CN105586800A - Wheat straw pulp black liquor alkali recovery method - Google Patents
Wheat straw pulp black liquor alkali recovery method Download PDFInfo
- Publication number
- CN105586800A CN105586800A CN201510965194.3A CN201510965194A CN105586800A CN 105586800 A CN105586800 A CN 105586800A CN 201510965194 A CN201510965194 A CN 201510965194A CN 105586800 A CN105586800 A CN 105586800A
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- Prior art keywords
- liquor
- evaporation
- concentration
- black
- black liquor
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/10—Concentrating spent liquor by evaporation
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/12—Combustion of pulp liquors
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Abstract
The invention discloses a wheat straw pulp black liquor alkali recovery method. The method includes the following steps that firstly, black liquor is evaporated and concentrated, and the concentration of the concentrated black liquor is 40-44% after evaporation; secondly, the concentrated black liquor obtained after evaporation is further evaporated and concentrated through tertiary air by means of a disk evaporator and then enters an alkali furnace to be pyrolysed and combusted, and finally green liquor is prepared in a dissolving tank; thirdly, the green liquor is processed in a causticizing department, the green liquor obtained in the second step and an excessive amount of ash are placed in a causticizing devuce, causticizing temperature is higher than 95 DEG C, and white liquor is obtained after filtration. According to the method, the technological process is simple, investment is small, and lignin is recycled while organic matter dyeing loads are reduced, wherein the concentration of the green liquor is 110-120 g/L, the amount of the excessive amount of ash is 3-5%, the causticizing degree is larger than 85%, the amount of white mud residual alkali is smaller than 2%, the dryness degree of white mud is larger than 50%, and the concentration of the white liquor is larger than 80g/L.
Description
Technical field
The present invention relates to paper-making black liquor alkali and reclaim field, particularly a kind of wheat straw black liquor alkali reclaiming method.
Background technology
People were once being perplexed in the environmental pollution that paper-making industry is brought for a long time. In paper waste, black liquor is main pollution sources. Black liquid is directly discharged in ocean, river, can cause local waters eutrophication, destroys original ecological balance. It therefore and back the bad reputation of contaminated environment. So-called black liquid, exactly being used in plant after the cellulose of papermaking extracts and separate, remaining alkaline black liquor. Black liquid is mainly made up of lignin and two kinds of compositions of hemicellulose. Seemingly, they support the cell membrane of plant together for these two kinds of compositions and cellulosic function class. But lignin and hemicellulose but can not show a candle to the such length of cellulose cell and have toughness, thereby are considered to for a long time papermaking waste material. There is certain deficiency in the recovery method of existing black liquid: project investment, operating cost are high, and the pulp mill producing per year more than slurry 1.7 ten thousand t can realize meagre profit operation; Wheat straw black liquor caloric value is low, viscosity is large, silicon content is high, makes that alkali cost recovery is high, alkali recovery is low, operation easier is large, and the technical process such as causticization, burning still need to improve, otherwise cannot normally move.
Summary of the invention
The present invention, in order to overcome the deficiency of above-mentioned technical problem, provides a kind of wheat straw black liquor alkali reclaiming method, can solve the problems of the technologies described above completely.
The technical scheme solving the problems of the technologies described above is as follows:
A kind of wheat straw black liquor alkali reclaiming method, comprises the following steps:
1) black liquor vaporizing concentration section, adopts the full plate evaporimeter of five effects to carry out evaporation and concentration to black liquor, and evaporation intensity is 10～11kg water/m2H, concentrated black liquid concentration 40%～44% after evaporation;
2) black-liquor combustion workshop section, by above-mentioned steps 1) concentrated black liquid adopts the further evaporation and concentration of tertiary air through cascade evaporator again after the evaporation that obtains, then enter alkali stove cracking burning, finally make green liquor to dissolving tank, alkali stove fire box temperature is 500～600 DEG C, furnace pressure 0～20MPa, wherein first and second wind-warm syndrome is 280～290 DEG C, primary air pressure 600～800Pa, secondary wind pressure 800～1000Pa, tertiary air is pressed 1000～1500Pa;
3) green liquor causticizing workshop section, by above-mentioned steps 2) green liquor and the excessive ash that obtain be placed in causticizer, and 95 DEG C of causticization temperature >, obtain white liquid after filtration.
