CN101985355B - Method and device for preparing activated carbon by using sludge - Google Patents
Method and device for preparing activated carbon by using sludge Download PDFInfo
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- CN101985355B CN101985355B CN2010105741308A CN201010574130A CN101985355B CN 101985355 B CN101985355 B CN 101985355B CN 2010105741308 A CN2010105741308 A CN 2010105741308A CN 201010574130 A CN201010574130 A CN 201010574130A CN 101985355 B CN101985355 B CN 101985355B
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Abstract
The invention discloses a method for preparing activated carbon by using sludge. The method comprises the following steps: proportionally adding an activating agent in dehydrated sludge containing about 80% of water for dipping and drying; feeding the mixture of the sludge and the activating agent in an activating device, wherein low-oxygen high-temperature smoke obtained by controlled oxygen combustion is adopted as an activating medium, the temperature is lower than 600 DEG C and the oxygen-containing amount is less than 4%; and washing and drying to prepare dried activated carbon, wherein the heat source used for drying the sludge after being dipped and drying the activated carbon after being activated and washed adopts high-temperature smoke after activation, and the temperature of the high-temperature smoke is generally lower than 500 DEG C. The invention also discloses a device for preparing the activated carbon by using sludge. The device comprises a mixed dipping kettle, a drier used after the sludge is dipped, a carbonization and activation device, a washing kettle and an activated carbon drier. In the invention, the low-oxygen high-temperature smoke serves as the activating medium and the dehydrated sludge is directly dipped, thereby simplifying the process of using the sludge to prepare the activated carbon, gradually using the heat energy of the high-temperature smoke according to grades and reducing the cost of using the sludge to prepare the activated carbon.
Description
Technical field
The present invention relates to the process method that a kind of dewatered sludge prepares gac; Relate in particular to a kind of utilize high-temperature flue gas as thermal source, activated media and protection gas will moisture 80% dewatered sludge directly prepare process of active carbon and device, with improve efficiency of energy utilization, reduction mud prepares the gac cost.
Background technology
Be accompanied by fast development and the people of the global economy growing interest to environment, sewage load increases at a high speed, has caused the rapid expansion of sludge yield.At present; China's annual discharging dewatered sludge is about 5,000,000 tons; And in continuous increase, as deal with improperly and can cause serious secondary pollution, the investment and the working cost of sludge treatment are huge simultaneously; Account for 25%～65% of investment of entire sewage factory and working cost, become the heavy burden that sewage work faces.
Active carbon is as a kind of adsoption catalysis material; Water insoluble and organic solvent; Be prone to regeneration; Organic or inorganic material in gas, the solution and colloidal solid etc. there is very strong adsorption capacity; Have enough chemical stabilities and acidproof, alkaline-resisting, hear resistance, be used widely at numerous areas such as oil, chemical industry, food, light industry, national defence, environmental protection.Containing more carbon in the mud, is that raw material can make carbon-bearing adsorbent through modification with mud under certain high temperature.The sorbent material that makes has very high COD clearance; It is a kind of treatment of Organic Wastewater agent of excellent property; Adsorb saturated sorbent material if can not regenerate, can under control tail gas condition, burn, the injurious factor in the primary sludge is decomposed by exhaustive oxidation as fuel.
Existing chemical method mud prepares in the activated carbon process, and the dry earlier washing of dewatered sludge is flooded, with high temperature inert gas (CO again
2Or N
2) for the sludge carbonization activation provides heat, and as protection gas.So the pyritous rare gas element has both increased facility investment generally through adopting other fuel indirect heating to obtain, many again energy consumptions have increased the manufacturing cost of gac, and complex process has hindered the industrial applications that mud prepares gac.
The present invention is that about 80% dewatered sludge is a raw material with water ratio, the direct impregnation without drying, and adopting high-temperature low-oxygen stack gas is activated media and for the sludge carbonization activation provides required heat, has reduced the consumption of high-grade energy, has reduced running cost.Because flue gas has certain oxygen level, under the hot conditions, the oxygen of trace can reach the purpose of preoxidation mud, and it is active to increase Sludge Surface, promotes the quality of activated carbon product.
