CN215539629U - Industrial organic waste gas treatment system - Google Patents
Industrial organic waste gas treatment system Download PDFInfo
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- CN215539629U CN215539629U CN202121889497.9U CN202121889497U CN215539629U CN 215539629 U CN215539629 U CN 215539629U CN 202121889497 U CN202121889497 U CN 202121889497U CN 215539629 U CN215539629 U CN 215539629U
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Abstract
The utility model relates to an industrial organic waste gas treatment system. This treatment system includes: a pretreatment device; an extraction device; the extraction device is arranged between the extraction device and the activated carbon adsorption device, so that the precooled organic waste gas can be guided into the activated carbon adsorption device, and the solvent in the organic waste gas is adsorbed by the activated carbon adsorption device; the desorption device is communicated with the activated carbon adsorption device and is used for introducing high-temperature inert gas into the activated carbon adsorption device so as to desorb the solvent adhered to the activated carbon adsorption device; one end of the dehydration device is communicated with the active carbon adsorption device; the other end of the dehydration device is communicated with the desorption device to recover the cooled inert gas; and the rectifying device is used for rectifying and purifying the organic waste gas after water removal. Therefore, the organic waste gas can be scientifically and effectively treated, and secondary pollution in the treatment process is prevented.
Description
Technical Field
The utility model relates to the technical field of organic waste gas treatment, in particular to an industrial organic waste gas treatment system.
Background
The organic waste gas treatment means that various technical measures are used to eliminate organic waste gas pollution by reducing petroleum loss, reducing the use amount of organic solvent or exhaust purification through different ways. The organic waste gas pollution source is widely distributed. In order to prevent pollution, besides reducing petroleum loss and reducing the use amount of organic solvents to reduce the generation and emission of organic waste gas, exhaust purification is a feasible treatment way.
At present, the treatment process of organic waste gas mainly comprises a solvent recovery technology and a thermal oxidation decomposition technology.
Solvent recovery refers to the treatment of organic waste gases by adsorption, absorption, condensation and membrane separation techniques, thereby eliminating or reducing the organic waste gases. In the traditional solvent recovery process, waste water containing organic solvent is generated during pre-cooling, so that water pollution is caused. In addition, the condensed solvent has no subsequent rectification separation process, and the mixture cannot be directly reused, so that the economic value of the crude solvent is low correspondingly.
The principle of the Thermal oxidation decomposition technology, namely, the Regenerative Thermal Oxidizer (RTO) decomposition technology, is to oxidize organic matters (VOCs) in the exhaust gas into corresponding carbon dioxide and water at high temperature, thereby purifying the exhaust gas and recovering the heat released during the decomposition of the exhaust gas.
At present, the solvent recovery technology is mostly adopted in China to treat the organic waste gas. When high-temperature steam is used for desorption, the mixed waste gas of the steam severely corrodes equipment at high temperature. Meanwhile, the desorption of water vapor can lead to the shortening of the service life of the adsorbent (activated carbon), and when the adsorbent is replaced, waste activated carbon is generated, and the pollutant-containing components are more. In addition, the drying is not carried out or is not thorough after the water vapor desorption, the adsorption efficiency of the activated carbon is reduced, and the service life is prolonged. And part of active substances containing ketone and the like can react with the active carbon or the surface of the active carbon, so that the blockage or the over-high heat accumulation is caused, the fire is easy to catch fire, and certain potential safety hazards exist.
The prior art is difficult to carry out scientific and effective treatment to organic waste gas to cause secondary pollution easily in the treatment process, still need to provide a more reasonable technical scheme to this, in order to solve above-mentioned technical problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an industrial organic waste gas treatment system, which is used for scientifically and effectively treating organic waste gas and preventing secondary pollution in the treatment process.
In order to achieve the above object, the present invention provides an industrial organic waste gas treatment system, comprising:
the pretreatment device is used for carrying out rough filtration and precooling treatment on the organic waste gas;
the extraction device is used for introducing the organic waste gas after rough filtration and precooling;
the extraction device is arranged between the extraction device and the activated carbon adsorption device and is respectively communicated with the extraction device and the activated carbon adsorption device so as to introduce the precooled organic waste gas into the activated carbon adsorption device and adsorb a solvent in the organic waste gas through the activated carbon adsorption device;
the desorption device is communicated with the activated carbon adsorption device and is used for introducing high-temperature inert gas into the activated carbon adsorption device so as to desorb the solvent adhered to the activated carbon adsorption device;
one end of the dehydration device is communicated with the activated carbon adsorption device and is used for cooling and dehydrating the desorbed organic waste gas to obtain a crude solvent; the other end of the dehydration device is communicated with the desorption device so as to recover the cooled inert gas; and
and the rectifying device is used for rectifying and purifying the organic waste gas after water removal.
