CN102277769B - Technology for heating and processing black liquor in alkali recovery - Google Patents
Technology for heating and processing black liquor in alkali recovery Download PDFInfo
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- CN102277769B CN102277769B CN2011102635960A CN201110263596A CN102277769B CN 102277769 B CN102277769 B CN 102277769B CN 2011102635960 A CN2011102635960 A CN 2011102635960A CN 201110263596 A CN201110263596 A CN 201110263596A CN 102277769 B CN102277769 B CN 102277769B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a technology for heating and processing black liquor in alkali recovery, belonging to the field of papermaking and pulping. In the technology, a tubular heater is adopted to indirectly heat the black liquor; and heat exchange is carried out in a reverse heating mode, so that the black liquor can quickly achieve temperature required by the technology, the concentration of the solid matter in the black liquor is kept, the burning heat loss of the black liquor is lowered, and the black liquor can more stably burn after entering an alkali boiler.
Description
Technical field
The present invention relates to the treatment process of waste liquid in a kind of pulping process, more particularly, the present invention relates to the black liquor heating treatment process in a kind of chemical recovery system.
Background technology
Black liquor is in sulfate process or the caustic soda legal system pulping process, and the cleaning solution of the paper pulp of washing after the boiling is black, wherein contains inorganic matter in the cooking liquor and lignin, hemicellulose and cellulosic catabolite and the organic acid etc. of stripping from plant fiber material.Inorganic matter comprise free NaOH, sodium sulphate, vulcanized sodium, sodium carbonate and with the sodium of organic matter chemical combination, silica etc.
Black liquor directly enters rivers and can pollute, and should recycle.Processing method be Xian Jiang ?the liquid evaporation and concentration, again through the burning of alkali stove, recyclable soda ash.The heat that burning generates reclaims with vapor form.Most of inorganic matter becomes molten condition in combustion process, after the dissolving green liquor (green liquor).Green liquor becomes white liquid (white liquor) through the milk of lime causticization after the clarification, can be used for preparing cooking liquor paper pulp processed.Sediment after the white liquid clarification is calcium carbonate (paper industry is called white clay).
In soda processes, sulfate pulping process, nearly 50% fibrous raw material substance dissolves is in cooking liquor, and is darker because of its color, is called black liquor.
The inorganic matter of the nearly 30-35% of black liquor, Main Ingredients and Appearance are other sodium salts of NaOH, sodium carbonate, vulcanized sodium, sodium sulphate and organic matter combination.The organic substance that 65-70% is arranged, Main Ingredients and Appearance are lignin, resin, starch and low molecular compound etc.In alkali reclaimed, black liquor was the raw material that alkali reclaims.
It is 97102030.2 that State Intellectual Property Office disclosed an application number on October 8th, 1997, name is called the patent of invention of " method of heat treating black liquor ", and a kind of method of heat-treating under temperature 150-350 ℃ the condition that black liquor from pulping process is in reactor is provided.Black liquor is sent to the vapor film of heat treatment reactor and directly contacts and black liquor is heated to the temperature of requirement with steam on the liquid level, and then, black liquor is stayed reactor internal reaction a period of time under the temperature that requires.
Above-mentioned prior art mainly adopts live (open) steam heating in the storage tank, when having heat temperature raising, the black liquor foam is many, the technological requirement temperature that temperature can't improve, simultaneously directly heating, steam condensate (SC) directly enters in the black liquor, causes black liquor solid concentration to reduce, increase the heat loss of black-liquor combustion, alkali stove combustion instability etc.
Summary of the invention
The present invention is intended to solve in the prior art alkali recovery process directly the black liquor heating, causes the black liquor foam too much, so that can't bring up to the problem of technological requirement temperature, provides a kind of black liquor heating treatment process, makes black liquor can reach fast the technological requirement temperature.
Another object of the present invention causes black liquor solid concentration to reduce for solving directly heating, increase the heat loss of black-liquor combustion, the problem of alkali stove combustion instability, the solid concentration of maintenance black liquor, reduce the heat loss of black-liquor combustion, it is more stable to make black liquor enter the after-combustion of alkali stove.
In order to realize the foregoing invention purpose, its concrete technical scheme is as follows:
Black liquor heating treatment process during a kind of alkali reclaims is characterized in that: comprise following processing step:
A, concentrated black liquid is extracted out from accumulator tank through pump;
B, the concentrated black liquid of extracting out is sent into tube still heater through pipeline, steam enters the steam chest of heater, and pipeline is heated, and black liquor passes through from pipeline, indirectly is heated by steam; Its mode of heating adopts reverse heating, namely steam flow from high temperature section to low-temperature zone ， ?the liquid flow process from low-temperature zone to the heat exchange of high temperature section counter movement;
C, black liquor are heated to and directly enter the alkali reclaimer operation that the alkali stove carries out routine after 105-120 ℃.