Summary of the invention
The present invention provides the mud of a kind of economy, energy-saving and environmental protection to prepare process of active carbon and device; Utilize activated media, the protection gas of high-temperature low-oxygen flue gas as sludge carbonization; For the preoxidation of raw material provides oxygen part; And the thermal source of carbonization-activation is provided, and reduced the consumption of high-grade energy, the complicacy of technology and the manufacturing cost of active sludge carbon, improved the integration that rate of energy and mud prepare activated carbon system.
The present invention adopts following technical scheme:
A kind of dewatered sludge prepares the process method of gac, and step is following:
Step 1 directly with after acvator mixes, floods 10 ~ 24 hours by 10:1 ~ 4, is sent into moisture 75% ~ 85% wet mud drying machine and is carried out drying,
Send into the washing still after step 3 activation and carry out acid elution, dry then,
A kind ofly implement the device that above-mentioned mud prepares gac; Comprise drying machine, carbonization activator, washing still, gac drying machine after hybrid infusion still, mud flood; Exhanst gas outlet after being provided with control oxygen incendiary high-temperature low-oxygen gas approach and activation on the carbonization activator; Gas approach and the 1st dry back exhanst gas outlet, the 2nd dry back exhanst gas outlet after establishing gas approach after the 1st activation, the 2nd activation respectively on mud dipping after drying machine and the gac drying machine; The exhanst gas outlet of carbonization activator respectively be located at mud dipping after drying machine and gac drying machine on the 1st activation after after gas approach and the 2nd activation gas approach link to each other; The 1st dry back exhanst gas outlet emptying on the mud dipping after drying machine and the 2nd dry back exhanst gas outlet emptying on the gac drying machine, the outlet of hybrid infusion still link to each other with the import of mud dipping after drying machine, the outlet of mud dipping after drying machine links to each other with the carbonization activator import, the carbonization activator outlet links to each other, washs the still outlet with the import of washing still and links to each other with the import of gac drying machine.
Compared with prior art, the present invention has the following advantages:
1, the present invention adopts flue gas as sludge carbonization activatory thermal source, and effectively utilizes the fume afterheat after the activation, has improved energy utilization rate, has reduced the cost that energy consumption and mud prepare gac.
2, the present invention's protection gas, the activated media of flue gas during as the sludge carbonization activation of adopting the high temperature low oxygen content, the active sludge carbon ME has been simplified in the application of saving pure gas.
3, the present invention adopt low oxygen content flue gas for mud preoxidation provides the oxygen branch, make the surfactivity of mud granule increase, activation is deep into feed particles inside more easily, it is flourishing to make the gac hole.
4, to use water ratio be that about 80% dewatered sludge directly prepares gac in the present invention, saves the dry link when mud prepared gac in the past, reduced energy consumption, simplified active sludge carbon preparation technology.
5, the present invention has simplified the active sludge carbon ME, and system is highly integrated, simple to operateization.
6, the gac safety of prepared according to the invention, stable, pollution-free makes mud really reach the requirement of stabilization, innoxious, resource utilization.
Description of drawings:
Fig. 1 is the process method that dewatered sludge of the present invention prepares gac.
Among Fig. 1,1, dipping still 2, mud dipping after drying machine 3, carbonization activator 4, washing still 5, gac drying machine.
Embodiment
Embodiment 1:
A kind of dewatered sludge prepares the process method of gac, and step is following:
Step 1 directly with after acvator mixes, floods 10 ~ 24 hours by 10:1 ~ 4, is sent into moisture about 80% wet mud drying machine and is carried out drying,
Send into the washing still after step 3 activation and carry out acid elution, dry then,
A kind ofly implement the device that above-mentioned mud prepares gac; Comprise drying machine 2, carbonization activator 3, washing still 4, gac drying machine 5 after hybrid infusion still 1, mud flood; Exhanst gas outlet after being provided with control oxygen incendiary high-temperature low-oxygen gas approach and activation on the carbonization activator 3; Gas approach and the 1st dry back exhanst gas outlet, the 2nd dry back exhanst gas outlet after establishing gas approach after the 1st activation, the 2nd activation respectively on mud dipping after drying machine 2 and the gac drying machine 5; The exhanst gas outlet of carbonization activator 3 respectively be located at mud dipping after drying machine 2 and gac drying machine 5 on the 1st activation after after gas approach and the 2nd activation gas approach link to each other; The 1st dry back exhanst gas outlet emptying on the mud dipping after drying machine 2 and the 2nd dry back exhanst gas outlet emptying on the gac drying machine 5,1 outlet of hybrid infusion still link to each other with 2 imports of mud dipping after drying machine, 2 outlets of mud dipping after drying machine link to each other with carbonization activator 3 imports, carbonization activator 3 outlets link to each other, wash still 4 outlets with 4 imports of washing still and link to each other with 5 imports of gac drying machine.
