evaporation method Download PDFInfo
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- CN101831826A CN101831826A CN 201010205198 CN201010205198A CN101831826A CN 101831826 A CN101831826 A CN 101831826A CN 201010205198 CN201010205198 CN 201010205198 CN 201010205198 A CN201010205198 A CN 201010205198A CN 101831826 A CN101831826 A CN 101831826A
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Abstract
The invention relates to a paper making pulping black liquid crystallization and evaporation method which comprises the following steps of: sending a black liquid from a first effect evaporator into a black liquid mixing tank, adding alkali ash and/or mirabilite, mixing with the black liquid to generate a mixed black liquid, and enabling the mixed black liquid to contain excess sulfate to become a sulfate supersaturated liquid; sending one part of the obtained mixed black liquid to a crystallization and densification evaporator for evaporation, and sending the evaporated black liquid to a pressure black liquid tank for storage; mixing one part of the black liquid with the black liquid from a second effect evaporator to sequentially enter three chambers of the first effect evaporator for evaporation, and sending into the black liquid mixing tank after evaporation. The invention can effectively avoid the scale formation of the black liquid in the evaporation process, obtains higher concentration of the black liquid, is beneficial to alkali reclamation and has lower energy consumption.
Description
Technical field
The present invention relates to a kind of method of evaporating of paper-making pulping black liquor, especially relate to a kind of method of evaporating of high black liquid.
Background technology
What present paper industry alkali recovery process adopted is firing method mostly, roughly is divided into extraction, evaporation, burning, causticization and lime and reclaims five workshop sections, and wherein black liquor vaporizing is very important, is directly connected to production efficiency and efficiency of energy utilization that alkali reclaims.The composition of black liquor is complicated, can be divided into organic matter and inorganic matter two parts substantially, two-part composition and ratio are different and different with pulping raw material and manufacturing condition, wherein organic matter accounts for 2/3rds, inorganic matter accounts for 1/3rd, organic matter is mainly derived from the lignin of plant fiber material stripping in digestion process, hemicellulose and cellulosic catabolite and organic acid etc., it is the main source that produces combustion heat value, it is high more to advance alkali recovery furnace burning black liquid consistency, the alkali recovery furnace operation is safety and stability more, and the thermal efficiency is also high more, can also reduce the discharge capacity of alkali recovery furnace sulfur dioxide and total reducibility sulfuration thing simultaneously.People thirst for obtaining the black liquor of high concentration in the black liquor vaporizing process, but because of the easy fouling of high black liquid, and the heat transfer coefficient of dirt that Black Liquid Evaporator is tied declines to a great extent the evaporate station evaporability less than 1/10th of carbon steel.It is 65% black liquor that advanced plate-type down-film evaporator can obtain concentration, when black liquid consistency surpasses 65%, the growth rate of black liquor viscosity surpasses the growth rate of concentration, mineral concentration in the black liquor has surpassed its solubility, the sodium salt precipitation, produce fouling, have a strong impact on the evaporability of evaporimeter.
The board-like falling liquid film black liquor vaporizing of six effects is than mature technique, its black liquor flow process is: rare black liquor mix with half dope carry dense to about the 19wt%, at first enter IV and imitate the flash distillation of plate-type down-film evaporator flash drum, enter V effect plate-type down-film evaporator flash drum flash distillation → VI then successively and imitate plate-type down-film evaporator → V effect plate-type down-film evaporator → IV effect plate-type down-film evaporator → half concentrated black liquid groove → III effect plate-type down-film evaporator → II effect plate-type down-film evaporator → I (A, B, C three Room) imitate the plate-type down-film evaporator evaporation, from I (A, B, C three Room) single-effect evaporator goes out concentrated black liquid, finally goes out concentrated black liquid by I effect concentrated black liquid flash tank and send the concentrated black liquid groove to store.The steam flow of evaporate station is that I (A, B, C chamber) → II → III → IV → V → VI is imitated, the indirect steam of generation is imitated by the plate-type condenser condensation in the end, wherein use live steam as the thermal source except that the I single-effect evaporator, all the other each single-effect evaporators all adopt indirect steam as thermal source; The flow process of the condensed water of evaporate station is that the cleaning condensed water that the I effect produces is sent the boiler room back to, the condensed water discharge that produces is imitated at the end, the foul condensate that all the other each effects produce is delivered to every next effect and is carried out flash distillation, and the indirect steam that flashes off uses as the supplemental heat source of every 1st effective evaporator down.Adopt this flow process can obtain the concentrated black liquid of solid concentration 60wt%～65wt%, but high temperature is imitated (I is imitated and the II effect) easy fouling of evaporimeter.Thereby most black liquor vaporizings station I imitates by three Room (A, B, C) design, and a Room is cleaned with rare black liquor or cleaning fluid, and other two Room are used for evaporation, and changeable in the production process, each chamber is cleaned in turn, with cleaning and the raising evaporation efficiency that keeps heat-transfer area.Sometimes II is imitated by the design of two Room, to reduce concentration gradient.In addition, it also is than mature technique that five effects, seven are imitated board-like falling liquid film black liquor vaporizing, imitates board-like falling liquid film black liquor vaporizing technology with respect to six, only consume difference to some extent in investment and evaporated vapor, the effect number is many more, invests big more, but evaporate the identical water yield, steam consumption is low more.
