CN115634677B - Activated carbon desorption method and activated carbon desorption equipment - Google Patents
Activated carbon desorption method and activated carbon desorption equipment Download PDFInfo
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Abstract
The invention discloses an activated carbon desorption method and activated carbon desorption equipment, and relates to the field of waste gas treatment. The activated carbon desorption method comprises the following steps: s01, feeding the activated carbon adsorbed with the volatile organic compounds into a pressure container, introducing water vapor into the pressure container, heating and pressurizing the activated carbon, and maintaining the pressure in the pressure container to desorb the volatile organic compounds in the activated carbon; and S02, cooling, decompressing and desorbing, vacuumizing after decompression, and discharging volatile organic compounds to obtain the desorbed activated carbon. The active carbon is steamed and cured in the pressure container through the water vapor, so that the desorption rate can be effectively improved, and then the water in the active carbon can be quickly removed through decompression and desorption, so that the desorption rate can be further improved.
Description
Technical Field
The invention relates to the field of waste gas treatment, in particular to an activated carbon desorption method and activated carbon desorption equipment.
Background
The activated carbon has low price and good adsorption effect, and is a main material for adsorbing the waste gas at present. When the activated carbon is saturated, the activated carbon needs to be replaced or desorbed for regeneration. Currently, the common methods for desorbing the activated carbon mainly comprise a hot air desorption method and a water vapor desorption method.
The hot air desorption is to blow off the activated carbon by hot air to release the adsorbed organic matters, but the temperature of the hot air cannot be too high (generally not more than 100 ℃), otherwise, the activated carbon is easy to self-ignite. Due to the insufficient temperature of the hot air desorption, the desorption of the activated carbon is insufficient. Volatile organic compounds with large molecular weight can be retained in the activated carbon and cannot be released by hot air under normal pressure. In addition, organic materials having a high boiling point, such as xylene (having a boiling point of about 140 ℃ C.), cannot be gasified and remain in the activated carbon because the temperature of the hot air is not high enough. Therefore, the desorption rate of the activated carbon desorbed by hot air is about 90%, after 6 times of desorption, the availability rate of the activated carbon is only about 53%, the activated carbon needs to be replaced, and the number of times of reutilization of the activated carbon is small.
The water vapor desorption rule is to use water vapor to blow off the activated carbon, because water vapor can not cause the activated carbon spontaneous combustion, and the temperature of water vapor can be higher than hot-blast, but to substances such as xylol equally have desorption capacity not enough problem, in addition, in the continuous blow off of water vapor, still can bring a large amount of moisture for the activated carbon, except that need longer time to dry the activated carbon, still can produce more waste water.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an activated carbon desorption method and activated carbon desorption equipment, and aims to solve the technical problems that the desorption rate of a steam desorption method is not high, and a large amount of moisture is brought to activated carbon to cause long drying time in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an activated carbon desorption method comprises the following steps:
s01, feeding the activated carbon adsorbed with the volatile organic compounds into a pressure container, introducing water vapor into the pressure container, heating and pressurizing the activated carbon, and maintaining the pressure in the pressure container to desorb the volatile organic compounds in the activated carbon;
and S02, cooling, performing reduced pressure desorption, performing vacuum pumping after pressure relief, and discharging volatile organic compounds to obtain the desorption activated carbon.
The activated carbon desorption method comprises the step of heating until the temperature in the pressure container reaches more than 150 ℃ in the heating and pressurizing treatment.
In the activated carbon desorption method, the temperature in the pressure vessel is controlled to be 150-160 ℃ during the heating and pressurizing treatment.
The activated carbon desorption method comprises the step of maintaining the temperature and the pressure for more than 30 minutes when the temperature in the pressure container reaches more than 150 ℃ and the pressure reaches more than 0.7 MPa.
The activated carbon desorption method, wherein the reduced-pressure desorption comprises: and vacuumizing to form a negative pressure state in the pressure container.
In the activated carbon desorption method, during the pressure relief, gas in the pressure container is discharged firstly, and then accumulated water in the pressure container is discharged.
The activated carbon desorption method further comprises the steps of cooling gas and accumulated water discharged from the pressure container through a cooling system, and collecting the cooled mixed liquid.
An activated carbon desorption device is used for implementing the activated carbon desorption method, and comprises a steam generator, a pressure vessel, a primary heat exchange device, a secondary heat exchange device, a vacuum pump and a liquid storage tank which are connected in sequence; the pressure container is used for pressurizing and heating the activated carbon.
