CN101526221A - Process for incinerating cotton linter black liquor and recycling alkaline by utilizing heat conduction oil boiler - Google Patents
Process for incinerating cotton linter black liquor and recycling alkaline by utilizing heat conduction oil boiler Download PDFInfo
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- CN101526221A CN101526221A CN200910020636A CN200910020636A CN101526221A CN 101526221 A CN101526221 A CN 101526221A CN 200910020636 A CN200910020636 A CN 200910020636A CN 200910020636 A CN200910020636 A CN 200910020636A CN 101526221 A CN101526221 A CN 101526221A
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- black liquor
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- cotton linter
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a process for incinerating cotton linter black liquor and recycling alkaline by utilizing a heat conduction oil boiler, which belongs to the technical field of pulping waste water treatment. The process comprises the following steps: (a) cotton linter pumping black liquor with the mass concentration of about 6 percent from an extracting workshop section is heated, evaporated and thickened by a multiple-effect evaporator which takes cyclic heat conduction oil as a heat source till the mass concentration of the black liquor reaches 40-50 percent; (b) the thickened black liquor is sprayed into the heat conduction oil boiler for combustion, the heat energy is recovered by the heat conduction oil in a heating surface, and sodium carbonate generated by the combination of sodium hydroxide and carbon dioxide in the waste water is discharged out of the boiler; (c) the generated sodium carbonate is reduced into alkaline by adopting a hydrated lime causticizing method, and the alkaline resources are recycled for productive cycle and utilization. The process saves the construction funds by one third, saves energy by 30 percent and reduces the operation cost by 25 percent compared with the general alkaline recovery process, has high heat energy utilization ratio and zero CODcr index of discharged waste water and can thoroughly and effectively solve the pollution of cotton linter black liquor.
Description
Technical field
The black liquor that the present invention relates to a kind of pulp-making of cotton linter industry handle to reclaim the technology of alkali, particularly utilizes the heat conducting oil boiler incinerating cotton linter black liquor and reclaims the technology of alkali, belongs to the pulp-making waste-water processing technology field.
Background technology
The black liquor treatment technology that present domestic alkaline process pulp-making of cotton linter enterprise produces just adopts materialization, biochemical process to handle waste water, and this method is 3% (to be equivalent to COD for concentration of treatment
CrBeing 30000mg/l) following black liquor waste can also be up to standard, and reach more than 6% from the original waste water concentration of slurrying, only depend on these methods can not accomplish qualified discharge, and present domestic even unique in the world method of administering these high concentrated organic wastewaters (concentration is more than 3%) is exactly " alkali recovery ", this technology is only used the paper-making pulping industry at present, and the pulp-making of cotton linter industry does not substantially also adopt Silvola recovery.
Alkali recovery process comprises extraction, evaporation, burning, four workshop sections of causticization.Alkali reclaims and is applied in just stable operation in recent years on the domestic pulping and paper-making, and basic principle is the burning causticizing process; Be that a kind of organic matter that incinerates in the black liquor waste is thoroughly eliminated the pollution of waste water to the river, the COD index of discharge of wastewater is zero.The alkali recovery is with the waste liquid that discharges after the soda pulping process (original concentration of paper-making pulping black liquor discharging is about 10%), after concentrating, act as a fuel, send into black liquor incinerator internal combustion, behind the black-liquor combustion, organic matter is thoroughly burnt and is produced heat energy and recycled, inorganic matter becomes sodium carbonate discharges from furnace bottom with the fused mass form, is reduced into alkali through causticizing process and gets back to the production cycle utilization.At present, the alkali recovery process of paper industry all adopts black liquor uperize boiler, and the vapor portion of generation is personal, and part is entered evaporate station and added hot black liquor, and black liquor is concentrated to about 50% by about 10% and advances the incinerator burning.
Slurrying enterprise uses black liquor uperize alkali stove, and have following some deficiency: the steam that (1) black liquor uperize boiler produces can not reclaim fully, even reclaims, and causes the significant wastage of the energy; (2) whole system heat energy utilization rate is low; (3) manufacturing cost of steam boiler and operating cost are all high, need supporting water treatment facilities, deaeration plant; (4) black liquor uperize boiler is undue pursues on a large scale, is not suitable for the medium-scale national conditions in the majority of China existing slurrying enterprise, and the scale that also is not suitable for is all in medium cotton linter industry on the lower side.
Summary of the invention
The objective of the invention is provides a kind of technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali at the deficiencies in the prior art, this kind energy saving technology, and heat energy utilization rate height, operating cost reduce, can thoroughly solve black liquor pollution effectively.