In one possible design, the pretreatment device comprises a cooling tower and a filter, one end of the filter is provided with an exhaust gas inlet, and the other end of the filter is communicated with the extraction device; the cooling tower is provided with a lead-in pipe for leading in a refrigerant and a lead-out pipe for recovering the refrigerant, and the lead-in pipe and the lead-out pipe are respectively communicated with the filter to form a passage for the circulation of the refrigerant.
In one possible design, the filter includes a sleeve for cooling the organic waste gas and a filter assembly for filtering the organic waste gas, the sleeve is formed with a cooling cavity for accommodating a refrigerant, and the cooling cavity is respectively communicated with the inlet pipe and the outlet pipe; the filter assembly is disposed in the sleeve.
In one possible design, the extraction device comprises an exhaust fan, a regulating valve, a controller and a detector, the detector is used for detecting the air intake in the pipeline, and the controller is respectively in communication connection with the detector, the exhaust fan and the regulating valve so as to regulate the motion state of the exhaust fan and the opening and closing state of the regulating valve according to the current air intake.
In one possible design, the desorption device includes a nitrogen generator, a heater, and a regeneration fan disposed in the nitrogen generator and the heater to enable introduction of nitrogen gas into the heater and introduction of heated high-temperature nitrogen gas into the activated carbon adsorption device to desorb a solvent adhered to the activated carbon adsorption device.
In one possible design, the heater is a heat conducting oil heating mechanism.
In one possible design, the dehydration device comprises a heat exchange mechanism, a crude solvent transfer tank and a molecular sieve dehydration mechanism, wherein one end of the crude solvent transfer tank is communicated with the heat exchange mechanism, and the other end of the crude solvent transfer tank is communicated with the molecular sieve dehydration mechanism.
In one possible design, the heat exchange mechanism comprises a precooling heat exchanger and a cryogenic heat exchanger, one end of the precooling heat exchanger is communicated with the activated carbon adsorption device, and the other end of the precooling heat exchanger is communicated with the cryogenic heat exchanger; the cryogenic heat exchanger is respectively communicated with the molecular sieve dehydration mechanism and the desorption device.
In a possible design, the heat exchange mechanism further comprises a water chiller, the water chiller is arranged between the precooling heat exchanger and the copious cooling heat exchanger, and is respectively communicated with the precooling heat exchanger and the copious cooling heat exchanger.
In one possible embodiment, the rectification apparatus comprises a plurality of rectification columns, wherein the plurality of rectification columns are arranged in the order of boiling point of the organic substance to be purified from low to high.
Through the technical scheme, the treatment method can be used for extracting the organic waste gas filled with the solvent from the production line, and the waste gas is filtered, cooled to a proper temperature and then introduced into the activated carbon adsorption tank. Here, the solvent (organic waste gas component) is adsorbed onto activated carbon in an activated carbon adsorption tank, whereby separation of the solvent and air is achieved, after which the cleaned air is discharged into the atmosphere through a stack, thereby meeting ultra-low emission requirements (30 mg/m)3)。
Inert gases (e.g. N) are selected which do not react with the organic waste gases2) As a desorption agent, the secondary pollution of the traditional steam desorption-solvent recovery technology can be avoided. And the desorbed gas can be recycled, the service life of the activated carbon is prolonged, no special corrosion is caused to environment-friendly equipment in the process, and the manufacturing cost is effectively reduced.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a process flow diagram of an industrial organic waste gas treatment system provided by the present disclosure, wherein the thick arrows indicate the gas flow direction of the organic waste gas during the adsorption process;
fig. 2 is a process flow diagram of an industrial organic waste gas treatment system provided by the present disclosure, and a thick arrow indicates a gas flow direction of an organic waste gas in a desorption process;
FIG. 3 is a process flow diagram of an industrial organic waste gas treatment system provided by the present disclosure, wherein the thick arrows indicate the gas flow direction of the organic waste gas during the condensation dehydration process;
FIG. 4 is a process flow diagram of a rectification device of an industrial organic waste gas treatment system provided by the present disclosure.