The activated carbon desorption equipment is characterized in that the top of the pressure container is provided with an exhaust port, the bottom of the pressure container is also provided with an air inlet and a water outlet, and the exhaust port and the water outlet are respectively communicated with the primary heat exchange device; the air inlet is communicated with the steam generator.
The activated carbon desorption equipment is characterized in that the pressure container is also provided with a control device, and a pressure sensor, a temperature sensor, an exhaust valve, a drain valve and an air inlet valve which are respectively and electrically connected with the control device; the exhaust valve is used for controlling the communication between the exhaust port of the pressure container and the primary heat exchange device; the drain valve is used for controlling the communication between the water outlet of the pressure container and the primary heat exchange device; the air inlet valve is used for controlling the communication between the steam generator and the air inlet of the pressure vessel.
Has the advantages that:
the invention provides an activated carbon desorption method, which is characterized in that activated carbon adsorbed with volatile organic compounds is desorbed through water vapor, and the organic compounds with larger molecular weight and the organic compounds with higher saturated vapor pressure can be effectively activated and gasified under the action of pressure and high temperature in the desorption process through the water vapor, so that the organic compounds are desorbed and escaped from the inside of the activated carbon. In addition, the invention firstly heats and pressurizes the activated carbon in the pressure container, which can fully desorb the organic matter, compared with the continuous stripping by adopting the water vapor, the invention greatly reduces the consumption of the water vapor and the water absorbed by the activated carbon, can reduce the energy consumption and accelerate the drying of the activated carbon. After heating and pressurizing treatment, the temperature can be quickly reduced and the moisture in the activated carbon can be removed through decompression and desorption, in the vacuumizing process, the residual moisture and volatile organic compounds in the activated carbon can continuously form low-pressure boiling and are discharged through a vacuum pipeline, and the purposes of desorption and drying can be further achieved. The technical scheme of the invention can analyze more than 99% of volatile organic compounds in the activated carbon, greatly prolong the service life of the activated carbon and greatly reduce the operation cost of enterprises.
The invention also provides activated carbon desorption equipment which desorbs activated carbon based on the activated carbon desorption method, wherein the steam generator is used for supplying steam to the pressure vessel, the pressure vessel can bear high pressure, and the activated carbon can be subjected to high-temperature pressurized desorption treatment in the activated carbon, so that volatile organic compounds are effectively desorbed. And pumping the desorbed gas out of the pressure container, and cooling and collecting the gas. After the vacuum pump discharges gas and moisture, the vacuum pump can also enable negative pressure to be formed in the pressure container and approach a vacuum state, and the moisture and residual volatile organic compounds in the activated carbon can be removed more fully. The total cost of the equipment is low, the price is less than one tenth of that of the hot air on-line desorption equipment, the desorption effect is far better than that of the hot air desorption, the energy consumption is only one thirty times of that of the hot air desorption, and the equipment can benefit wide small and medium-sized enterprises.
Drawings
Fig. 1 is a schematic structural diagram of activated carbon desorption equipment provided by the invention.
Fig. 2 is a schematic structural diagram of activated carbon desorption equipment provided by the invention.
FIG. 3 is a diagram showing the effect of the activated carbon desorbed by the present invention.
Description of the main element symbols: the system comprises a steam generator 1, a pressure container 2, a primary heat exchange device 3, a secondary heat exchange device 4, a vacuum pump 5, a liquid storage tank 6, a support frame 21, a cooling tower 31, a first plate heat exchanger 32, a water cooler 41, a second plate heat exchanger 42, a control device 7, a pressure sensor 22, a temperature sensor 23, an exhaust valve 24, a drain valve 25, an air inlet valve 26, a safety valve 27, a water softener 8, a water storage tank 9 and a natural gas pipeline 10.
Detailed Description
The invention provides an activated carbon desorption method and activated carbon desorption equipment, and in order to make the purposes, technical schemes and effects of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specified.
The invention provides an activated carbon desorption method, which comprises the following steps:
s01, feeding the activated carbon adsorbed with the volatile organic compounds into a pressure container, introducing water vapor into the pressure container, heating and pressurizing the activated carbon, and maintaining the pressure in the pressure container to desorb the volatile organic compounds in the activated carbon;
the enthalpy of the water vapor is high, the temperature in the pressure container can be quickly raised, the saturated vapor pressure of the volatile organic compounds in a closed space can be increased along with the rise of the temperature, and the substances are easier to desorb from the activated carbon when the saturated vapor pressure is higher, so that the volatile organic compounds with high saturated vapor pressure can be desorbed when the temperature in the pressure container reaches a certain temperature range.