With reference to the accompanying drawings, the present invention is made more detailed explanation:
With reference to Fig. 1; The wet mud of a kind of 80% dehydration directly prepares the device of gac; Comprise drying machine 2, carbonization activator 3, washing still 4, gac drying machine 5 after hybrid infusion still 1, mud flood; Exhanst gas outlet after being provided with control oxygen incendiary high-temperature low-oxygen gas approach and activation on the carbonization activator 3; Gas approach and the 1st dry back exhanst gas outlet, the 2nd dry back exhanst gas outlet after establishing gas approach after the 1st activation, the 2nd activation respectively on mud dipping after drying machine 2 and the gac drying machine 5; The exhanst gas outlet of carbonization activator 3 respectively be located at mud dipping after drying machine 2 and gac drying machine 5 on the 1st activation after after gas approach and the 2nd activation gas approach link to each other; The 1st dry back exhanst gas outlet emptying on the mud dipping after drying machine 2 and the 2nd dry back exhanst gas outlet emptying on the gac drying machine 5,1 outlet of hybrid infusion still link to each other with 2 imports of mud dipping after drying machine, 2 outlets of mud dipping after drying machine link to each other with carbonization activator 3 imports, carbonization activator 3 outlets link to each other, wash still 4 outlets with 4 imports of washing still and link to each other with 5 imports of gac drying machine.
(activation under the oxygen free condition) is that 80% municipal sludge is sent in the dipping still 1, with ZnCl with water ratio
2Be acvator; By impregnating ratio 5:1 (wet mud: acvator) mud was flooded 16 hours in dipping still 1; Mud after adopting 500 ℃ stack gas waste heat of part activation in drying machine 2 in, will flood is dried, and sends into subsequently in the carbonization activator 3 with nitrogen as protecting gas, under anoxia condition, carries out carbonization-activation; Control sludge activation temperature is 550 ℃, and soak time is 90 minutes.With after scouring, oven dry, obtain the dry product gac, its specific surface area is 493.1m
2/ g, methylene blue adsorption value are 120.1mg/g.
(under the aerobic conditions, oxygen level 2%) is that 80% municipal sludge is sent in the dipping still 1, with ZnCl with water ratio
2Be acvator; By impregnating ratio 5:1 (wet mud: acvator) mud was flooded 16 hours in dipping still 1; Mud oven dry after 500 ℃ stack gas waste heat of employing part activation will flood in drying machine 2; Send into subsequently in the carbonization activator 3 and to adopt that oxygen level is 2%, temperature is that 600 ℃ high-temperature low-oxygen flue gas carries out carbonization-activation, control sludge activation temperature is 550 ℃, soak time is 90 minutes.With after scouring, and with 500 ℃ of activation stack gas waste heat oven dry, obtain the dry product gac, its specific surface area is 516.1m
2/ g, methylene blue adsorption value are 129.8mg/g, and pore volume is 0.29cm
3/ g, micro pore volume are 0.16cm
3/ g, mean pore size is 3.95nm.
(under the aerobic conditions, oxygen level 4%) is that 80% municipal sludge is sent in the dipping still 1, with ZnCl with water ratio
2Be acvator; By impregnating ratio 5:1 (wet mud: acvator) mud was flooded 16 hours in dipping still 1; Mud oven dry after 500 ℃ stack gas waste heat of employing part activation will flood in drying machine 2; Send into subsequently in the carbonization activator 3 and to adopt that oxygen level is 4%, temperature is that 600 ℃ high-temperature low-oxygen flue gas carries out carbonization-activation, control sludge activation temperature is 550 ℃, soak time is 90 minutes.With after scouring, and with 500 ℃ of activation stack gas waste heat oven dry, obtain the dry product gac, its specific surface area is 512.8m
2/ g, methylene blue adsorption value are 129.1mg/g.