Description of the reference numerals
11-a cooling tower, 12-a filter, 2-an extraction device, 3-an activated carbon adsorption device, 41-a nitrogen generator, 42-a heater, 43-a regeneration fan, 51-a precooling heat exchanger, 52-a cryogenic heat exchanger, 53-an ice water machine, 54-a crude solvent transfer tank, 55-a molecular sieve dehydration mechanism, 6-a rectification device and 7-a chimney.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
According to a first aspect of the present disclosure, a method for treating industrial organic waste gas is provided, and fig. 1 to 4 show one embodiment of the method.
The industrial organic waste gas treatment method comprises the following steps: extracting organic waste gas, and filtering and cooling the organic waste gas; introducing the organic waste gas obtained in the step into an activated carbon adsorption tank for adsorption treatment to obtain cleaned gas; introducing inert gas into the activated carbon adsorption tank to perform desorption treatment on the organic solvent adhered to the activated carbon adsorption tank to obtain mixed gas containing the inert gas and the organic solvent; dehydrating the mixed gas to obtain a dehydrated crude solvent; rectifying and purifying the crude solvent.
In this way, the solvent-laden organic waste gas from the production line can be extracted, filtered, cooled to an appropriate temperature, and introduced into the activated carbon adsorption tank. Here, the solvent (organic waste gas component) is adsorbed onto the activated carbon in the activated carbon adsorption tank, thereby achieving separation of the solvent and air, which isThen the cleaned air is discharged into the atmosphere through a chimney 7, thereby meeting the requirement of ultra-low emission (30 mg/m)3)。
Meanwhile, when the activated carbon adsorption tank adsorbs the solvent for a period of time, the adsorption amount of the activated carbon reaches the maximum value, the solvent can not be adsorbed any more, and if the activated carbon adsorption tank needs to be used continuously, the solvent needs to be regenerated. In this case, since the activated carbon adsorption tank to be regenerated contains oxygen, this oxygen must be removed before the concentration of the volatile solvent reaches a high concentration and approaches the LEL (minimum explosion limit). Therefore, inert gas can be introduced into the activated carbon adsorption tank, so that the oxygen concentration is reduced (the oxygen concentration can be kept at 2-3%), and the explosion risk is greatly reduced.
When the oxygen content reaches a minimum value, the inert gas may be heated to 200 ℃ and introduced into the activated carbon adsorption tank, and the high-temperature inert gas is passed through the activated carbon bed, so that the carbon bed releases moisture and the adsorbed solvent, resulting in a mixed gas containing the inert gas and the organic solvent (hereinafter referred to as a regeneration gas). Thereafter, these regeneration gases are subjected to a water removal treatment to remove the remaining water while retaining the solvent (i.e., wool solvent). Wherein most of water in the regeneration gas is collected into the process water pool after being condensed, is treated again through an external atomization system or an evaporation device and then is sent into the organic waste gas inlet pipeline. The remained crude solvent can be rectified and purified to obtain corresponding organic substances.
By using the above treatment method, inert gas (such as N) which does not react with the organic waste gas is selected2) As a desorption agent, the secondary pollution of the traditional steam desorption-solvent recovery technology can be avoided. And the desorbed gas can be recycled, the service life of the activated carbon is prolonged, no special corrosion is caused to environment-friendly equipment in the process, and the manufacturing cost is effectively reduced.
The treatment method of the mixed gas containing the inert gas and the organic solvent is carried out in two stages because the regeneration time of the two types of compounds is set differently and partially overlapped. The first stage is mainly condensation of moisture, and the present disclosure may condense moisture after heat exchange by a cooling vessel (e.g., using pre-cooling heat exchanger 51, water chiller 53, and cryogenic heat exchanger 52), thereby increasing the content of organic solvent in the regeneration gas, after which the mixed gas may be subjected to the second stage of treatment. In the second stage, the water content decreases (the concentration of the solvent is monitored by a hydrogen flame ionization detector, FID, continuous analyzer) as the content of organic solvent increases, so that the regeneration gas can be fed into the molecular sieve loop to remove the remaining water and retain the solvent.
Most of the water in the regeneration gas can be condensed by, for example, a precooling heat exchanger 51, an ice water machine 53 or a cryogenic heat exchanger 52, and then the condensed water is gathered into a process water pool, sent into an adsorption waste gas main pipe through an atomization system or an evaporation device, and then introduced into an activated carbon adsorption tank again for treatment.