Step 1) in evaporator evaporation area be 6200m2。
Technical process of the present invention is simple, invests littlely, cuts down organic matter and reclaims lignin when dying load. Wherein green liquor concentration is 110～120g/L, and excessive grey 3%～5%, carsticity is greater than 85%. The residual alkali < 2% of white clay, white clay mass dryness fraction > 50%, white liquid concentration > 80g/L. The high load capacity that the present invention can reduce black liquor greatly pollutes, and BOD can reduce 80%～85%, can reclaim in addition heat energy chemicals and reduce costs increase economic benefit. Organic matter in black liquor produces steam for our factory through burning, does not have market sale problem; Can reduce the pollutional load of full factory 80% left and right; Recyclable more than 50% caustic soda is pollution control technology more thoroughly.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further detailed explanation.
Embodiment 1:
A kind of wheat straw black liquor alkali reclaiming method, comprises the following steps:
1) black liquor vaporizing concentration section, adopts the full plate evaporimeter of five effects to carry out evaporation and concentration to black liquor, and evaporation intensity is 10kg water/m2H, concentrated black liquid concentration 40%% after evaporation; Evaporator evaporation area is 6200m2。
2) black-liquor combustion workshop section, by above-mentioned steps 1) concentrated black liquid adopts the further evaporation and concentration of tertiary air through cascade evaporator again after the evaporation that obtains, then enter alkali stove cracking burning, finally make green liquor to dissolving tank, alkali stove fire box temperature is 500 DEG C, furnace pressure 0MPa, wherein first and second wind-warm syndrome is 280 DEG C, primary air pressure 600Pa, secondary wind pressure 800Pa, tertiary air is pressed 1000Pa;
3) green liquor causticizing workshop section, by above-mentioned steps 2) green liquor and the excessive ash that obtain be placed in causticizer, and 95 DEG C of causticization temperature >, obtain white liquid after filtration.
Embodiment 2:
A kind of wheat straw black liquor alkali reclaiming method, comprises the following steps:
1) black liquor vaporizing concentration section, adopts the full plate evaporimeter of five effects to carry out evaporation and concentration to black liquor, and evaporation intensity is 11kg water/m2H, concentrated black liquid concentration 44% after evaporation; Evaporator evaporation area is 6200m2。
2) black-liquor combustion workshop section, by above-mentioned steps 1) concentrated black liquid adopts the further evaporation and concentration of tertiary air through cascade evaporator again after the evaporation that obtains, then enter alkali stove cracking burning, finally make green liquor to dissolving tank, alkali stove fire box temperature is 600 DEG C, furnace pressure 20MPa, wherein first and second wind-warm syndrome is 290 DEG C, primary air pressure 800Pa, secondary wind pressure 1000Pa, tertiary air is pressed 1500Pa;
3) green liquor causticizing workshop section, by above-mentioned steps 2) green liquor and the excessive ash that obtain be placed in causticizer, and 95 DEG C of causticization temperature >, obtain white liquid after filtration.
Embodiment 3:
A kind of wheat straw black liquor alkali reclaiming method, comprises the following steps:
1) black liquor vaporizing concentration section, adopts the full plate evaporimeter of five effects to carry out evaporation and concentration to black liquor, and evaporation intensity is 10.5kg water/m2H, concentrated black liquid concentration 40%～44% after evaporation; Evaporator evaporation area is 6200m2。
2) black-liquor combustion workshop section, by above-mentioned steps 1) concentrated black liquid adopts the further evaporation and concentration of tertiary air through cascade evaporator again after the evaporation that obtains, then enter alkali stove cracking burning, finally make green liquor to dissolving tank, alkali stove fire box temperature is 550 DEG C, furnace pressure 10MPa, wherein first and second wind-warm syndrome is 285 DEG C, primary air pressure 700Pa, secondary wind pressure 900Pa, tertiary air is pressed 1200Pa;
3) green liquor causticizing workshop section, by above-mentioned steps 2) green liquor and the excessive ash that obtain be placed in causticizer, and 95 DEG C of causticization temperature >, obtain white liquid after filtration.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and any simple modification, the equivalent variations in every foundation technical spirit of the present invention, above embodiment done, within all falling into protection scope of the present invention.