Concentrated black liquid described in the above-mentioned steps A is that solid concentration is not less than 50% black liquor, and temperature is 80-95 ℃.
Vapor (steam) temperature described in the above-mentioned steps B is 150-180 ℃.
Steam pressure described in the above-mentioned steps B is 0.4-0.8Mpa.
The heating surface (area) (HS of the tube still heater described in the above-mentioned steps B is controlled at 2.5-3.5m
2
Tube still heater described in the above-mentioned steps B is detachable.
Be 8-15 second the black liquor heat time heating time described in the above-mentioned steps B.
The Baume degrees of the black liquor of the process heating described in the above-mentioned steps C is 30-40 ° of B é, and solid concentration is 50-60%.
The useful technique effect that the present invention brings:
1, the direct heating steps in original technique is because hot spot relatively in the part, so firing rate is slow, reach technological requirement, and caused the heating tank front that the very large accumulator tank at night of volume need to be set and fill black liquor to be heated heat time heating time about 2 hours; And adopt technique firing rate of the present invention fast, steam flow from high temperature section to low-temperature zone ?the liquid flow process from low-temperature zone to the heat exchange of high temperature section counter movement, can reach technological parameter about 10 seconds, the accumulator tank that so just need to not install large volume before heater additional fills black liquor to be heated, has saved cost and factory building space;
2, the limited ， of direct heating steps heating-up temperature of original technique ?liquid can Dao Zhi when arriving more than 100 ℃ ?liquid acutely not rise, expand, easily Zao Cheng ?the environmental pollution of becoming estranged of hydrorrhea flowing full; And adopt indirect technique of the present invention, heating-up temperature is unrestricted, according to technological requirement, black liquor temperature can unconfined increase ， ?liquid also can, also can not overflow loss, having avoided the waste of black liquor to run off can be to environment yet;
3, in the direct heating steps of original technique, heating condensate water directly sneak into Bei Jia Re De ?in the liquid, Xing Cheng ?liquid temp increase and concentration reduces, destroy ?original quality of liquid; And adopt indirect technique of the present invention, the condensed water of heat exchange to advance in the ?liquid without chance, having stopped condensed water advances in the ?liquid to mix with black liquor black liquid consistency is reduced, and has guaranteed the quality of black liquor, is conducive to the chemical recovery system technique in downstream;
4, in the direct heating steps of original technique, moisture increases in the ?liquid, and solid concentration reduces, and ?liquid has increased heat loss when entering the burning of alkali stove, cause that furnace temperature is low, combustion instability, steam less, the sodium sulphate drawback such as original error also in the stove; Adopt indirect technique of the present invention, solid content can not reduce, just can guarantee the alkali stove flameholding, generate heat, steam and reduction effect.
5, the direct heating steps in original technique is that concentrated black liquid is first sent into heating tank by a liquid-feeding pump and since firing rate caused slowly black liquor circulate Man ， ? also need a liquid-feeding pump that black liquor is sent to the alkali stove after the liquid heating to burn; And adopt indirect technique of the present invention, and firing rate is fast, and black liquor need not to stop, and only need to install a liquid-feeding pump additional at accumulator tank just can guarantee that black liquor input heater heats laggard alkali stove burning, has saved cost, has simplified processing step.
6, stopped direct-fired heat loss; Because of Zhi connect Jia Re De ?liquid measure large, and enter stove Ran Shao De ?liquid measure little, heating Hou De ?liquid can cool off again heating, so thermal losses is large.Indirect is the needs according to the stove internal combustion, burn Duo Shao ?liquid, namely heat Duo Shao ?liquid, in time heating in time enters the stove burning, does not have heat loss.
The specific embodiment
Embodiment 1
A, concentrated black liquid is extracted out from accumulator tank through pump;
B, the concentrated black liquid of extracting out is sent into tube still heater through pipeline, steam enters the steam chest of heater, and pipeline is heated, and black liquor passes through from pipeline, indirectly is heated by steam; Its mode of heating adopts reverse heating, namely steam flow from high temperature section to low-temperature zone ， ?the liquid flow process from low-temperature zone to the heat exchange of high temperature section counter movement;
Directly enter the alkali stove after C, black liquor are heated to 105 ℃ and carry out the alkali reclaimer operation.