S02, cooling, decompressing and desorbing, vacuumizing after pressure relief, and discharging volatile organic compounds to obtain desorbed active carbon;
after carrying out the pressurize and handling a period of time, discharge the mist and ponding in the pressure vessel, adopt steam to carry out the pressure-increasing heating and can make the pressure vessel reach specific temperature and pressure fast, and ponding is less in the pressure vessel, become negative pressure or even vacuum state through the pressure in the evacuation pressure vessel after the pressure release again, can make a small amount of ponding in the pressure vessel and remaining volatile organic matter form the flash distillation, because the pressure in the in-process of evacuation constantly reduces the pressure in the pressure vessel, even the temperature in the pressure vessel also drops, but still can make ponding and remaining volatile organic matter keep the boiling state, make the active carbon desorption fully, and dry desorption active carbon fast.
Compared with the method for continuously blowing off the activated carbon by adopting the water vapor, the method can greatly reduce the using amount of the water vapor and improve the desorption rate of the volatile organic compounds. Because the consumption of the water vapor is less, the produced waste water is correspondingly less, and the energy consumption is lower.
Preferably, in the heating and pressurizing treatment, the pressure vessel is heated to a temperature of 150 ℃ or higher. When the temperature in the pressure container reaches above 150 ℃, organic matters such as benzene, toluene, xylene and the like can be well desorbed.
Preferably, in the heating and pressurizing treatment, the temperature in the pressure vessel is controlled to 150 to 160 ℃.
Preferably, when the temperature in the pressure vessel reaches 150 ℃ or higher and the pressure reaches 0.7MPa or higher, the temperature and the pressure are maintained for 30 minutes or longer. If only high-temperature and high-pressure water vapor is used for stripping, the pressure and the temperature in the activated carbon cannot completely reach the same pressure value and temperature as the water vapor, and the temperature and the pressure value in the pressure container are limited to be more than a specific value, so that the temperature and the pressure in the activated carbon are ensured to reach the required values, and the complete stripping is ensured.
Preferably, the reduced pressure desorption comprises: and vacuumizing to form negative pressure state in the pressure container. Because the moisture is remained in the activated carbon, before the moisture is completely extracted, the pressure container can only be in a state close to vacuum, under a sufficient low-pressure condition or a condition close to vacuum, the moisture and a small amount of residual volatile organic compounds can be boiled at low pressure, and after the moisture and the volatile organic compounds are volatilized, the activated carbon can be dried and the desorption rate can be further improved.
Preferably, in the pressure relief, the gas in the pressure container is discharged firstly, and then the accumulated water in the pressure container is discharged. The gas in the pressure vessel of discharging earlier can avoid the volatile organic compounds of desorption out to be adsorbed by active carbon again after temperature and pressure reduce, in addition, at the in-process of release pressure, the high temperature ponding of active carbon below forms the flash distillation, lets the mixed gas of upper strata discharge pressure vessel fully, and the steam that rises simultaneously also can form the air stripping to active carbon.
Preferably, the activated carbon desorption method further comprises cooling the gas and the accumulated water discharged from the pressure vessel by a cooling system, and collecting the mixed liquid obtained after cooling.
Referring to fig. 1, an activated carbon desorption apparatus includes a steam generator 1, a pressure vessel 2, a primary heat exchange device 3, a secondary heat exchange device 4, a vacuum pump 5 and a liquid storage tank 6, which are connected in sequence; the pressure vessel 2 is used for pressurizing and heating the activated carbon.
Specifically, the pressure vessel 2 is provided with a feed inlet for feeding activated carbon. In the using process, firstly, the activated carbon to be desorbed is fed into the pressure container 2, and the feeding hole of the pressure container 2 is closed. The activated carbon is placed on the support frame 21 and keeps a certain distance from the bottom of the pressure container 2, so that the activated carbon is prevented from being soaked by accumulated water; for ease of operation, the support frame 21 may be pushed into the pressure vessel 2 by a trolley.