Oxygen can with carbon skeleton surface group generation oxidizing reaction, promote the formation and the development of activated carbon capillary.But when too high oxygen level; Sauerstoffatom and carbon skeleton surface group speed of response are exceedingly fast, and many oxygen molecules have little time to be diffused into the charcoal granule interior at all and just react with surface group, have limited the formation and the development of micropore; Simultaneously; Also make established micropore wall burnt, widen, gac specific surface area and micro pore volume can decline to a great extent with the increase of oxygen level, the absorption property variation.
Claims (1)
1. implement the device that mud prepares active carbon method for one kind; It is characterized in that; Comprise drying machine (2), carbonization activator (3), washing still (4), gac drying machine (5) after hybrid infusion still (1), mud flood; Exhanst gas outlet after being provided with control oxygen incendiary high-temperature low-oxygen gas approach and activation on the carbonization activator (3); Gas approach and the 1st dry back exhanst gas outlet, the 2nd dry back exhanst gas outlet after establishing gas approach after the 1st activation, the 2nd activation respectively on drying machine (2) behind the mud dipping and the gac drying machine (5); The exhanst gas outlet of carbonization activator (3) respectively be located at mud dipping after drying machine (2) and gac drying machine (5) on the 1st activation after after gas approach and the 2nd activation gas approach link to each other; Drying machine (2) import after the 2nd dry back exhanst gas outlet emptying on the 1st dry back exhanst gas outlet emptying on the drying machine (2) behind the mud dipping and the gac drying machine (5), hybrid infusion still (1) outlet and mud dipping links to each other, drying machine (2) outlet behind the mud dipping links to each other with carbonization activator (3) import, carbonization activator (3) exports with wash still (4) import links to each other, washs still (4) and export and link to each other with gac drying machine (5) import.
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| CN2010105741308A CN101985355B (en) | 2010-12-06 | 2010-12-06 | Method and device for preparing activated carbon by using sludge |
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| CN2010105741308A CN101985355B (en) | 2010-12-06 | 2010-12-06 | Method and device for preparing activated carbon by using sludge |
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| CN101985355B true CN101985355B (en) | 2012-11-14 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267695B (en) * | 2011-07-25 | 2012-10-17 | 中国石油天然气集团公司 | Method for preparing super activated charcoal from oily sludge |
| CN103769190A (en) * | 2014-01-27 | 2014-05-07 | 华南理工大学 | Method for preparing auto-doping carbon catalytic material of fuel cell by using excess sludge |
| CN105314807A (en) * | 2015-02-28 | 2016-02-10 | 南京万德斯环保科技有限公司 | Sludge disposal and utilization method based on cyclone drying and coupling pyrolysis technology |
| CN106927462A (en) * | 2017-04-24 | 2017-07-07 | 句容市百诚活性炭有限公司 | A kind of preparation method of active sludge carbon |
| CN107720749B (en) * | 2017-10-28 | 2023-09-19 | 洛阳建材建筑设计研究院有限公司 | Device and method for producing activated carbon and ceramsite by using sludge |
| CN111056552B (en) * | 2019-12-30 | 2024-04-19 | 广东职业技术学院 | Automatic treatment system for converting printing and dyeing sludge into activated carbon |
| CN114293364B (en) * | 2022-01-28 | 2023-09-26 | 华北电力大学（保定） | Carbon fiber activation method and equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391766A (en) * | 2008-10-21 | 2009-03-25 | 广西大学 | Method for preparing active carbon from pulping paper mill sludge |
| CN101423212A (en) * | 2008-11-25 | 2009-05-06 | 邹炎 | Method for preparing sludge active carbon by using sludge and sludge active carbon |
| CN201882915U (en) * | 2010-12-06 | 2011-06-29 | 东南大学 | Device for preparing activated carbon with sludge |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391766A (en) * | 2008-10-21 | 2009-03-25 | 广西大学 | Method for preparing active carbon from pulping paper mill sludge |
| CN101423212A (en) * | 2008-11-25 | 2009-05-06 | 邹炎 | Method for preparing sludge active carbon by using sludge and sludge active carbon |
| CN201882915U (en) * | 2010-12-06 | 2011-06-29 | 东南大学 | Device for preparing activated carbon with sludge |
Non-Patent Citations (2)
| Title |
|---|
| 污泥碳化制备活性炭;程晓波等;《化工环保》;20101031;第30卷(第5期);446-449 * |
| 程晓波等.污泥碳化制备活性炭.《化工环保》.2010,第30卷(第5期),446-449. |
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