In one embodiment, the dehydration treatment can be performed by a dehydration device composed of a heat exchanger and a molecular sieve, and the water content in the regeneration raw material gas can be only 0.05%. And if no molecular sieve is present, the water content is about 1-1.5%. The gas phase molecular sieve is selected to avoid the risk of corrosion that may exist in liquid phase molecular sieve equipment, which corrosion may be due to the higher acetic acid production during regeneration of the liquid phase molecular sieve.
When the solvent concentration in the regeneration gas reaches a minimum, the solvent is condensed in another heat exchanger after dehydration by molecular sieves. The recovered solvent is stored in a suitable process tank. The condensation phase ends when the carbon bed is completely free of solvent. The regeneration gas is cooled by the water chiller 53, thereby cooling the activated carbon bed.
In one embodiment, the high temperature inert gas temperature is 195 ℃ to 205 ℃. Preferably, the high temperature inert gas temperature is 200 ℃.
In one embodiment, the inert gas is nitrogen. In yet other embodiments, the inert gas may also be a naturally occurring noble gas, such as any suitable gas, for example, helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe).
In an exemplary embodiment, the pressure during rectification and purification is 0.45-0.55 MPa, so that the organic solvent can be purified and separated well. Specifically, the pressure may be set to 0.5 MPa.
In the activated carbon adsorption tank, adopt hydrogen flame ionization detector to detect the concentration of organic solvent, adopt oxygen sensor to detect oxygen concentration to in time control inert gas's leading-in moment and duration under the different temperatures, in order to guarantee the desorption effect to activated carbon.
In one embodiment, the activated carbon adsorption tanks are configured into at least two groups, and each group of activated carbon adsorption tanks are arranged in parallel, so that the adsorption efficiency and the adsorption effect on the organic waste gas can be ensured. In the present disclosure, the activated carbon adsorption tanks are configured into three groups arranged in parallel, and for the specification and the number of the activated carbon adsorption tanks, those skilled in the art can flexibly configure the activated carbon adsorption tanks according to the application environment and the treatment requirement.
Referring to fig. 1 to 3, in the present disclosure, an exhaust fan is used to extract organic waste gas, thereby enabling the organic waste gas to be smoothly introduced into an activated carbon adsorption tank. In addition, adopt cooling tower 11 to introduce the cold source and cool off organic waste gas to guarantee the adsorption effect of organic waste gas in the active carbon adsorption tank in later stage.
In the present disclosure, the crude solvent is purified respectively by using a plurality of distillation columns, wherein the distillation columns are arranged in the order of the boiling point of the organic substance to be purified from low to high. Therefore, the crude solvent with simple component composition can be rectified, separated and purified, and then the high-purity single-component solvent is obtained, so that the economic value is huge, and the equipment cost can be quickly recovered.
The crude solvent is a mixture of ethyl acetate, n-propyl ester, a high boiling point substance and water. Since this mixture cannot be directly reused, impurities must be removed by means of a rectification unit, whereby a single-component solvent of high purity is obtained, in order to be able to be put into use again.
In the present disclosure, three rectification columns are employed and the recovered crude solvent is a mixture of ethyl acetate, n-propyl ester, high boiling point material and water. This mixture cannot be directly reused and must be passed through a rectification unit to remove impurities.
The first rectifying column is intended to separate high boiling point materials including toluene, such as acetic acid, retarder and impurities, and to discharge them through the bottom of the column. Low-boiling mixtures (n-propyl ester and water) are obtained from the top of the first rectification column and are sent to the second rectification column. The purpose of the second rectification column is to separate the n-propyl ester from water, to obtain pure propyl ester at the bottom and water and an azeotrope with n-propyl ester (REC-S2b) at the top. The third rectifying tower separates pure ethyl acetate (REC-S3a) from high boiling point material, n-propyl ester.
According to a second aspect of the present disclosure, an industrial organic exhaust gas treatment system is provided, embodiments of which are shown in fig. 1 to 4.
