CN101721834B - Treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp - Google Patents
Treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp Download PDFInfo
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- CN101721834B CN101721834B CN2009102634763A CN200910263476A CN101721834B CN 101721834 B CN101721834 B CN 101721834B CN 2009102634763 A CN2009102634763 A CN 2009102634763A CN 200910263476 A CN200910263476 A CN 200910263476A CN 101721834 B CN101721834 B CN 101721834B
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Abstract
The invention discloses a treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp, which comprises the following technological steps: carrying out prehydrolysis for exhausting gas; cooling the gas exhausted by prehydrolysis to form incondensable gas; washing the incondensable gas with alkaline liquor and absorbing; and degrading the gas washed with the alkaline liquor at high temperature. The method of the invention can be used for treating the waste gas generated by prehydrolysis of the bamboo dissolving pulp by the prehydrolytic sulfate process to achieve the aim of emission with no pollutants, and can recycle the heat energy generated in the treating process.
Description
Technical field
The present invention relates to the treatment process in the textile chemical fiber field, relate in particular to the treatment of waste gas method that produces in a kind of production technology of bamboo wood dissolving pulp.
Background technology
Because fast development of society, living standards of the people improve constantly, and the consumption of social resources increases the natural rate of growth that has been far longer than resource, and the present resource of needs, particularly textile industry that can not satisfy social sustainable development is deficient.In textile industry in the past mainly is to be that primary raw material is produced with cotton and cotton linter, fiber crops etc.; Progressive at a high speed in society and develop today; People's quality of life standard first mate promotes; In continuous growth, the production of textile industry is in continuous growth to the quality of textile product and amount, but raw-material in short supplyly become increasingly conspicuous.Factor affecting can't be met the need of market because cotton output is ploughed etc.
Bamboo fibre has advantages such as good moisture absorption, moisture releasing, antibiotic, deodorizing, uvioresistant, is the novel fabric that following consumer liked, has vast market prospect.Bamboo wood has with short production cycle, reproducible resource.China has abundant bamboo resource.
China has carried out the production breakthrough that bamboo wood is produced bamboo pulp; Its production technology is first acidic hydrolysis or steam hydrolysis or water hydrolysis; After boiling again, bleaching; Still for the tradition hypochlorite or the chlorine dioxide that are adopted add the hydrogen peroxide bleaching production technology, perhaps adopt the one Chinese patent application number manufacturing approach for the bamboo dissolved pulp in " 200710050512.9 " at the bleaching handling procedure, its open day is on April 9th, 2008.But adopt the production method of above-mentioned bamboo wood dissolving pulp also to have following deficiency: bamboo wood is produced dissolving pulp and is adopted prehydrolytic sulfate process, has prehydrolysis exhaust-gas treatment environmental issue.Contain the inorganic matter that prehydrolysis extracts in the waste gas, some inorganic matters produce foul smell, generation 30-100m3/ ton slurry, and concentration is high, causes environmental pollution big, and conventional treatment method is directly to be emitted in the water, simply cool off, absorb, but treatment effect is not obvious.
Summary of the invention
The objective of the invention is to overcome the problems referred to above that exist in the production technology of existing bamboo wood dissolving pulp; A kind of treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp is provided; The present invention can handle the waste gas that the prehydrolysis of bamboo wood dissolving pulp prehydrolytic sulfate process produces; Reach non-pollution discharge, and can the heat energy in the processing procedure be recycled.
A kind of treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp is characterized in that comprising following processing step:
A, prehydrolysis exhaust; B, gas cooled formation on-condensible gas to discharging after the prehydrolysis; C, on-condensible gas is carried out alkali liquid washing absorb; D, the gas behind the alkali liquid washing is carried out high temperature degradation.
In the said a step, in the bamboo material, add acid water, steam or water and carry out prehydrolysis, 140-190 ℃ of prehydrolysis temperature, time 30-300min carries out little exhaust in the prehydrolysis process, accomplish the prehydrolysis exhaust.
In the said a step, in the bamboo material, add acid water, steam or water and carry out prehydrolysis, 140-190 ℃ of prehydrolysis temperature, time 30-300min in the exhaust of prehydrolysis terminal point, accomplishes the prehydrolysis exhaust.
In the said b step, the gas that prehydrolysis is discharged gets into the heat exchanger cooling, and chilling temperature forms on-condensible gas below 100 ℃.
In the said c step, with the sodium hydroxide solution of 10-100g/l on-condensible gas is carried out the alkali spray washing and absorb.