The technical scheme that the present invention takes is:
Utilize the heat conducting oil boiler incinerating cotton linter black liquor and reclaim the technology of alkali, it is characterized in that, may further comprise the steps: a) will be from the pulp-making of cotton linter black liquor of the mass concentration about 6% of extracting workshop section through making multi-effect evaporator heating, evaporation, the enrichment of thermal source with circulating heat conduction oil, reach 40%～50% to the black liquor mass concentration; B) with the black liquor spirt heat conducting oil boiler internal combustion behind the enrichment, utilize the conduction oil in the heating surface to reclaim heat energy, the NaOH in the waste water combines generation sodium carbonate and discharges out of the furnace with carbon dioxide; C) sodium carbonate that generates is reduced into alkali with the white lime causticizing process, the alkali resource reclaims for the production cycle utilization.
The described technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali, circulating heat conduction described in step a) oil endless form is: outer for entering multi-effect evaporator by oil circulating pump when the conduction oil heat absorption is elevated to 200～280 ℃ in the heat conducting oil boiler, and when entering, the interior conduction oil temperature ratio of multi-effect evaporator sent back in the heat conducting oil boiler during 20～30 ℃ of temperature reductions.
The described technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali, the burning described in the step b) are to adopt the bed course burning or adopt the fluid bed mode to burn at burner hearth bottom.
Described bed course burning, the Na of generation
2CO
3Discharge out of the furnace the dissolving of air-cooled back with the fused mass form.
Described fluid bed mode is burnt, the Na of generation
2CO
3Discharge out of the furnace with solid form.
The technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali of the present invention has been compared following advantage with existing alkali recovery process:
1, thoroughly incinerates the pulp-making of cotton linter black liquor, the black liquor waste COD that handled
CrIndex is zero, helps CO
2Reduction of discharging, help environmental protection.The waste water that burns efficiently utilizes as a kind of living beings renewable and clean energy resource, has saved coal, petroleum resources more.
2, change the steam source in the multi-effect evaporator into conduction oil, adopt heat conducting oil boiler to substitute black liquor uperize boiler, just change water, steam heat transfer medium into conduction oil, reclaimed the heat energy that the burning back produces efficiently, make full use of the conduction oil efficient circulation, can energy-conservation 30%.
3, water vapour will reach 200 ℃ then needs higher pressure, and boiler requires high pressure resistant when making, increased manufacturing cost.Heat conducting oil boiler is more much lower than the manufacturing cost of steam boiler, and does not need water treatment facilities and deaeration plant; Conduction oil can be recycling, almost not loss, the serviceability temperature scope is liquid state for-30～400 ℃, in this temperature range, can use arbitrarily and pressure lower.Therefore construction fund reclaims than conventional alkali and saves 1/3, and operating cost reduces by 25%.
The technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali of the present invention can be applied to burns other soda pulping process waste water (as: paper-making pulping industry, forage protein industry); Also can be applied to the treatment of Organic Wastewater that is not soda pulping process, burn high concentrated organic wastewater (as: yellow ginger waste water), just not have the alkali resource, not reclaim alkali.
Description of drawings
Fig. 1 is the process flow diagram that utilizes the heat conducting oil boiler incinerating cotton linter black liquor and reclaim alkali.
Among the figure: conduction oil is sent heat conducting oil boiler in the former multi-effect evaporator of 1-; Enter multi-effect evaporator by oil circulating pump after the conduction oil heat absorption heats up in the 2-heat conducting oil boiler.
The specific embodiment
Fig. 1 has provided process flow diagram of the present invention.Further specify below in conjunction with embodiment.
Enter multi-effect evaporator from the rare black liquor that extracts workshop section, multi-effect evaporator uses circulating heat conduction oil to make thermal source, rare black liquor is by multi-effect evaporator heating, evaporation, enrichment, when the black liquor mass concentration reaches 40%～50%, with the black liquor spirt heat conducting oil boiler internal combustion behind the enrichment, burning is to adopt the bed course burning at burner hearth bottom, and the organic matter in the black liquor is thoroughly burnt, and the inorganic matter in the black liquor becomes Na
2CO
3, Na
2CO
3Discharge out of the furnace the dissolving of air-cooled back, Na with the fused mass form
2CO
3Be reduced into alkali with causticizing process.The heat energy that produces in the heat conducting oil boiler is absorbed by the conduction oil in the heating surface simultaneously, and the conduction oil temperature supplies outward when being elevated to 200 ℃～280 ℃; High temperature heat conductive oil enters one in the multi-effect evaporator by oil circulating pump and imitates the indirect black liquor, and as the external thermal source of multi-effect evaporator, the thermal source of remaining multi-effect evaporator is the indirect steam that a last effect produces; During 20～30 ℃ of conduction oil coolings, sent back to heat temperature raising in the heat conducting oil boiler again, conduction oil is mobile in pipe in liquid mode all the time, recycles.