" recovery of soda pulping process chemicals " third edition that China Light Industry Press publishes in August, 1998, the 32nd page to 43 pages flow process and the equipment of introducing the black liquor multiple-effect evaporation, 6-7 single-effect evaporator system is made up of evaporimeter and enrichment evaporimeter, production concentration is the concentrated black liquid of 68wt%～75wt%, but crystallization enrichment evaporimeter production concentration is the concentrated black liquid of 75wt%～80wt%.But the energy consumption that needs because of the circulation of enrichment evaporimeter black liquor is big, and power consumption is higher, the steam consumption height of the ev u water yield, and equipment investment increases; Can not solve the problem of concentrated black liquid easy fouling in evaporimeter of the above concentration of 60wt%.
Chinese patent application CN101629393A discloses a kind of black liquor of pulp making film-falling crystallization and evaporation process on January 20th, 2010, comprise the steps: at first black liquor of pulp making to be transported in the II single-effect evaporator, part black liquor of pulp making is transported in the black liquor of pulp making flash tank, in the black liquor of pulp making flash tank, be lowered temperature, be transported to then in the black liquor of pulp making mixing channel, adding sode ash in the black liquor of pulp making mixing channel makes it mix with black liquor of pulp making, to be transported in the II single-effect evaporator with the mixed black liquor of pulp making of sode ash again, and then black liquor of pulp making in the II single-effect evaporator is transported in the I single-effect evaporator, make the black liquor in I effect and the II single-effect evaporator contain enough sode ashs, thereby avoid inorganic salts fouling on the heating surface of I effect and II single-effect evaporator.Adopt this patent application disclosed method, when reaching the 50wt% left and right sides because of the black liquor of pulp making concentration that goes out the II single-effect evaporator, black liquor is transferred out, can limit the raising of final black liquid consistency, only add simultaneously sode ash, the sode ash amount that produces because of the alkali recovery boiler might deficiency so that form enough nuclei of crystallization in the black liquor vaporizing process, can not effectively avoid fouling of evaporator.
Summary of the invention
Technical problem to be solved by this invention provides a kind of black liquor vaporizing method, and it can effectively avoid the black liquor fouling in the evaporation process, obtain higher black liquid consistency, and energy consumption is lower.
The basic technical scheme of the inventive method comprises the following steps:
Step 1, the black liquor that will go out the I single-effect evaporator are delivered in the black liquor mixing channel, add sode ash and/or saltcake in the black liquor mixing channel, mix with black liquor to generate and mix black liquor, make in the mixing black liquor and contain excessive sulfate, become sulfate supersaturation liquid;
Step 2, the mixing black liquor that step 1 is obtained are divided into two parts, a part is sent to crystallization enrichment evaporator evaporation, remainder is with after the black liquor that goes out the II single-effect evaporator mixes, (the I single-effect evaporator press A, B, C three Room are designed to enter evaporation in three chambers of I single-effect evaporator successively, so that clean), the black liquor that goes out the I single-effect evaporator returns step 1; Mix black liquor and be sent to crystallization enrichment evaporimeter and imitate the weight or volume ratio that black liquor mixes, contain excessive sulfate, become sulfate supersaturation liquid, just can implement as long as can satisfy in the black liquor that obtains after making it and the black liquor that goes out the II single-effect evaporator mixing with going out II.
Step 3, step 2 is sent to black liquor after the crystallization enrichment evaporator evaporation is sent to pressure black liquor groove and stores.
As the first kind of improvement project that realizes basic technical scheme of the present invention, the black liquor that will go out the I single-effect evaporator is sent in the black liquor mixing channel after the flash distillation of black liquor flash tank again, and then in the black liquor mixing channel with sode ash or/and saltcake mix.