Embodiment 2
A, concentrated black liquid is extracted out from accumulator tank through pump;
B, the concentrated black liquid of extracting out is sent into tube still heater through pipeline, steam enters the steam chest of heater, and pipeline is heated, and black liquor passes through from pipeline, indirectly is heated by steam; Its mode of heating adopts reverse heating, namely steam flow from high temperature section to low-temperature zone ， ?the liquid flow process from low-temperature zone to the heat exchange of high temperature section counter movement;
Directly enter the alkali stove after C, black liquor are heated to 120 ℃ and carry out the alkali reclaimer operation.
Embodiment 3
A, concentrated black liquid is extracted out from accumulator tank through pump;
B, the concentrated black liquid of extracting out is sent into tube still heater through pipeline, steam enters the steam chest of heater, and pipeline is heated, and black liquor passes through from pipeline, indirectly is heated by steam; Its mode of heating adopts reverse heating, namely steam flow from high temperature section to low-temperature zone ， ?the liquid flow process from low-temperature zone to the heat exchange of high temperature section counter movement;
Directly enter the alkali stove after C, black liquor are heated to 113 ℃ and carry out the alkali reclaimer operation.
Embodiment 4
A, concentrated black liquid is extracted out from accumulator tank through pump;
B, the concentrated black liquid of extracting out is sent into tube still heater through pipeline, steam enters the steam chest of heater, and pipeline is heated, and black liquor passes through from pipeline, indirectly is heated by steam; Its mode of heating adopts reverse heating, namely steam flow from high temperature section to low-temperature zone ， ?the liquid flow process from low-temperature zone to the heat exchange of high temperature section counter movement;
Directly enter the alkali stove after C, black liquor are heated to 108 ℃ and carry out the alkali reclaimer operation.
Embodiment 5
On the basis of embodiment 1-4, following preferred version is arranged further:
Concentrated black liquid described in the steps A is that solid concentration is 50% black liquor, and temperature is 80 ℃.
Vapor (steam) temperature described in the step B is 150 ℃.
Steam pressure described in the step B is 0.4Mpa.
The heating surface (area) (HS of the tube still heater described in the step B is controlled at 2.5m
2
Tube still heater described in the step B is detachable.
Be 8 seconds the black liquor heat time heating time described in the step B.
Embodiment 6
On the basis of embodiment 1-4, following preferred version is arranged further:
Concentrated black liquid described in the steps A is that solid concentration is 60% black liquor, and temperature is 95 ℃.
Vapor (steam) temperature described in the step B is 180 ℃.
Steam pressure described in the step B is 0.8Mpa.
The heating surface (area) (HS of the tube still heater described in the step B is controlled at 3.5m
2
Tube still heater described in the step B is detachable.
Be 5 seconds the black liquor heat time heating time described in the step B.
Embodiment 7
On the basis of embodiment 1-4, following preferred version is arranged further:
Concentrated black liquid described in the steps A is that solid concentration is 55% black liquor, and temperature is 87.5 ℃.
Vapor (steam) temperature described in the step B is 165 ℃.
Steam pressure described in the step B is 0.6Mpa.
The heating surface (area) (HS of the tube still heater described in the step B is controlled at 3m
2
Tube still heater described in the step B is detachable.
Be 12 seconds the black liquor heat time heating time described in the step B.
Embodiment 8
On the basis of embodiment 1-4, following preferred version is arranged further:
Concentrated black liquid described in the steps A is that solid concentration is 58% black liquor, and temperature is 93 ℃.
Vapor (steam) temperature described in the step B is 155 ℃.
Steam pressure described in the step B is 0.7Mpa.
The heating surface (area) (HS of the tube still heater described in the step B is controlled at 2.8m
2
Tube still heater described in the step B is detachable.
Be 10 seconds the black liquor heat time heating time described in the step B.
Embodiment 9
Baume degrees at the black liquor that passes through heating described in the step C is 30-40 ° of B é, and solid concentration is 50-60%.
