CN1136965C - Method for regeneration, by micro-wave, of active carbon loading voltile and nonpolar organic matter - Google Patents
Method for regeneration, by micro-wave, of active carbon loading voltile and nonpolar organic matter Download PDFInfo
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- CN1136965C CN1136965C CNB001130390A CN00113039A CN1136965C CN 1136965 C CN1136965 C CN 1136965C CN B001130390 A CNB001130390 A CN B001130390A CN 00113039 A CN00113039 A CN 00113039A CN 1136965 C CN1136965 C CN 1136965C
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Abstract
The present invention discloses a method for regenerating active carbon carrying volatile nonpolar organisms by using microwaves as a heat source, which comprises: carrier gas pretreatment, measurement and control of pressure and flow rate, temperature drop recycle, etc. The present invention adopts a carrier gas source, a microwave heater and a regeneration reactor. The present invention is carried out under the technological conditions that the ratio of the microwave power to the amount of the active carbon is 70 to 90 w/g, the flow rate of the carrier gas is 0.1 to 0.3 m/s, and the regeneration time is 6 to 7 minutes. The regeneration process can not damage the adsorbate, and can be used for recycling the adsorbate. The present invention has the main characteristics of short regeneration time, low energy consumption, favorable restoration of adsorbability of regenerated carbon, simple technology and convenient operation, and does not pollute the environment.
Description
One, technical field: microwave back again carries volatile nonpolar organic matter process of active carbon, belongs to a kind of of electrical heating renovation process in the active carbon ramp regeneration.
Two, background technology: known gas treatment regeneration method of active carbon has ramp regeneration, pressure swing regeneration, displacement regeneration, purge several classes of regeneration, to adsorbate is volatile nonpolar organic matter charcoal absorption system, usually using heats up and feed carrier gas purges in conjunction with regenerating, general earlier carrier gas (water vapour or air) directly the heating, make it pass through active carbon layer again, active carbon is regenerated, the characteristics of these class methods are that the heat transfer direction is to nexine from the active carbon top layer in the regenerative process, the mass transfer direction is then opposite, cause resistance to mass tranfer to increase like this, influence mass transfer effect, and then the recovery time long (30～100min), in addition, hot-air and water vapour heated up earlier to regenerate makes energy consumption higher, and heat utilization efficiency is lower.
The result of practical application in industry shows that the deficiency that existing above-mentioned each renovation process exists is:
1) the charcoal proportion of goods damageds are higher relatively: 3～15%;
2) recovery time is longer: 30～100min;
3) charcoal absorption capacity restoration rate is not high;
4) regenerative process energy consumption height;
5) reclaim equiment complexity;
6) regeneration times is too much, and the deterioration of active carbon is serious;
7) regeneration cost shared proportion in whole absorbing process is very big.
Microwave heating technique successful Application in fields such as food processing, dry materials, chemical reactions, compared a lot of advantages with traditional mode of heating, as energy utilization rate height, firing rate fast (be traditional heating mode 1/tens to 1/tens in addition shorter).It is reported that microwave has in water treatment active carbon regeneration field as the thermal source regenerated carbon and uses, but still is in the starting stage, be used for regeneration gas processing active carbon and then all belong to blank both at home and abroad.
In view of all many-sides of traditional active carbon method need to improve, heating using microwave can be used for the regeneration of water treatment active carbon, and the gas treatment active carbon particularly carries the different of volatile nonpolar organic matter active carbon and water treatment active carbon regenerative process, has impelled formation of the present invention.
Three, summary of the invention: purpose of the present invention is intended to utilize heating using microwave energy utilization rate height, fast, the homogeneous heating of firing rate, thermograde is little, heat simultaneously the inside and outside when being used for active carbon regeneration, internal temperature is a little more than external temperature, heat transfer direction and characteristics such as the mass transfer direction is consistent, microwave is directly acted on active carbon as thermal source, improve traditional thermal regeneration active carbon method, set up a kind of new volatile nonpolar organic matter regeneration method of active carbon.
The present invention relies on following technical scheme to realize.
1. Fig. 1 is a process chart of the present invention.After preliminary treatment, control its flow and pressure from the carrier gas that the carrier gas source of the gas comes out, enter the active carbon regeneration reactor that is positioned at microwave applicator, to carrying processings of regenerating of a volatile nonpolar organic matter active carbon, the active carbon that obtains regenerating, exit flow recycles through cooling.