Second kind of improvement project is in step 1, will go out I single-effect evaporator black liquor solid concentration and be controlled at 58wt%～66wt%, more preferably 60wt%～65wt%.
The third improvement project is the black liquor after the step 3 crystallization enrichment evaporator evaporation to be sent to pressure black liquor groove again to store after the flash distillation of super concentrated black liquid flash tank.
The 4th kind of improvement project be, will be sent to crystallization enrichment evaporimeter with sode ash and/or saltcake mixing black liquor in the step 2 and to imitate the weight or volume ratio that black liquor mixes be 2～5:1, more preferably 3:1 with going out II.
The 5th kind of improvement project is that sode ash is or/and the addition of saltcake is the 4wt%～8wt% of black liquor solid amount.
The 6th kind of improvement project is that it is 41wt%～55wt% that step 2 goes out II effect black liquor solid concentration.
The 7th kind of improvement project be, will go out the steam that I single-effect evaporator black liquor produces and send the III single-effect evaporator after the flash distillation of black liquor flash tank, and the black liquor after the crystallization enrichment evaporator evaporation send the II single-effect evaporator through the steam of super concentrated black liquid flash tank flash distillation generation.
More than the employing capable of being combined of each improvement project.
The invention has the beneficial effects as follows: black liquor is mixed with sode ash and/or saltcake, make to mix in the black liquor and contain excessive sulfate, become sulfate supersaturation liquid, the deficiency of avoiding occurring because of sulfate in the black liquor makes sodium carbonate crystallization occur in concentration process, precipitation is attached to I single-effect evaporator and crystallization enrichment evaporimeter heat-transfer surface surface scale, improved the concentrated black liquid solid content 5wt%～20wt% of evaporate station; Because of evaporimeter heat-transfer surface surface non-scaling, reduced the cleaning and descaling time of evaporimeter, guaranteed the even running of evaporimeter, improved the utilization ratio and the economic benefit of evaporimeter.The high black liquor of alkali recovery boiler burning solid content, can improve the disposal ability 5%～20% of alkali furnace black liquid, the boiler tube bundle of alkali recovery boiler and the clogging phenomenon of economizer have been reduced, reduce the consumption of blowing grey steam, reduced the water yield of bringing in the black-liquor combustion process, the alkali recovery boiler thermal efficiency improves, and steam production increases, can prevent the dying embers and the fire extinguishing phenomenon of burner hearth inner cushion layer effectively, and improve the saltcake percent reduction.
Be sent to crystallization enrichment evaporator evaporation with a sode ash and/or the mixed black liquor part of saltcake, a part with go out II and imitate and to be sent to the I single-effect evaporator after black liquor mixes and to evaporate, make the black liquor in the I single-effect evaporator become sulfate supersaturation liquid, and generation crystalline deposit, and with this crystalline particle as nucleus, more crystallization is carried out on nucleus, crystallization appears in the device heating surface that avoids evaporating, can effectively avoid the fouling of I single-effect evaporator, black liquor enters successively in three chambers of I single-effect evaporator and evaporates, can improve the black liquid consistency that the I single-effect evaporator, reduce the water yield of crystallizing evaporator evaporation, thereby improve the efficiency of energy utilization of evaporate station, reduced black liquor and concentrated required energy consumption.
The addition outbalance of sode ash and saltcake, if the sode ash or the saltcake quantity not sufficient that add, can make the sodium carbonate in the black liquor crystallization in concentration process, occur, precipitation is attached to evaporimeter heat-transfer surface surface, form layer of scale, reduce the heat exchange property and the capacity of equipment of evaporimeter, and increase the washing workload.Adopt improved technical scheme, add Na in the preferred black liquor mixing channel
2SO
4And the amount of sode ash, can make alkali reclaim the white liquid sulphidity that obtains and remain in 30%, be fit to the pulping and digesting requirement, and can reduce cost, make the stable operation of alkali recovery boiler; Preferred black liquid consistency can make black liquor more easily become supersaturation liquid, reduce the addition of saltcake and/or sode ash, thereby easily produce crystalline deposit, and with this crystalline particle as nucleus, more crystallization is carried out on nucleus, the device heating surface that avoids evaporating goes out to imitate crystallization, thereby avoids evaporating the fouling of device heating surface effectively, to keep the cleaning of heat-transfer area.