It obtains enters the advantage that alkali furnace black liquid data have embodied technique of the present invention, sees the following form:
The Ru Lu that existing technique and technique of the present invention obtain ?liquid condition comparison sheet: (process front black liquor and be 85 ℃, 34 ° of B é of Baume degrees, solid content 53%.）
| Heat form | Temperature after heating | Baume degrees changes | Solid content | Heat time heating time |
| Directly (before changing) | 105 ℃ (the highest) | 32 ° of B é (reduction) | 50%(reduces) | More than 2 hours |
| Indirectly (after changing) | 120℃ | 34 ° of B é (constant) | 53%(is constant) | About 10 seconds |
Embodiment 10
Hot form pros and cons comparison sheet:
| Heat form | Jia Re ?liquid measure | Jia Re ?liquid enter the stove amount | Heat waste relatively | Remarks |
| Directly heating | Greatly | A part | Greatly | ? |
| Indirect | Little | All | Nothing | ? |
Embodiment 11
(1) saved a large amount of equipment investments and throughout the year active consuming cost:
A, ?the one-time investment of liquid heating tank and liquid-feeding pump system reach 100,000 yuan.
The active consumption of B, liquid-feeding pump---electricity, cost of equipment maintenance: 200,000 yuan/year.(20KW * 24 hour * 30 days * December * 1 yuan/degree electricity=172800 yuan; Equipment spare unit spare, labour cost etc.）
(2) guaranteed the stable of ?liquid solid content, stopped heating condensate water Jin Ru ?in the liquid, keep flameholding, promote the raising of boiler hot exchange efficiency, voluminous steam create beneficial result reaches 84.6 ten thousand yuan (1 ton of steam/h * 24 hour * 30 days * December * 100 yuan/ton vapour=864000 yuan).
(3) ?the raising of liquid quality, guarantee ?liquid enter stable and furnace temperature stable of stove burning, effectively promoted the percent reduction of sodium sulphate to improve, reach more than 10% more than 20 ton in month volume increase akali sulphide.(20 tons * 3600 yuan/tons * December=864000 yuan).
Year of the present invention 80,000 yuan of wound economic benefits 192. (refer to current production status, if production scale enlarges, benefit can larger improve.）。
Claims (5)
1. the black liquor heating treatment process during an alkali reclaims is characterized in that: comprise following processing step:
A, concentrated black liquid is extracted out from accumulator tank through pump; Described concentrated black liquid is that solid concentration is not less than 50% black liquor, and temperature is 80-95 ℃;
B, the concentrated black liquid of extracting out is sent into tube still heater through pipeline, steam enters the steam chest of heater, and pipeline is heated, and black liquor passes through from pipeline, indirectly is heated by steam; Its mode of heating adopts reverse heating, and namely steam flow is from the high temperature section to the low-temperature zone, and the black liquor flow process is from low-temperature zone to the heat exchange of high temperature section counter movement; Described black liquor heat time heating time is 8-15 second;
C, black liquor are heated to and directly enter the alkali reclaimer operation that the alkali stove carries out routine after 105-120 ℃; The Baume degrees of the black liquor of described process heating is 30-40 ° of B é, and solid concentration is 50-60%.
2. the black liquor heating treatment process during a kind of alkali according to claim 1 reclaims is characterized in that: be 150-180 ℃ in the vapor (steam) temperature described in the step B.
3. the black liquor heating treatment process during a kind of alkali according to claim 1 reclaims is characterized in that: be 0.4-0.8MPa at the steam pressure described in the step B.
4. the black liquor heating treatment process during a kind of alkali according to claim 1 reclaims, it is characterized in that: the heating surface (area) (HS at the tube still heater described in the step B is controlled at 2.5-3.5m
2
5. the black liquor heating treatment process during a kind of alkali according to claim 1 reclaims is characterized in that: be detachable at the tube still heater described in the step B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102635960A CN102277769B (en) | 2011-09-07 | 2011-09-07 | Technology for heating and processing black liquor in alkali recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102635960A CN102277769B (en) | 2011-09-07 | 2011-09-07 | Technology for heating and processing black liquor in alkali recovery |
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| CN102277769A CN102277769A (en) | 2011-12-14 |
| CN102277769B true CN102277769B (en) | 2013-03-06 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN192893B (en) * | 1996-01-30 | 2004-05-29 | Andritz Oy | |
| SE517739E (en) * | 2000-11-22 | 2008-11-21 | Metso Power Ab | Process in the manufacture of liquids, for example, black liquor from cellulose boiling, containing solids and solutes |
| SE529386C2 (en) * | 2006-11-07 | 2007-07-24 | Metso Power Ab | Evaporating method for hot black liquor obtained from digestion process during production of cellulose pulp, involves cooling hot black liquor by heat exchange with black liquor partially evaporated in evaporation stage in evaporation line |
| CN101487197B (en) * | 2008-01-16 | 2010-11-10 | 山东泉林纸业有限责任公司 | Straw pulp black liquor concentration process |
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