This industry organic waste gas treatment system includes preprocessing device, extraction element 2, active carbon adsorption device 3, desorption device, dewatering device and rectifier unit 6. The pretreatment device is used for carrying out rough filtration and precooling treatment on the organic waste gas; the extraction device 2 is used for introducing the organic waste gas after rough filtration and precooling; the activated carbon adsorption device 3 is communicated with the chimney 7, wherein the extraction device 2 is arranged between the extraction device 2 and the activated carbon adsorption device 3 and is respectively communicated with the extraction device 2 and the activated carbon adsorption device 3, so that precooled organic waste gas can be introduced into the activated carbon adsorption device 3, and a solvent in the organic waste gas can be adsorbed by the activated carbon adsorption device 3; the desorption device is communicated with the activated carbon adsorption device 3 and is used for introducing high-temperature inert gas into the activated carbon adsorption device 3 so as to desorb the solvent adhered to the activated carbon adsorption device 3; one end of the dehydration device is communicated with the activated carbon adsorption device 3 and is used for cooling and dehydrating the desorbed organic waste gas to obtain a crude solvent; the other end of the dehydration device is communicated with the desorption device to recover the cooled inert gas; the rectifying device 6 is used for rectifying and purifying the organic waste gas after water removal.
Through above-mentioned technical scheme, can draw the organic waste gas that is full of the solvent that comes from the production line through extraction element 2, and organic waste gas can be introduced into the active carbon adsorption tank after filtering, cooling to suitable temperature. In the cooled organic waste gas, the solvent (organic waste gas component) can be adsorbed to the activity in the activated carbon adsorption tankOn charcoal, thereby effecting separation of the solvent and air. The cleaned air is then discharged to the atmosphere via a stack 7, thereby meeting ultra-low emission requirements (30 mg/m)3)。
And the pretreated waste gas enters an adsorption tank, the organic solvent in the waste gas is attached to the activated carbon, and the more the organic solvent in the tank is accumulated along with the prolonging of the adsorption time. Meanwhile, because the volume of the adsorption tank is limited, air or oxygen is mixed in the waste gas, and the mixed gas in the tank is often within the explosion limit range of the combustible materials or higher than the explosion upper limit (combustible) of the combustible materials. In this case, since the activated carbon adsorption tank to be regenerated contains oxygen, this oxygen must be removed before the concentration of the volatile solvent reaches a high concentration and approaches the LEL (minimum explosion limit). Therefore, inert gas can be introduced into the activated carbon adsorption tank, so that the oxygen concentration is reduced (the oxygen concentration can be kept at 2-3%), and the explosion risk is greatly reduced.
When the activated carbon adsorption tank adsorbs the solvent for a period of time, the adsorption quantity of the activated carbon reaches the maximum value, the solvent can not be adsorbed, and if the activated carbon adsorption tank needs to be continuously used, the activated carbon adsorption tank needs to be regenerated to help the carbon bed to recover the adsorption performance. When the oxygen content reaches a minimum value, the inert gas may be heated to 200 ℃ and introduced into the activated carbon adsorption tank, and the high-temperature inert gas is passed through the activated carbon bed, so that the carbon bed releases moisture and the adsorbed solvent, resulting in a mixed gas containing the inert gas and the organic solvent (hereinafter referred to as a regeneration gas).
Thereafter, these regeneration gases are introduced into a dehydration apparatus to be subjected to a water removal treatment so that the remaining water can be removed while retaining the solvent (i.e., the hair solvent). Wherein most of water in the regeneration gas is collected into the process water pool after being condensed, is treated again through an external atomization system or an evaporation device and then is sent into the organic waste gas inlet pipeline. The remained crude solvent can be purified and separated by the rectifying device 6 to obtain organic substances with single component.
By using the above treatment method, inert gas (such as N) which does not react with the organic waste gas is selected2) As a desorption agent, the secondary pollution of the traditional steam desorption-solvent recovery technology can be avoided. And after detachmentThe gas can be recycled, the service life of the activated carbon is prolonged, no special corrosion is caused to the environment-friendly equipment in the process, and the manufacturing cost is effectively reduced.
In the present invention, the terms of orientation such as "upper, lower, left, right" are used to refer to the upper and lower sides of the industrial organic waste gas treatment system provided by the present disclosure under normal use conditions, unless otherwise specified. The inner and outer parts refer to the inner and outer parts of the contour of the part. "far and near" refers to a positional relationship, and does not mean a physical quantity at an actual distance.