After the activated carbon is placed, firstly closing a pipeline between the pressure container 2 and the primary heat exchange device 3, opening a pipeline between the steam generator 1 and the pressure container 2, then starting the steam generator 1 to generate steam, raising the temperature and the pressure in the pressure container 2, starting timing when the pressure reaches over 0.7MPa, maintaining the pressure for at least 30 minutes, and then closing the pipeline between the steam generator 1 and the pressure container 2.
After the pressure vessel 2 is naturally cooled and depressurized for a period of time, the vacuum pump 5, the first-stage heat exchange device 3 and the second-stage heat exchange device 4 are started, then a pipeline between the pressure vessel 2 and the first-stage heat exchange device 3 is opened, discharged mixed gas and accumulated water sequentially pass through the first-stage heat exchange device 3 and the second-stage heat exchange device 4, and the mixed gas and the accumulated water are cooled and then enter the liquid storage tank 6 to be collected.
And keeping the vacuum pump 5 running to change the pressure in the pressure container 2 into negative pressure and approach a vacuum state, so that the water or a small amount of residual volatile organic compounds in the activated carbon forms low-pressure boiling, the activated carbon is dried, and the desorption rate is improved.
When the temperature in the pressure container 2 is reduced to below 50 ℃, the desorption of the activated carbon is completed, and the activated carbon in the pressure container 2 can be taken out.
Preferably, the pressure vessel 2 is an autoclave.
Preferably, the liquid storage tank 6 is a heat preservation liquid storage tank, so that the mixed liquid collected after cooling can be kept at a low temperature.
In one embodiment, the top of the pressure vessel 2 is provided with an exhaust port, and the bottom thereof is further provided with an air inlet and a water outlet, which are respectively communicated with the primary heat exchange device 3; the air inlet is in communication with the steam generator 1. In use, after the pressure maintaining is finished, the air inlet is closed, the vacuum pump 5 is opened in advance, then the exhaust port at the top of the pressure container 2 is opened first, the stored steam and the flash steam in the pressure container 2 are exhausted first, and then the water outlet at the bottom of the pressure container 2 is opened to exhaust accumulated water. The gas is discharged firstly and then the accumulated water is discharged, so that the volatile organic compounds in the desorbed gas can be prevented from being adsorbed by the active carbon again after the temperature is reduced. Preferably, the exhaust pipeline and the drainage pipeline which are respectively connected with the exhaust port and the drainage port are merged and then enter the primary heat exchange device 3. The air inlet is arranged at the bottom of the pressure container 2, and can reduce accumulated water in the water vapor from being sprayed onto the activated carbon.
Compared with the on-line adsorption and hot air desorption equipment, the invention has lower manufacturing cost due to different pressure-resistant requirements on pipelines and equipment shells, can be suitable for wide middle and small enterprises, and greatly reduces the equipment acquisition cost and the operation cost.
Referring to fig. 2, in one embodiment, the primary heat exchange device 3 includes a cooling tower 31 and a first plate heat exchanger 32; a first heat exchange pipeline and a second heat exchange pipeline are arranged on the first plate type heat exchanger 32; the inlet of the first heat exchange pipeline is respectively communicated with the air exhaust port and the water outlet, and the outlet of the first heat exchange pipeline is communicated with the secondary heat exchange device 4; the second heat exchange pipe is communicated with the cooling tower 31, and the second heat exchange pipe contains a cooling medium and circularly flows through a circulating pump. In the first plate heat exchanger 32, high-temperature gas and liquid in the first heat exchange pipe exchange heat with the cooling medium in the second heat exchange pipe, so that the temperature of the gas-liquid mixture in the first heat exchange pipe is reduced, the cooling medium after heat exchange flows back to the cooling tower 31, and the cooling medium in the second heat exchange pipe is cooled by air. The first plate heat exchanger 32 cools and liquefies the desorbed gas, the cooling liquid and the accumulated water form a mixed liquid, and the temperature of the mixed liquid can be reduced to below 40 ℃ after passing through the first plate heat exchanger 32. In the invention, the accumulated water formed in the pressure container 2 is less, and most of the accumulated water is discharged in a flash evaporation mode, so the discharged accumulated water can be directly mixed with the gas, and the separated treatment is not needed.