In the said d step; Gas behind neutralizing treatment gets into boiler or alkali stove flue; The gas that has smell to behind the alkali liquid washing is degraded to scentless low molecule organic matter in hot environment, also has portion gas to react with flue tail gas and generates scentless gas.
Employing the invention has the advantages that:
One, the present invention can handle the waste gas that the prehydrolysis of bamboo wood dissolving pulp prehydrolytic sulfate process produces, and reaches non-pollution discharge, has reduced environmental pollution.
Two, the present invention adopts the heat exchanger heat exchange to waste gas, can be with the heat energy recycle in the waste gas, and the hot water of displacement can be used for prehydrolysis and increases water usefulness newly, or other usefulness, has reduced production cost.
Three, the present invention adopts the heat exchanger heat exchange to waste gas, water vapor condensation, and odorous gas partly is condensed simultaneously, and is dissolved in the condensed water, can remove the part odorous gas.
Four, it is low to adopt the present invention to handle the waste gas cost that the prehydrolysis of bamboo wood dissolving pulp prehydrolytic sulfate process produces, and disposal cost is lower than 20 yuan of/ton slurries.
Five, the present invention's middle part division technique equipment existing device capable of using; Do not influence result of use, reach investment and economize most, the desulfurizing tower that the caustic scrubber that adopts like the alkali liquid washing in the technological process can utilize boiler flue vent gas to handle; The exhaust chimney of the flue of boiler or alkali stove boiler capable of using or alkali stove; Do not influence boiler desulfurization tower treatment effect, do not influence the exhaust effect of exhaust chimney yet, reduce investment.
Six, among the present invention, on-condensible gas is carried out the alkali spray washing absorb with the sodium hydroxide solution that carries out of 10-100g/l, the alkali of spray recycles, and the incoagulability odorous gas is prone to be dissolved in alkaline aqueous solution, can remove the part odorous gas.
Seven, among the present invention; In boiler or alkali stove flue, carry out high temperature degradation; The flue exhaust temperature is at 100-200 ℃, and the macromolecule gaseous matter of band foul smell is degraded into the low molecule organic matter of no stink once more in this environment, and part is carried out chemical reaction with the gas of smell with the tail gas in boiler or the alkali stove flue in addition; Generate the gas of no stink, finally reach no stink discharging.
The specific embodiment
Embodiment 1
A kind of treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp comprises following processing step:
A, prehydrolysis exhaust; B, the gas cooled of exhausted by prehydrolysis is formed on-condensible gas; C, on-condensible gas is carried out alkali liquid washing absorb; D, the gas behind the alkali liquid washing is carried out high temperature degradation.
In a step, the bamboo material gets into rotary spherical digester, adds acid water, 140 ℃ of prehydrolysis temperature, and time 30min carries out little exhaust in the prehydrolysis process, and exhaust from rotary spherical digester because rotary spherical digester self pressure makes gas pass through discharge of pipes to given place, is accomplished the prehydrolysis exhaust.
In the b step, the gas of discharge gets into the heat exchanger cooling through pipeline, and chilling temperature forms on-condensible gas at 98 ℃.
In the c step, use concentration on-condensible gas to be carried out the alkali spray washing and absorb as the sodium hydroxide solution of 10g/l.
In the d step, gas behind neutralizing treatment gets into boiler or alkali stove flue, and the gas of the band smell behind the alkali liquid washing is degraded to scentless low molecule organic matter in hot environment, also has part to carry out the scentless gas of reacted with flue tail gas.
Embodiment 2
A kind of treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp comprises following processing step:
A, prehydrolysis exhaust; B, the gas cooled of exhausted by prehydrolysis is formed on-condensible gas; C, on-condensible gas is carried out alkali liquid washing absorb; D, the gas behind the alkali liquid washing is carried out high temperature degradation.
In a step, the bamboo material gets into upright steamer, adds water vapour and carries out prehydrolysis, 1190 ℃ of prehydrolysis temperature; Time 300min, at the prehydrolysis terminal point, exhaust from upright steamer; Because upright steamer self pressure makes gas pass through discharge of pipes to given place, accomplishes the prehydrolysis exhaust.
In the b step, the gas of discharge gets into the heat exchanger cooling through pipeline, and chilling temperature forms on-condensible gas at 90 ℃.
In the c step, with the sodium hydroxide solution of 100g/l on-condensible gas is carried out the alkali spray washing and absorb.