Claims (2)
1. a wheat straw black liquor alkali reclaiming method, is characterized in that, comprises the following steps:
1) black liquor vaporizing concentration section, adopts the full plate evaporimeter of five effects to carry out evaporation and concentration to black liquor, and evaporation is strongDegree is 10～11kg water/m2H, concentrated black liquid concentration 40%～44% after evaporation;
2) black-liquor combustion workshop section, by above-mentioned steps 1) concentrated black liquid is adopted through cascade evaporator again after the evaporation that obtainsBy the further evaporation and concentration of tertiary air, then enter alkali stove cracking burning, finally make green liquor to dissolving tank,Alkali stove fire box temperature is 500～600 DEG C, furnace pressure 0～20MPa, wherein first and second wind-warm syndrome be 280～290 DEG C, primary air pressure 600～800Pa, secondary wind pressure 800～1000Pa, tertiary air is pressed 1000～1500Pa;
3) green liquor causticizing workshop section, by above-mentioned steps 2) green liquor and the excessive ash that obtain be placed in causticizer, severeChange 95 DEG C of temperature >, obtain after filtration white liquid.
2. a kind of wheat straw black liquor alkali reclaiming method according to claim 1, is characterized in that step1) the evaporator evaporation area in is 6200m2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510965194.3A CN105586800A (en) | 2015-12-21 | 2015-12-21 | Wheat straw pulp black liquor alkali recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510965194.3A CN105586800A (en) | 2015-12-21 | 2015-12-21 | Wheat straw pulp black liquor alkali recovery method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105586800A true CN105586800A (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510965194.3A Pending CN105586800A (en) | 2015-12-21 | 2015-12-21 | Wheat straw pulp black liquor alkali recovery method |
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| CN (1) | CN105586800A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111017959A (en) * | 2019-11-06 | 2020-04-17 | 福建省青山纸业股份有限公司 | Production method for improving production capacity of alkali furnace |
| CN112301781A (en) * | 2020-10-14 | 2021-02-02 | 福建省青山纸业股份有限公司 | Method for performing mixed combustion by adding coal water slurry into concentrated black liquor in alkali recovery furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5284550A (en) * | 1992-06-18 | 1994-02-08 | Combustion Engineering, Inc. | Black liquier gasification process operating at low pressures using a circulating fluidized bed |
| CN101172731A (en) * | 2007-10-29 | 2008-05-07 | 山东泉林纸业有限责任公司 | Alkali digester and sulammonium process mixed straw pulping black liquor, alkali digester and sulammonium process mixed compression straw pulping black liquor, and preparation method thereof |
| CN101487197A (en) * | 2008-01-16 | 2009-07-22 | 山东泉林纸业有限责任公司 | Straw pulp black liquor concentration process |
| CN101775751A (en) * | 2010-01-22 | 2010-07-14 | 中国轻工业南宁设计工程有限公司 | Alkali recovery method by combusting bagasse black liquor |
-
2015
- 2015-12-21 CN CN201510965194.3A patent/CN105586800A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5284550A (en) * | 1992-06-18 | 1994-02-08 | Combustion Engineering, Inc. | Black liquier gasification process operating at low pressures using a circulating fluidized bed |
| CN101172731A (en) * | 2007-10-29 | 2008-05-07 | 山东泉林纸业有限责任公司 | Alkali digester and sulammonium process mixed straw pulping black liquor, alkali digester and sulammonium process mixed compression straw pulping black liquor, and preparation method thereof |
| CN101487197A (en) * | 2008-01-16 | 2009-07-22 | 山东泉林纸业有限责任公司 | Straw pulp black liquor concentration process |
| CN101775751A (en) * | 2010-01-22 | 2010-07-14 | 中国轻工业南宁设计工程有限公司 | Alkali recovery method by combusting bagasse black liquor |
Non-Patent Citations (1)
| Title |
|---|
| 柳荣展，石宝龙: "《轻化工水污染控制》", 30 September 2008 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111017959A (en) * | 2019-11-06 | 2020-04-17 | 福建省青山纸业股份有限公司 | Production method for improving production capacity of alkali furnace |
| CN112301781A (en) * | 2020-10-14 | 2021-02-02 | 福建省青山纸业股份有限公司 | Method for performing mixed combustion by adding coal water slurry into concentrated black liquor in alkali recovery furnace |
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Application publication date: 20160518 |
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