Referring to fig. 2, in one embodiment, the secondary heat exchange device 4 includes a water chiller 41 and a second plate heat exchanger 42; a third heat exchange pipeline and a fourth heat exchange pipeline are arranged on the second plate type heat exchanger 42; an inlet of the third heat exchange pipeline is communicated with an outlet of the first heat exchange pipeline, and an outlet of the third heat exchange pipeline is communicated with a vacuum pump 5; the water chiller 41 is used for preparing cold water, and the temperature of the mixed liquid is further reduced to below 20 ℃ through the second plate heat exchanger 42, so that volatilization of volatile organic compounds in the mixed liquid can be reduced, and the mixed liquid can be collected through the liquid storage tank 6. The gas-liquid mixture in the first heat exchange pipeline enters the third heat exchange pipeline after the first heat exchange, the third heat exchange pipeline exchanges heat with the fourth heat exchange pipeline in the second plate heat exchanger 42, and the temperature of the gas-liquid mixture is further reduced after the second heat exchange.
Referring to fig. 2, preferably, the pressure vessel 2 is further provided with a control device 7, and a pressure sensor 22, a temperature sensor 23, an exhaust valve 24, a drain valve 25 and an intake valve 26 which are respectively electrically connected with the control device 7; the exhaust valve 24 is used for controlling the communication between the exhaust port of the pressure container 2 and the primary heat exchange device 3; the drain valve 25 is used for controlling the communication between the water outlet of the pressure container 2 and the first-stage heat exchange device 3; the inlet valve 26 is used to control the communication of the steam generator 1 with the inlet of the pressure vessel 2. Specifically, the exhaust valve 24, the drain valve 25, and the intake valve 26 are all electronic valves. By means of the control device 7, the air intake, air exhaust and water discharge operations of the pressure vessel 2 can be controlled automatically by means of a preset program without manual operations.
As a further improvement, the control device 7 may be further electrically connected to the steam generator 1, the primary heat exchange device 3, the secondary heat exchange device 4, and the vacuum pump 5, respectively, so as to intelligently control the entire activated carbon desorption apparatus.
Referring to fig. 2, in particular, the pressure vessel 2 is further provided with a safety valve 27, and when the pressure in the pressure vessel 2 reaches the design upper limit, the pressure is automatically released.
Referring to fig. 2, in one embodiment, a water softener 8 and a water storage tank 9 are further disposed upstream of the steam generator 1, the water storage tank 9 is disposed between the water softener 8 and the steam generator 1, and a water inlet end of the water softener 8 is connected to a tap water pipeline. After the water softener 8 softens tap water, the scaling of the pipeline of the steam generator 1 can be greatly reduced. In addition, the water vapor formed by the softened tap water contains less impurities, so that the impurities attached to the activated carbon can be reduced, and the service life of the activated carbon can be prolonged.
Referring to fig. 2, preferably, the steam generator 1 is connected to a natural gas pipeline 10, and heats by burning natural gas, so that the efficiency is high and the cost is low. The invention has low operation cost, the energy cost required for desorbing one piece of activated carbon (the specification is 100mm multiplied by 100 mm) only needs 5 minutes according to the prior energy price, and the energy cost consumed for the prior hot air online desorption needs more than 1.5 yuan.
The invention is illustrated in one step by the following exemplary examples and comparative examples:
example 1
An activated carbon desorption method comprises the following steps:
s01, sending the activated carbon adsorbed with the volatile organic compounds into a pressure container, closing an exhaust port and a water outlet of the pressure container, starting a steam generator, introducing steam for heating and pressurizing, starting timing when the pressure in the pressure container reaches over 0.7MPa and the temperature reaches over 150 ℃, and maintaining the pressure for 30 minutes, wherein during pressure maintaining, the temperature in the pressure container is controlled to be not higher than 160 ℃;
s02, closing an air inlet and a steam generator;
s03, after the pressure container is naturally cooled for 5 minutes, starting a primary heat exchange device, a secondary heat exchange device and a vacuum pump, opening an exhaust port, and after 5 minutes of exhaust, opening a water outlet;
and S04, continuously starting the vacuum pump to form negative pressure in the pressure container, and finishing the desorption of the activated carbon when the temperature in the pressure container is reduced to be below 50 ℃.
Comparative example 1
An activated carbon desorption method comprises the following steps:
and (3) sending the activated carbon adsorbed with the volatile organic compounds into a desorption container, starting a steam generator, continuously blowing off the activated carbon by adopting water vapor with the temperature of 150 ℃, wherein the blowing-off time is 30 minutes, and naturally drying after blowing-off.