In the d step, gas behind neutralizing treatment gets into boiler or alkali stove flue, and the gas of the band smell behind the alkali liquid washing is degraded to scentless low molecule organic matter in hot environment, also has portion gas to react with flue tail gas and generates scentless gas.
Embodiment 3
A kind of treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp comprises following processing step:
A, prehydrolysis exhaust; B, the gas cooled of exhausted by prehydrolysis is formed on-condensible gas; C, on-condensible gas is carried out alkali liquid washing absorb; D, the gas behind the alkali liquid washing is carried out high temperature degradation.
In a step, the bamboo material gets into batch digester, adds entry and carries out prehydrolysis; 160 ℃ of prehydrolysis temperature, time 150min is in the prehydrolysis process; From batch digester, carry out little exhaust,, accomplish the prehydrolysis exhaust because batch digester self pressure makes gas pass through discharge of pipes to given place.
In the b step, the gas of discharge gets into the heat exchanger cooling through pipeline, and chilling temperature forms on-condensible gas at 60 ℃.
In the c step, with the sodium hydroxide solution of 60g/l on-condensible gas is carried out the alkali spray washing and absorb.
In the d step, gas behind neutralizing treatment gets into boiler or alkali stove flue, and the gas of the band smell behind the alkali liquid washing is degraded to scentless low molecule organic matter in hot environment, also has part to react with flue tail gas and generates scentless gas.
Embodiment 4
A kind of treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp comprises following processing step:
A, prehydrolysis exhaust; B, the gas cooled of exhausted by prehydrolysis is formed on-condensible gas; C, on-condensible gas is carried out alkali liquid washing absorb; D, the gas behind the alkali liquid washing is carried out high temperature degradation.
In a step, the bamboo material gets into continuous steamer, and add acid water and carry out prehydrolysis, 150 ℃ of prehydrolysis temperature, time 120min carries out little exhaust in the prehydrolysis process, arrive given place through continuous steamer self pressure through discharge of pipes.At the prehydrolysis terminal point, exhaust from continuous steamer is arrived given place through continuous steamer self pressure through discharge of pipes, accomplishes the prehydrolysis exhaust.
In the b step, the gas of discharge gets into the heat exchanger cooling through pipeline, and chilling temperature forms on-condensible gas at 30 ℃.
In the c step, with the sodium hydroxide solution of 80g/l or other alkali lye on-condensible gas is carried out the alkali spray washing and absorb.
In the d step, gas behind neutralizing treatment gets into boiler or alkali stove flue, and the gas of the band smell behind the alkali liquid washing is degraded to scentless low molecule organic matter in hot environment, also has portion gas to react with flue tail gas and generates scentless gas.
Embodiment 5
The bamboo material gets into rotary spherical digester or batch digester or continuous steamers such as upright steamer or displacement cooking; Add acid water, steam or water and carry out prehydrolysis; 140-190 ℃ of prehydrolysis temperature, time 30-300min carries out little exhaust in the prehydrolysis process; Or during prehydrolysis terminal point removal waste fluid, produce a large amount of foul smell.Inorganic matter gas, steam of the stink of vaporization at high temperature etc. are arranged in the foul smell.Self pressure is carried air scavenge the pipeline entering heat exchanger that pass through that removes and is cooled off in the boiling vessel, and chilling temperature is below 100 ℃.Heat exchanger is used the cold water heat exchange, and the hot water of displacement can be used for prehydrolysis and increases water usefulness newly, or other usefulness.Water vapor condensation, odorous gas partly is condensed simultaneously, and is dissolved in the condensed water, removes the part odorous gas.
Gas becomes incoagulable gas behind heat exchanger,, under the effect that air exhauster is pumped, to caustic scrubber, carries out the alkali spray washing and absorbs technology through the air channel: NaOH 10-100g/l, spray flux is as the criterion according to producing exhausted air quantity.The spray theobromine recycles.The incoagulability odorous gas is prone to be dissolved in alkaline aqueous solution, removes the part odorous gas.
Through a small amount of odorous gas of neutralizing treatment, get into boiler or alkali stove flue again, 100-200 ℃ of alkali stove, boiler flue temperature; In the flue a spot of sulphur-containing substance is arranged simultaneously; It is acid that flue becomes, and the macromolecule gaseous matter of band foul smell is degraded into the low molecule organic matter of no stink once more in this environment, carry out chemical reaction with the tail gas in boiler or the alkali stove flue simultaneously; Generate the gas of no stink, finally reach no stink discharging.