In one embodiment, the pretreatment device comprises a cooling tower 11 and a filter 12, one end of the filter 12 is provided as an exhaust gas inlet, and the other end is communicated with the extraction device 2; the cooling tower 11 is provided with an inlet pipe for introducing a refrigerant and an outlet pipe for recovering the refrigerant, and the inlet pipe and the outlet pipe are respectively communicated with the filter 12 to form a passage for the circulation of the refrigerant, thereby helping the organic waste gas to be cooled, and enabling the activated carbon adsorption device 3 to quickly and effectively adsorb the solvent in the organic waste gas.
Specifically, the filter 12 includes a sleeve for cooling the organic waste gas and a filter assembly for filtering the organic waste gas, the sleeve forms a cooling cavity for accommodating a refrigerant, and the cooling cavity is respectively communicated with the inlet pipe and the outlet pipe, so as to cool the organic waste gas flowing through the sleeve; the filtering component is arranged in the sleeve to carry out rough filtering on the organic waste gas.
It should be noted that the cooling tower 11 used in the present disclosure may be modified from existing cooling equipment. The filter component can be flexibly selected from the existing filters, filter screens or filter plates.
In one embodiment of the disclosed system, the extraction device 2 comprises a suction fan, a regulating valve, a controller and a detector, the detector is used for detecting the intake air rate in the pipeline, and the controller is respectively connected with the detector, the suction fan and the regulating valve in a communication mode to adjust the motion state of the suction fan and the opening and closing state of the regulating valve according to the current intake air rate, so that the accurate control of the flow rate and the flow rate of the introduced organic waste gas is realized. Wherein, the detector is a wind speed and wind pressure measuring instrument. The controller is a PLC programmable logic controller.
In addition, the exhaust fan and the regulating valve used can be obtained by conventional improvement based on the prior art, and therefore, the detailed description is omitted.
In one embodiment, the desorption device includes a nitrogen generator 41, a heater 42, and a regeneration fan 43, and the regeneration fan 43 is disposed at the nitrogen generator 41 and the heater 42 to enable introduction of nitrogen gas to the heater 42 and introduction of high-temperature nitrogen gas to the activated carbon adsorption device 3 to desorb the solvent adhered to the activated carbon adsorption device 3.
Thus, after the carbon bed is saturated in adsorption, high-temperature nitrogen is needed for desorption, so that the carbon bed can recover the adsorption performance. The nitrogen is introduced to replace the air in the carbon bed, so that the oxygen concentration is reduced, the carbon bed does not have a combustion and explosion condition, and the safety in the desorption process is ensured.
In the present disclosure, the heater 42 is a heat-conducting oil heating mechanism, so that nitrogen is heated by the heat-conducting oil to ensure the desorption effect on the carbon bed.
It should be noted that the nitrogen generator is a commercially available product, and therefore, will not be described in detail here. The regenerative fan 43 is a fan commonly used in the field of exhaust gas treatment.
In the present disclosure, the dehydration device includes a heat exchange mechanism, a crude solvent transfer tank 54 and a molecular sieve dehydration mechanism 55, wherein one end of the crude solvent transfer tank 54 is communicated with the heat exchange mechanism, and the other end is communicated with the molecular sieve dehydration mechanism 55. The dehydration device composed of the heat exchange mechanism and the molecular sieve dehydration mechanism 55 is adopted for dehydration treatment, so that the water content in the regeneration raw material gas is only 0.05 percent. And if no molecular sieve is present, the water content is about 1-1.5%. Therefore, this arrangement can improve the effect of removing water.
In the present disclosure, the molecular sieve dehydration mechanism 55 includes a gas-phase molecular sieve and a liquid-phase molecular sieve, thereby ensuring the dehydration effect. Because the generation amount of acetic acid is high in the regeneration process of the liquid-phase molecular sieve, the gas-phase molecular sieve is added, and the corrosion risk possibly existing in liquid-phase molecular sieve equipment can be effectively avoided.
In the present disclosure, the heat exchange mechanism includes a precooling heat exchanger 51 and a cryogenic heat exchanger 52, one end of the precooling heat exchanger 51 is communicated with the activated carbon adsorption device 3, and the other end is communicated with the cryogenic heat exchanger 52; the cryogenic heat exchanger 52 is respectively communicated with the molecular sieve dehydration mechanism 55 and the desorption device, so that the regenerated gas is cooled in such a way, the water vapor is solidified, and the dehydration effect is ensured.