Comparative example 2
An activated carbon desorption method comprises the following steps:
and (3) feeding the activated carbon adsorbed with the volatile organic compounds into a desorption container, and carrying out stripping by adopting hot air, wherein the initial temperature of the hot air is 90 ℃, the desorption temperature is controlled to be not higher than 130 ℃, and the stripping time is 30 minutes.
The utilizability of the activated carbon after the desorption in example 1, comparative example 1 and comparative example 2 was measured, respectively. The calculation method of the availability ratio comprises the following steps: the availability = n/the adsorption amount of the activated carbon without desorption treatment on the total volatile organic compounds, where n is the adsorption amount of the activated carbon after the n-th desorption on the total volatile organic compounds.
The corresponding assay results are as follows:
table one:
table one shows the availability of the desorbed activated carbon in example 1, and after 6 times of desorption, the availability of the activated carbon is still maintained at 0.98, which indicates that the present invention can effectively desorb the activated carbon, and no significant decrease in the availability after 6 times of desorption occurs.
A second table:
table two shows the availability of the desorbed activated carbon of comparative example 1, which is still 0.90 after 6 desorption cycles, but is inferior to example 1.
The invention reflects that the desorption rate of the active carbon can be effectively improved by adopting a reduced pressure desorption mode after the steam desorption, so that the desorption of the volatile organic compounds adsorbed in the active carbon is more thorough.
A third table:
table three shows the availability of the desorbed activated carbon of comparative example 2, and it can be seen from table three that the availability of comparative example 2 has been significantly reduced to only 0.53 after 6 times of desorption, which is far less than that of the present invention.
Referring to fig. 3, fig. 3 is a graph showing the effect of the desorbed activated carbon of the present invention, specifically, a content variation curve of TVOCs in the exhaust emission link of the painting workshop, which data is obtained by measuring with an on-line monitoring device. The dotted line in the figure shows that the TVOCs content is 50mg/m 3 Is indicated by the line(s). When the TVOCs content in the discharged amount is higher than the indication line, it is indicated that the activated carbon needs to be replaced. The first half part of the vertical boundary in the figure is the content of TVOCs in the discharge link after adsorption by activated carbon before desorption; the second half is discharged after being adsorbed by the desorbed active carbonTVOCs content in cyclic ring. In the figure, the adsorption effect of the activated carbon before desorption is not good because the activated carbon is used for a period of time, and although the activated carbon is subjected to adsorption treatment, the content of TVOCs in the exhaust gas exceeds the set value partially. The invention is used for the active carbon after desorption treatment and is reapplied, and the content of TVOCs in the exhaust gas is obviously reduced after adsorption treatment, which shows that the invention has good desorption effect on the active carbon, the utilization rate of the desorbed active carbon is high, and the invention still has good adsorption effect.
In conclusion, the active carbon desorption method and the active carbon desorption equipment provided by the invention can effectively desorb volatile organic compounds in the active carbon, greatly improve the desorption rate of the active carbon, greatly increase the usable times of the active carbon, and greatly reduce the operation cost of enterprises and the generation of solid wastes.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (1)
1. The activated carbon desorption method is characterized by comprising the following steps:
s01, feeding the activated carbon adsorbed with the volatile organic compounds into a pressure container, introducing water vapor into the pressure container, carrying out closed heating and pressurizing treatment on the activated carbon, maintaining the pressure in the pressure container, maintaining the temperature and the pressure for more than 30 minutes when the temperature in the pressure container reaches 150-160 ℃ and the pressure reaches more than 0.7MPa so as to desorb the volatile organic compounds in the activated carbon, and then stopping introducing the water vapor; the water vapor is formed by heating soft water by a steam generator;
s02, cooling, vacuumizing after pressure relief, and performing reduced pressure desorption to discharge volatile organic compounds to obtain desorbed active carbon;
the pressure container is a still kettle; the top of the pressure container is provided with an exhaust port, and the bottom of the pressure container is also provided with an air inlet and a water outlet; in the pressure relief, gas in the pressure container is discharged firstly, and then accumulated water in the pressure container is discharged;
the decompression desorption comprises the following steps: forming a negative pressure state in the pressure container by vacuumizing so as to enable a small amount of accumulated water and residual volatile organic compounds in the pressure container to form flash evaporation; when the temperature in the pressure container is reduced to below 50 ℃, the desorption of the activated carbon is completed.
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| CN104958993A (en) * | 2015-06-23 | 2015-10-07 | 江苏中远环保科技有限公司 | Novel desorption regeneration process and device using granular active carbon adsorption and vapor indirect heating |
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