Description of drawings
Accompanying drawing is a FB(flow block) of the present invention.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Black liquor vaporizing is except that evaporating by the board-like falling film evaporation of multiple-effect station flow process and technology, and is further comprising the steps of:
Step 1, the black liquor that will go out the I single-effect evaporator are delivered in the black liquor mixing channel, add sode ash and/or saltcake mixes with black liquor in the black liquor mixing channel, generate the mixing black liquor, make in the mixing black liquor and contain excessive sulfate, become sulfate supersaturation liquid;
Step 2, the mixing black liquor that step 1 is obtained are divided into two parts, and a part is sent to crystallization enrichment evaporator evaporation; Remainder with go out II single-effect evaporator black liquor and mix, make in its mixed black liquor and contain excessive sulfate, become sulfate supersaturation liquid, be sent to the evaporation of I single-effect evaporator after the mixing, black liquor enters evaporation in three chambers of I single-effect evaporator (the I single-effect evaporator press A, B, the design of C three Room, so that cleaning) successively;
Step 3, step 2 is sent to black liquor after the crystallization enrichment evaporator evaporation is sent to pressure black liquor groove and stores.
In the implementation process, in step 1, go out I single-effect evaporator black liquor solid concentration and preferably be controlled at 58wt%～66wt%, more preferably 60wt%～65wt%; Step 1 goes out I single-effect evaporator black liquor and preferably is sent in the black liquor mixing channel after the flash distillation of black liquor flash tank again, and then in the black liquor mixing channel with sode ash or/and saltcake mix; Black liquor after the step 3 crystallization enrichment evaporator evaporation preferably is sent to pressure black liquor groove again and stores after the flash distillation of super concentrated black liquid flash tank; In the step 2 with sode ash and/or saltcake mix black liquor be sent to crystallization enrichment evaporimeter and with go out II and imitate the ratio of the quantity that black liquor mixes, as long as can satisfy in the black liquor that obtains after making it and the black liquor that goes out the II single-effect evaporator mixing and contain excessive sulfate, become sulfate supersaturation liquid, just can implement, but preferably be sent to crystallization enrichment evaporimeter and to imitate the ratio of the black liquor weight or volume that black liquor mixes be 2～5:1, more preferably 3:1 with going out II; Sode ash in the step 1 is or/and the addition of saltcake is preferably the 4wt%～8wt% of black liquor solid amount, more preferably 5wt%～7wt%; Step 2 goes out II effect black liquor solid concentration and is preferably 41wt%～55wt%; Go out the steam that I single-effect evaporator black liquor produces after the flash distillation of black liquor flash tank, the steam that black liquor after the crystallization enrichment evaporator evaporation produces through super concentrated black liquid flash tank flash distillation, can and be sent to evaporate station according to its temperature and pressure and respectively imitate the principle that the temperature and pressure of steam chest is complementary, be sent to corresponding evaporation and imitate utilization, with energy savings, add in the crystallization and evaporation station as imitating board-like falling liquid film black liquor vaporizing six, go out the steam that I single-effect evaporator black liquor produces and preferably send the III single-effect evaporator after the flash distillation of black liquor flash tank, the black liquor after the crystallization enrichment evaporator evaporation preferably send the II single-effect evaporator through the steam of super concentrated black liquid flash tank flash distillation generation.In the implementation process, because of alkali reclaims evaporization process and alkali stove burning operation is often arranged apart, if two-step apart from each other, collection convenience for alkali stove sode ash, the black liquor storage capability of raising system, the black liquor mixing channel in the step 1 can be arranged on the burning operation, goes out I effect black liquor storagetank and add one at evaporization process, the black liquor that goes out I effect black liquor storagetank is delivered in the black liquor mixing channel again, does not influence enforcement of the present invention.