Enter multi-effect evaporator from the rare black liquor that extracts workshop section, multi-effect evaporator uses circulating heat conduction oil to make thermal source, rare black liquor is by multi-effect evaporator heating, evaporation, enrichment, when the black liquor mass concentration reaches 40%～50%, with the black liquor spirt heat conducting oil boiler internal combustion behind the enrichment, burning is to adopt the fluid bed mode to burn at burner hearth bottom, and the organic matter in the black liquor is thoroughly burnt, and the inorganic matter in the black liquor becomes Na
2CO
3, Na
2CO
3Be reduced into alkali with causticizing process.The heat energy that produces in the heat conducting oil boiler is absorbed by the conduction oil in the heating surface simultaneously, and the conduction oil temperature supplies outward when being elevated to 200 ℃～280 ℃; High temperature heat conductive oil enters one in the multi-effect evaporator by oil circulating pump and imitates the indirect black liquor, and as the external thermal source of multi-effect evaporator, the thermal source of remaining multi-effect evaporator is the indirect steam that a last effect produces; During 20～30 ℃ of conduction oil coolings, sent back to heat temperature raising in the heat conducting oil boiler again, conduction oil is mobile in pipe in liquid mode all the time, recycles.
Claims (3)
1, utilizes heat conducting oil boiler incinerating cotton linter black liquor and reclaim the technology of alkali, it is characterized in that, may further comprise the steps: a) will be from the pulp-making of cotton linter black liquor of the mass concentration about 6% of extracting workshop section through making multi-effect evaporator heating, evaporation, the enrichment of thermal source with circulating heat conduction oil, reach 40%～50% to the black liquor mass concentration; B) with the black liquor spirt heat conducting oil boiler internal combustion behind the enrichment, utilize the conduction oil in the heating surface to reclaim heat energy, the NaOH in the waste water combines generation sodium carbonate and discharges out of the furnace with carbon dioxide; C) sodium carbonate that generates is reduced into alkali with the white lime causticizing process, the alkali resource reclaims for the production cycle utilization.
2, according to the described technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali of claim 1, it is characterized in that, circulating heat conduction described in step a) oil endless form is: outer for entering multi-effect evaporator by oil circulating pump when the conduction oil heat absorption is elevated to 200～280 ℃ in the heat conducting oil boiler, and when entering, the interior conduction oil temperature ratio of multi-effect evaporator sent back in the heat conducting oil boiler during 20～30 ℃ of temperature reductions.
According to the described technology of utilizing the heat conducting oil boiler incinerating cotton linter black liquor and reclaiming alkali of claim 1, it is characterized in that 3, the burning described in the step b) is to adopt the bed course burning or adopt the fluid bed mode to burn at burner hearth bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910020636A CN101526221A (en) | 2009-04-15 | 2009-04-15 | Process for incinerating cotton linter black liquor and recycling alkaline by utilizing heat conduction oil boiler |
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|---|---|---|---|
| CN200910020636A CN101526221A (en) | 2009-04-15 | 2009-04-15 | Process for incinerating cotton linter black liquor and recycling alkaline by utilizing heat conduction oil boiler |
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| CN101526221A true CN101526221A (en) | 2009-09-09 |
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| CN200910020636A Pending CN101526221A (en) | 2009-04-15 | 2009-04-15 | Process for incinerating cotton linter black liquor and recycling alkaline by utilizing heat conduction oil boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113121054A (en) * | 2020-01-15 | 2021-07-16 | 王树岩 | Semi-coke wastewater treatment method |
| CN117585738A (en) * | 2023-12-05 | 2024-02-23 | 江苏赛科化学有限公司 | Alkali recovery equipment is used in processing of fatty secondary alcohol polyoxyethylene ether |
-
2009
- 2009-04-15 CN CN200910020636A patent/CN101526221A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113121054A (en) * | 2020-01-15 | 2021-07-16 | 王树岩 | Semi-coke wastewater treatment method |
| CN117585738A (en) * | 2023-12-05 | 2024-02-23 | 江苏赛科化学有限公司 | Alkali recovery equipment is used in processing of fatty secondary alcohol polyoxyethylene ether |
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Application publication date: 20090909 |