The alternative condition of carrier gas be in the micro wave regeneration process not can with adsorbate and active carbon generation chemical reaction, nitrogen or inert gas are used in the regeneration of carrying volatile nonpolar organic matter active carbon, in addition, carrier gas source also provides power, makes carrier gas possess certain pressure to pass through regenerative system; The carrier gas pretreatment unit comprises silica gel and activated-charcoal column, and its effect is to utilize silica gel and active carbon to the suction-operated of moisture content and other impurity, removes moisture content and impurity in the carrier gas; Flow and pressure control section are that the control carrier gas is passed through regeneration reactor with the required flow velocity of technology; Microwave applicator is that microwave power decides according to amounts of activated carbon for active carbon regeneration provides certain frequency and required microwave radiation; The material of active carbon regeneration reactor must guarantee the penetrable and energy high temperature resistant (more than 800 ℃) of microwave, the most handy quartz glass; Exit flow after micro wave regeneration is carrier gas and adsorbate mixed airflow, must handle through cooling, and the present invention lowers the temperature by water cooling heat exchanger to reclaim the adsorbate of condensation.
2. process conditions
The important indicator that active carbon regeneration generally needs to consider is the adsorption capacity and the active carbon proportion of goods damageds of desorption rate, regenerated carbon, through experimental studies have found that the principal element (process conditions) that influences these several indexs has microwave power, amounts of activated carbon, recovery time and flow rate of carrier gas etc.
Each process conditions to desorption rate to influence rule as follows:
1) desorption rate is influenced size and be followed successively by amounts of activated carbon, microwave power, microwave irradiation time, nitrogen linear velocity;
2) amounts of activated carbon increases the raising that helps desorption rate; The increase of microwave power helps the raising of desorption rate; Recovery time, long more desorption rate was high more; The nitrogen linear velocity is not remarkable to the influence of desorption rate.
Each process conditions to the regenerated carbon adsorption capacity to influence rule as follows:
1) size that influences to adsorption capacity is followed successively by amounts of activated carbon, nitrogen linear velocity, microwave power, microwave irradiation time;
2) adsorbance of the big more regenerated carbon of amounts of activated carbon is big more in the regeneration; The big more regenerated carbon adsorbance of microwave power is high more; The length of recovery time is little to the influence of regenerated carbon adsorbance, but growth in time, the regenerated carbon adsorbance also increases thereupon; Flow rate of carrier gas is greater than or less than the raising that 0.4m/s helps the regenerated carbon adsorbance.
It is big more that each process conditions is embodied in microwave power to the influence of the active carbon proportion of goods damageds, and the loss of active carbon is big more; The excessive too small active carbon loss increase that all can make of carrier gas line speed; Amounts of activated carbon is big more, and the active carbon loss is big more.
Technological condition of regeneration according to above-mentioned rule optimization is: microwave power/amounts of activated carbon 70～90W/g active carbon, flow rate of carrier gas 0.1～0.3m/s, recovery time 6～7min.
3. regenerative process can be calculated the residual quantity of adsorbate on the active carbon of any time in the micro wave regeneration process with following formula among the present invention
Formula 1) residual quantity of adsorbate on q in---any time active carbon, kg adsorbate/kg active carbon;
q
0---the adsorbance of the active carbon when regenerating, kg adsorbate/kg active carbon;
T---the time, s;
M
C---quality of activated carbon, kg;
Formula 2) U---flow rate of carrier gas in, m/s;
F---regeneration reactor cross-sectional area, m
2
M---adsorption molecule amount;
Pv---adsorbate saturated vapour pressure, mmHg;
LogPv=-0.05223A/T+B, A wherein, B is a constant, T is a t active carbon temperature (K) constantly, is calculated by active carbon intensification equation.
Find the solution 1) boundary condition and the primary condition of formula be
t＝0，q＝q
0；
t＝t
M，q＝0；
q≤q
0
T
MBe adsorbate evaporation concluding time, s.
Adsorption density is calculated by following formula in any time exit flow
-dq/dt＝C
T·Q 3)
Q in the formula, t---meaning is the same;
Q---carrier gas flux, m
3/ s;
C
t---the mean concentration of adsorbate in the dt time, kg/m
3
Formula 3) be an ODE, owing to the time is 0 o'clock, q=q
0, substitution 1 again) in the q expression formula, can solve C
TWith the relation of t, promptly the toluene exit concentration over time.
4. technical indicator of the present invention and characteristic
The present invention can reach following technical indicator:
Recovery time: 6～7min; Adsorbance recovery rate 85～110%; The charcoal proportion of goods damageds＜9%; Total energy consumption (power consumption)≤9.07kwh/kg active carbon.
Show that with renovation process comparative result commonly used the present invention has following technological merit:
1) technology is simple, and the recovery time is short, is 1/2～1/140 of conventional regeneration method;
2) absorption property of regenerated carbon recovers good; Because toluene has dilating effect to the active carbon hole when sharply evaporating, regenerated carbon adsorption rate even can surpass fresh charcoal;
3) not consumption of calorie, steam of regenerative process, energy consumption is far below the method beyond the forced electric discharge reactivating, owing to do not consume extra heat and steam, so technology is simple, easy and simple to handle;
4) can reclaim adsorbate, because regeneration adsorbate purity height does not have other accessory substance, it is very high to reclaim product purity, because microwave energy can not cause the disconnection of chemical bond, so when being applied to other organic adsorbate, can not producing because of organic matter yet and decompose the secondary pollution that produces.