Embodiment 1:
Imitating board-like falling film evaporation six adds in the evaporation process of crystallization and evaporation, going out I single-effect evaporator solid concentration is the black liquor of 60wt%, after the flash distillation of black liquor flash tank, deliver in the black liquor mixing channel, by the total of sending into black liquor solid in the black liquor mixing channel, add 7wt% and come from the sode ash that the alkali recovery boiler is collected, mix the back generation with black liquor and mix black liquor, mix black liquor this moment becomes supersaturation liquid, and generation crystalline deposit, as nucleus, more crystallization is carried out with this crystalline particle on nucleus, prevented that the evaporimeter heating surface goes out to imitate crystallization in the subsequent evaporation process, thereby effectively avoid evaporating the fouling of device heating surface, to keep the cleaning of heat-transfer area; Obtain and the mixed black liquor that mixes of sode ash, by volume (or weight) is than being divided into 4 parts, wherein 3 parts are sent to crystallization enrichment evaporator evaporation, the steam that crystallization enrichment evaporimeter uses is the saturated vapor of 0.22～0.26Mpa, the black liquor solid concentration that goes out crystallization enrichment evaporimeter is 76wt%, after the flash distillation of super concentrated black liquid flash tank, be sent to pressure concentrated black liquid groove again and store, send the alkali recovery boiler to use according to the needs of alkali recovery boiler; Wherein 1 part is to be sent to the evaporation of I single-effect evaporator after the black liquor of 48wt% mixes with going out II single-effect evaporator concentration, black liquor evaporates in three chambers of I single-effect evaporator by the order of A chamber → B chamber → C chamber, the steam that the I single-effect evaporator uses is the saturated vapor of 0.15～0.20Mpa, the black liquor solid concentration that goes out the I single-effect evaporator is 60wt%, is sent in the black liquor mixing channel to store and mix with sode ash, saltcake after the flash distillation of black liquor flash tank.Under this method of operation, scale formation does not all appear in I single-effect evaporator and crystallization enrichment evaporimeter heat-transfer surface surface, and alkali recovery boiler burning solid concentration is the black liquor of 76wt%, and the black liquor of the 60wt% that burns improves production capacity 10%, and steam production improves 20%.
Embodiment 2:
Imitating board-like falling film evaporation six adds in the evaporation process of crystallization and evaporation, going out I single-effect evaporator solid concentration is the black liquor of 65wt%, after the flash distillation of black liquor flash tank, deliver in the black liquor mixing channel, by the total of sending into black liquor solid in the black liquor mixing channel, add 8wt% and come from the saltcake that alkali reclaims the collection of alkali stove, mix the back generation with black liquor and mix black liquor, mix black liquor this moment becomes supersaturation liquid, and generation crystalline deposit, as nucleus, more crystallization is carried out with this crystalline particle on nucleus, prevented that the evaporimeter heating surface goes out to imitate crystallization in the subsequent evaporation process, thereby effectively avoid evaporating the fouling of device heating surface, to keep the cleaning of heat-transfer area; Obtain and the mixed black liquor that mixes of saltcake, by volume (or weight) is than being divided into 6 parts, wherein 5 parts are sent to crystallization enrichment evaporator evaporation, the steam that crystallization enrichment evaporimeter uses is the saturated vapor of 0.22～0.26Mpa, the black liquor solid concentration that goes out crystallization enrichment evaporimeter is 80wt%, after the flash distillation of super concentrated black liquid flash tank, be sent to pressure concentrated black liquid groove again and store, send the alkali recovery boiler to use according to the needs of alkali recovery boiler; Wherein 1 part with going out II to imitate concentration be to be sent to the I single-effect evaporator after the black liquor of 41wt% mixes to evaporate, the order that black liquor is pressed B chamber → A chamber → C chamber is evaporated (the I single-effect evaporator is pressed A, B, the design of C three Room) in three chambers of I single-effect evaporator, the steam that the I single-effect evaporator uses is the saturated vapor of 0.15～0.20Mpa, the black liquor solid concentration that obtains out the I single-effect evaporator is 58wt%, is sent in the black liquor mixing channel to store and mix with sode ash, saltcake after the flash distillation of black liquor flash tank.Under this method of operation, scale formation does not all appear in I single-effect evaporator and crystallization enrichment evaporimeter heat-transfer surface surface, and alkali recovery boiler burning solid concentration is the black liquor of 80wt%, the black liquor of the 65wt% that burns, improve more than the production capacity 5wt%, steam production improves 22wt%.