The desulfurizing tower that caustic scrubber in the technological process can utilize boiler flue vent gas to handle, the flue boiler capable of using of boiler or alkali stove or the exhaust chimney of alkali stove.Do not influence boiler desulfurization tower treatment effect, do not influence the exhaust effect of exhaust chimney yet, reduce investment.
Prehydrolysis exhaust among the present invention also can adopt alternate manner of the prior art to realize; Gas cooled to discharging forms on-condensible gas; The also available alternate manner of the prior art of condensed gas is realized; On-condensible gas is carried out alkali liquid washing absorb the alkali liquid washing method of the prior art that also can adopt, the gas behind the alkali liquid washing is carried out the high temperature neutralization also can adopt high temperature degradation of the prior art and reactive mode.
Claims (4)
1. treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp is characterized in that comprising following processing step:
A, prehydrolysis exhaust; B, the gas cooled formation on-condensible gas to discharging after the prehydrolysis: the gas that prehydrolysis is discharged gets into the heat exchanger cooling, and chilling temperature forms on-condensible gas below 100 ℃; C, on-condensible gas is carried out alkali liquid washing absorb: the sodium hydroxide solution with 10-100g/l carries out the absorption of alkali spray washing to on-condensible gas; D, the gas behind the alkali liquid washing is carried out high temperature degradation.
2. treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp according to claim 1; It is characterized in that: in the said a step; In the bamboo material, add acid water, steam or water and carry out prehydrolysis, 140-190 ℃ of prehydrolysis temperature, time 30-300min; Carry out little exhaust in the prehydrolysis process, accomplish the prehydrolysis exhaust.
3. treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp according to claim 1 is characterized in that: in the said a step, in the bamboo material, add acid water, steam or water and carry out prehydrolysis; 140-190 ℃ of prehydrolysis temperature; Time 30-300min in the exhaust of prehydrolysis terminal point, accomplishes the prehydrolysis exhaust.
4. according to claim 1,2 or 3 described treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp; It is characterized in that: in the said d step; Gas behind neutralizing treatment gets into boiler or alkali stove flue; The gas that has smell to behind the alkali liquid washing is degraded to scentless low molecule organic matter in hot environment, also has portion gas to react with flue tail gas and generates scentless gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102634763A CN101721834B (en) | 2009-12-18 | 2009-12-18 | Treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102634763A CN101721834B (en) | 2009-12-18 | 2009-12-18 | Treatment method of waste gas generated by prehydrolysis of bamboo dissolving pulp |
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| CN101721834A CN101721834A (en) | 2010-06-09 |
| CN101721834B true CN101721834B (en) | 2012-11-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102995479B (en) * | 2011-09-09 | 2014-09-03 | 吉林化纤集团有限责任公司 | Method for processing exhaust gas of bamboo wood dissolving pulp |
| CN103451987B (en) * | 2013-08-23 | 2015-10-28 | 湖南骏泰浆纸有限责任公司 | A kind of dissolving pulp pre-hydrolyzed solution extracting method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280567B1 (en) * | 1997-10-16 | 2001-08-28 | Kvaerner Pulping Ab | System and method for treatment of cellulose-containing material prior to pulp digestion |
| CN201105201Y (en) * | 2006-12-28 | 2008-08-27 | 四川瑞松纸业有限公司 | Kraft pulping odor treatment device |
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- 2009-12-18 CN CN2009102634763A patent/CN101721834B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280567B1 (en) * | 1997-10-16 | 2001-08-28 | Kvaerner Pulping Ab | System and method for treatment of cellulose-containing material prior to pulp digestion |
| CN201105201Y (en) * | 2006-12-28 | 2008-08-27 | 四川瑞松纸业有限公司 | Kraft pulping odor treatment device |
Non-Patent Citations (1)
| Title |
|---|
| 雷以超等.楠竹纤维特性及预水解工艺的研究.《造纸科学与技术》.2007,第26卷(第6期),29-32. * |
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Effective date of registration: 20130603 Address after: 644002 space Road, Nan'an economic and Technological Development Zone, Yibin, Sichuan Patentee after: Yibin Grace Group Company Address before: 644300, No. 169, paper Road, Changning Town, Changning County, Yibin, Sichuan Patentee before: Yibin Zhuhai Bamboo Resource Technology Co., Ltd. Patentee before: Yibin Grace Group Company |
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