Four, description of drawings: Fig. 1 is a process chart of the present invention, and 1 for the carrier gas source of the gas among Fig. 1, and 2 are the carrier gas impurity removing apparatus, and 3 be carrier gas flux and pressure control metering device, and 4 be microwave applicator, 5, be regeneration reactor, and 6 is recovery adsorbate receiving system.Fig. 2 is the composition structure chart of microwave applicator, and 8 is micro-wave oven among the figure, and 9 is regeneration reactor, and 10 is armoured thermocouple, and 11 is digital display temperature indicator, and 12 for treating regenerated carbon.
Five, specific embodiment embodiment: adopt the technological process shown in the accompanying drawing 1, carrier gas is a nitrogen, and pretreatment portion is divided into the drying tube that active carbon and silica gel are housed, and the employing range of flow is 0～1.5m
3The spinner flowmeter meter flow of/h, measure pressure with the U-shaped mercury gage, microwave applicator is rated output power 700W (adjustable power) micro-wave oven, regeneration reactor is made (high 130mm by quartz glass, diameter 26mm), the concrete form of regeneration reactor and microwave applicator as shown in Figure 2, the cooling recovery section is long 150mm, diameter 40mm serpentine condenser, adsorbate reclaims with conical flask, the active carbon of handling of regenerating is that Chongqing Bei Bei chemical reagent factory produces HG3-1290-80 type granular active carbon, and adsorbate is a toluene, and active carbon is 0.31kg toluene/kg active carbon to the adsorption capacity of toluene.
Technological condition of regeneration is: flow rate of carrier gas 0.2m/s, microwave power/amounts of activated carbon 70W/g, recovery time 6min.
Regeneration toluene desorption rate as a result is 99%, and the active carbon proportion of goods damageds are 5%, and the regenerated carbon adsorption capacity is 0.34kg toluene/kg active carbon, and toluene level is 74.5% in the recovery gained toluene liquid.
Claims (3)
1. the method for a regeneration, by micro-wave, of active carbon loading voltile and nonpolar organic matter, technological process comprises the carrier gas preliminary treatment, controls its flow and pressure, enter the active carbon regeneration reactor that is positioned at microwave applicator, to carrying the processing of regenerating of a volatile nonpolar organic matter active carbon, obtain regenerated carbon, exit flow is characterized in that through the cooling recycling:
Process conditions: microwave power is 70～90w/g with the ratio of amounts of activated carbon, flow rate of carrier gas 0.1～0.3m/s, and recovery time 6～7min, carrier gas is an inert gas.
2. micro wave regeneration process of active carbon according to claim 1 is characterized in that: carrier gas is a nitrogen.
3. micro wave regeneration process of active carbon according to claim 1, it is characterized in that: regeneration reactor is processed by quartz glass.
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| CNB001130390A CN1136965C (en) | 2000-06-16 | 2000-06-16 | Method for regeneration, by micro-wave, of active carbon loading voltile and nonpolar organic matter |
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| CNB001130390A CN1136965C (en) | 2000-06-16 | 2000-06-16 | Method for regeneration, by micro-wave, of active carbon loading voltile and nonpolar organic matter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1313202C (en) * | 2005-03-10 | 2007-05-02 | 上海交通大学 | Microwave, ultrasonic wave regeneration active carbon filtering device |
| CN100336588C (en) * | 2004-12-30 | 2007-09-12 | 昆明理工大学 | Process for regenerating sulfur loading active carbon |
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| US6793866B2 (en) | 2001-10-23 | 2004-09-21 | Equistar Chemicals, Lp | Process for producing bonded activated carbon structures and articles |
| CN100334237C (en) * | 2003-08-30 | 2007-08-29 | 大连理工大学 | Reproducing method for carrier gold activated carbon |
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| CN103084155B (en) * | 2011-11-03 | 2016-04-06 | 中国地质大学（北京） | A kind of method of microwave-assisted regeneration active carbon |
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| CN103736474B (en) * | 2014-01-22 | 2015-06-24 | 湖北君集水处理有限公司 | Microwave oven for regenerating powder active carbon |
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| CN112058250A (en) * | 2020-08-25 | 2020-12-11 | 华南理工大学 | Method for carrier gas assisted microwave-vacuum combined regeneration of volatile organic compound-loaded adsorbent and device for method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336588C (en) * | 2004-12-30 | 2007-09-12 | 昆明理工大学 | Process for regenerating sulfur loading active carbon |
| CN1313202C (en) * | 2005-03-10 | 2007-05-02 | 上海交通大学 | Microwave, ultrasonic wave regeneration active carbon filtering device |
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