Embodiment 3:
Imitating board-like falling film evaporation six adds in the evaporation process of crystallization and evaporation, going out I single-effect evaporator solid concentration is the black liquor of 58wt%, after the flash distillation of black liquor flash tank, deliver in the black liquor mixing channel, by the total of sending into black liquor solid in the black liquor mixing channel, add 2wt% and come from the sode ash of alkali recovery boiler collection and the saltcake of 2wt%, mix the back generation with black liquor and mix black liquor, mix black liquor this moment becomes supersaturation liquid, and generation crystalline deposit, with this crystalline particle as nucleus, more crystallization is carried out on nucleus, prevent that the evaporimeter heating surface goes out to imitate crystallization in the subsequent evaporation process, thereby effectively avoid evaporating the fouling of device heating surface, to keep the cleaning of heat-transfer area; Obtain and sode ash and the mixed black liquor that mixes of saltcake, by volume (or weight) is than being divided into 3 parts, wherein 2 parts are sent to crystallization enrichment evaporator evaporation, the steam that crystallization enrichment evaporimeter uses is the saturated vapor of 0.22～0.26Mpa, the black liquor solid concentration that goes out crystallization enrichment evaporimeter is 65wt%, after the flash distillation of super concentrated black liquid flash tank, be sent to pressure concentrated black liquid groove again and store, send the alkali recovery boiler to use according to the needs of alkali recovery boiler; Wherein 1 part is to be sent to the evaporation of I single-effect evaporator after the black liquor of 53wt% mixes with going out II single-effect evaporator concentration, the order that black liquor is pressed C chamber → B chamber → A chamber is evaporated (the I single-effect evaporator is pressed A, B, the design of C three Room) in three chambers of I single-effect evaporator, the steam that the I single-effect evaporator uses is the saturated vapor of 0.15～0.20Mpa, the black liquor solid concentration that goes out the I single-effect evaporator is 62wt%, is sent in the black liquor mixing channel to store and mix with sode ash, saltcake after the flash distillation of black liquor flash tank.Under this method of operation, scale formation does not all appear in I single-effect evaporator and crystallization enrichment evaporimeter heat-transfer surface surface, and alkali recovery boiler burning solid concentration is the black liquor of 65wt%, and the black liquor of the 58wt% that burns improves production capacity more than 15%, and steam production improves 10%.
Embodiment 4:
Imitating board-like falling film evaporation six adds in the evaporation process of crystallization and evaporation, going out I single-effect evaporator solid concentration is the black liquor of 62wt%, this black liquor is delivered in the black liquor mixing channel, by the total of sending into black liquor solid in the black liquor mixing channel, add 1wt% and come from the sode ash of alkali recovery boiler collection and the saltcake of 4wt%, mix the back generation with black liquor and mix black liquor, mix black liquor this moment becomes supersaturation liquid, and generation crystalline deposit, as nucleus, more crystallization is carried out with this crystalline particle on nucleus, prevented that the evaporimeter heating surface goes out to imitate crystallization in the subsequent evaporation process, thereby effectively avoid evaporating the fouling of device heating surface, to keep the cleaning of heat-transfer area; Obtain and sode ash and the mixed black liquor that mixes of saltcake, by volume (or weight) is than being divided into 4.5 parts, wherein 3.5 parts are sent to crystallization enrichment evaporator evaporation, the steam that crystallization enrichment evaporimeter uses is the saturated vapor of 0.22～0.26Mpa, the black liquor solid concentration that goes out crystallization enrichment evaporimeter is 73wt%, this is sent to pressure concentrated black liquid groove and stores, and send the alkali recovery boiler to use according to the needs of alkali recovery boiler; Wherein 1 part with going out II to imitate concentration be to be sent to the I single-effect evaporator after the black liquor of 55wt% mixes to evaporate, the order that black liquor is pressed C chamber → A chamber is evaporated (the I single-effect evaporator is pressed A, B, the design of C three Room) in three chambers of I single-effect evaporator, this moment, the B chamber used clear water to clean, the steam that the I single-effect evaporator uses is the saturated vapor of 0.15～0.20Mpa, the black liquor solid concentration that goes out the I single-effect evaporator is 65wt%, and this black liquor is sent in the black liquor mixing channel to be stored and mix with sode ash, saltcake.Under this method of operation, scale formation does not all appear in I single-effect evaporator and crystallization enrichment evaporimeter heat-transfer surface surface, and alkali recovery boiler burning solid concentration is the black liquor of 73wt%, and the black liquor of the 62wt% that burns improves production capacity more than 6%, and steam production improves 13%.
Embodiment 5:
Imitating the long tube climbing-film evaporation five adds in the evaporation process of crystallization and evaporation, going out I single-effect evaporator solid concentration is the black liquor of 50wt%, after the flash distillation of black liquor flash tank, deliver in the black liquor mixing channel, by the total of sending into black liquor solid in the black liquor mixing channel, add 1.5wt% and come from the sode ash of alkali recovery boiler collection and the saltcake of 6.5wt%, mix the back generation with black liquor and mix black liquor, mix black liquor this moment becomes supersaturation liquid, and generation crystalline deposit, with this crystalline particle as nucleus, more crystallization is carried out on nucleus, prevent that the evaporimeter heating surface goes out to imitate crystallization in the subsequent evaporation process, thereby effectively avoid evaporating the fouling of device heating surface, to keep the cleaning of heat-transfer area; Obtain and sode ash and the mixed black liquor that mixes of saltcake, by volume (or weight) is than being divided into 3 parts, wherein 2 parts are sent to crystallization enrichment evaporator evaporation, the steam that crystallization enrichment evaporimeter uses is the saturated vapor of 0.22～0.26Mpa, the black liquor solid concentration that goes out crystallization enrichment evaporimeter is 65wt%, after the flash distillation of super concentrated black liquid flash tank, be sent to pressure concentrated black liquid groove again and store, send the alkali recovery boiler to use according to the needs of alkali recovery boiler; Wherein 1 part with going out II to imitate concentration be to be sent to the I single-effect evaporator after the black liquor of 41wt% mixes to evaporate, the steam that the I single-effect evaporator uses is the saturated vapor of 0.15～0.20Mpa, the black liquor solid concentration that goes out the I single-effect evaporator is 50wt%, is sent in the black liquor mixing channel to store and mix with sode ash, saltcake after the flash distillation of black liquor flash tank.Under this method of operation, scale formation does not all appear in I single-effect evaporator and crystallization enrichment evaporimeter heat-transfer surface surface, the black liquor solid concentration that goes out crystallization enrichment evaporimeter is 65wt%, can directly be sent to the burning of alkali recovery boiler, and five effect long tube climbing-film evaporation departures black liquor solid concentration are 50wt%, will by black liquor with just can send the burning of alkali recovery boiler after flue gas directly contacts enrichment, both relatively can improve production capacity more than 20%, steam production improves more than 30%.
The sode ash of collecting because of the alkali recovery boiler and the Main Ingredients and Appearance of saltcake are sodium sulphate, both can the trans-substitution of equivalent phase, and on the specific embodiment, both ratios without limits, make the mixing black liquor contain excessive sulfate as long as the satisfied total amount that adds reaches, become sulfate supersaturation liquid.
The present invention is not limited only to above embodiment and embodiment; for other similar black liquor vaporizing flow process; evaporation equipment; imitate or seven imitate board-like falling film evaporation and add crystallization and evaporation device, five and imitate the long tube climbing-film evaporations and add the crystallization and evaporation device as quadruple effect, five; as long as it has adopted above-mentioned know-why and thinking, also belong to protection scope of the present invention.
Claims (10)
1. a paper making pulping black liquid crystallization and evaporation method is characterized in that: comprise the following steps:
Step 1, the black liquor that will go out the I single-effect evaporator are delivered in the black liquor mixing channel, add sode ash and/or saltcake in the black liquor mixing channel, mix with black liquor to generate and mix black liquor, make in the mixing black liquor and contain excessive sulfate, become sulfate supersaturation liquid;
Step 2, the mixing black liquor that step 1 is obtained are divided into two parts, a part is sent to crystallization enrichment evaporator evaporation, remainder mixes with the black liquor that goes out the II single-effect evaporator, make in its mixed black liquor and contain excessive sulfate, become sulfate supersaturation liquid, enter successively after the mixing in three chambers of I single-effect evaporator and evaporate, the black liquor that goes out the I single-effect evaporator returns step 1;
Step 3, step 2 is sent to black liquor after the crystallization enrichment evaporator evaporation is sent to pressure black liquor groove and stores.
2. paper making pulping black liquid crystallization and evaporation method according to claim 1 is characterized in that: go out I single-effect evaporator black liquor and after the flash distillation of black liquor flash tank, be sent to again in the black liquor mixing channel, and then in the black liquor mixing channel with sode ash or/and saltcake mix.
3. paper making pulping black liquid crystallization and evaporation method according to claim 1 and 2 is characterized in that: the black liquor solid concentration that goes out the I single-effect evaporator is 58wt%～66wt%.
4. paper making pulping black liquid crystallization and evaporation method according to claim 1 is characterized in that: the black liquor after the step 3 crystallization enrichment evaporator evaporation is sent to pressure black liquor groove again and stores after the flash distillation of super concentrated black liquid flash tank.
5. paper making pulping black liquid crystallization and evaporation method according to claim 1 is characterized in that: be sent to crystallization enrichment evaporimeter with sode ash and/or saltcake mixing black liquor in the step 2 and be 2～5:1 with the ratio that goes out the volume that II single-effect evaporator black liquor mixes.
6. paper making pulping black liquid crystallization and evaporation method according to claim 1 and 2 is characterized in that: sode ash is or/and the addition of saltcake is the 4wt%～8wt% of black liquor solid amount.
7. paper making pulping black liquid crystallization and evaporation method according to claim 1 and 2 is characterized in that: sode ash is or/and the addition of saltcake is the 5wt%～7wt% of black liquor solid amount.
8. paper making pulping black liquid crystallization and evaporation method according to claim 1 is characterized in that: it is 41wt%～55wt% that step 2 goes out II effect black liquor solid concentration.
9. according to claim 1 or 8 described paper making pulping black liquid crystallization and evaporation methods, it is characterized in that: it is 48wt%～53wt% that step 2 goes out II single-effect evaporator black liquor solid concentration.
10. according to claim 2 or 4 described paper making pulping black liquid crystallization and evaporation methods, it is characterized in that: go out the steam that I single-effect evaporator black liquor produces and send the III single-effect evaporator after the flash distillation of black liquor flash tank, the black liquor after the crystallization enrichment evaporator evaporation send the II single-effect evaporator through the steam of super concentrated black liquid flash tank flash distillation generation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102051989A CN101831826B (en) | 2010-06-22 | 2010-06-22 | Paper making pulping black liquid crystallization and evaporation method |
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| CN2010102051989A CN101831826B (en) | 2010-06-22 | 2010-06-22 | Paper making pulping black liquid crystallization and evaporation method |
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| CN101831826A true CN101831826A (en) | 2010-09-15 |
| CN101831826B CN101831826B (en) | 2012-05-23 |
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| CN2010102051989A Expired - Fee Related CN101831826B (en) | 2010-06-22 | 2010-06-22 | Paper making pulping black liquid crystallization and evaporation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103318980A (en) * | 2013-07-03 | 2013-09-25 | 金东纸业（江苏）股份有限公司 | Processing device and processing method of pulping waste water |
| CN107660245A (en) * | 2015-06-01 | 2018-02-02 | 威立雅水处理技术公司 | The method for reclaiming pulping chemistry material from the ash content of the dissolving with high-carbon phosphate content |
| CN109364518A (en) * | 2018-10-26 | 2019-02-22 | 福建省青山纸业股份有限公司 | A kind of novel black liquor crystallization and evaporation process |
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|---|---|---|---|---|
| US4259082A (en) * | 1979-06-07 | 1981-03-31 | Scott Paper Company | Process for purifying sodium sulfate crystals |
| CN1017077B (en) * | 1989-09-04 | 1992-06-17 | 中国科学院环境评价部 | Acidifying process of paper black liquid with sulphur dioxide |
| US5181396A (en) * | 1988-09-28 | 1993-01-26 | A. Ahlstrom Corporation | Method of freezing and separation |
| 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 |
-
2010
- 2010-06-22 CN CN2010102051989A patent/CN101831826B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4259082A (en) * | 1979-06-07 | 1981-03-31 | Scott Paper Company | Process for purifying sodium sulfate crystals |
| US5181396A (en) * | 1988-09-28 | 1993-01-26 | A. Ahlstrom Corporation | Method of freezing and separation |
| CN1017077B (en) * | 1989-09-04 | 1992-06-17 | 中国科学院环境评价部 | Acidifying process of paper black liquid with sulphur dioxide |
| 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103318980A (en) * | 2013-07-03 | 2013-09-25 | 金东纸业（江苏）股份有限公司 | Processing device and processing method of pulping waste water |
| CN103318980B (en) * | 2013-07-03 | 2014-08-20 | 金东纸业（江苏）股份有限公司 | Processing device and processing method of pulping waste water |
| CN107660245A (en) * | 2015-06-01 | 2018-02-02 | 威立雅水处理技术公司 | The method for reclaiming pulping chemistry material from the ash content of the dissolving with high-carbon phosphate content |
| CN107660245B (en) * | 2015-06-01 | 2020-09-08 | 威立雅水处理技术公司 | Method for recovering pulping chemicals from dissolved ash having high carbonate content |
| CN109364518A (en) * | 2018-10-26 | 2019-02-22 | 福建省青山纸业股份有限公司 | A kind of novel black liquor crystallization and evaporation process |
| CN109364518B (en) * | 2018-10-26 | 2021-07-30 | 福建省青山纸业股份有限公司 | Black liquor crystallization and evaporation process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101831826B (en) | 2012-05-23 |
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