Further, the heat exchange mechanism further comprises an ice water machine 53, and the ice water machine 53 is arranged between the pre-cooling heat exchanger 51 and the cryogenic heat exchanger 52 and is respectively communicated with the pre-cooling heat exchanger 51 and the cryogenic heat exchanger 52. The water chiller 53, i.e., a water chiller, is a machine that outputs low-temperature chilled water, and can be divided into a normal temperature type and a low temperature type according to the temperature of the output cold water, the temperature of the normal temperature type cold water can be adjusted between 3 and 35 ℃, and the low temperature type cold water can output cold water at a temperature below zero. By the arrangement, the water vapor can be quickly solidified, and the dehydration effect is ensured.
In one embodiment, the rectification mechanism comprises a plurality of rectification towers, wherein the plurality of rectification towers are arranged in the order of the boiling point of the organic substance to be purified from low to high.
In the present disclosure, the crude solvent is purified respectively by using a plurality of distillation columns, wherein the distillation columns are arranged in the order of the boiling point of the organic substance to be purified from low to high. Therefore, a rectifying tower is added to separate the organic solvent on the basis of the traditional water vapor desorption-solvent recovery technology, the crude solvent with simple component composition can be rectified, separated and purified, and then the high-purity single-component solvent is obtained, so that the economic value is huge, and the equipment cost can be quickly recovered.
The crude solvent is a mixture of ethyl acetate, n-propyl ester, a high boiling point substance and water. Because the mixture can not be directly reused, the organic solvent can be recycled by removing impurities through the rectification unit.
In the present disclosure, three rectification columns are employed and the recovered crude solvent is a mixture of ethyl acetate, n-propyl ester, high boiling point material and water. This mixture cannot be directly reused and must be passed through a rectification unit to remove impurities.
The first rectifying column is intended to separate high boiling point materials including toluene, such as acetic acid, retarder and impurities, and to discharge them through the bottom of the column. Low-boiling mixtures (n-propyl ester and water) are obtained from the top of the first rectification column and are sent to the second rectification column. The purpose of the second rectification column is to separate the n-propyl ester from water, to obtain pure propyl ester at the bottom and water and an azeotrope with n-propyl ester (REC-S2b) at the top. The third rectifying tower separates pure ethyl acetate (REC-S3a) from high boiling point material, n-propyl ester.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
Claims (10)
1. An industrial organic waste gas treatment system, comprising:
the pretreatment device is used for carrying out rough filtration and precooling treatment on the organic waste gas;
the extraction device (2) is used for introducing the organic waste gas after rough filtration and precooling;
the extraction device (2) is arranged between the extraction device (2) and the activated carbon adsorption device (3) and is respectively communicated with the extraction device (2) and the activated carbon adsorption device (3) so as to guide the precooled organic waste gas into the activated carbon adsorption device (3) and adsorb a solvent in the organic waste gas through the activated carbon adsorption device (3);
the desorption device is communicated with the activated carbon adsorption device (3) and is used for introducing high-temperature inert gas into the activated carbon adsorption device (3) so as to desorb the solvent adhered to the activated carbon adsorption device (3);
one end of the dehydration device is communicated with the activated carbon adsorption device (3) and is used for cooling and dehydrating the desorbed organic waste gas to obtain a crude solvent; the other end of the dehydration device is communicated with the desorption device so as to recover the cooled inert gas; and
and the rectifying device (6) is used for rectifying and purifying the organic waste gas after water removal.
2. The industrial organic exhaust gas treatment system according to claim 1, wherein the pretreatment device comprises a cooling tower (11) and a filter (12), one end of the filter (12) is provided as an exhaust gas inlet, and the other end of the filter is communicated with the extraction device (2); the cooling tower (11) is provided with a lead-in pipe for leading in a refrigerant and a lead-out pipe for recovering the refrigerant, and the lead-in pipe and the lead-out pipe are respectively communicated with the filter (12) to form a passage for the circulation of the refrigerant.
3. The industrial organic waste gas treatment system according to claim 2, wherein the filter (12) comprises a sleeve for cooling the organic waste gas and a filter assembly for filtering the organic waste gas, the sleeve is formed with a cooling cavity for accommodating a refrigerant, and the cooling cavity is respectively communicated with the inlet pipe and the outlet pipe; the filter assembly is disposed in the sleeve.
4. The industrial organic exhaust gas treatment system according to claim 1, wherein the extraction device (2) comprises a suction fan, a regulating valve, a controller and a detector, the detector is used for detecting the intake air rate in the pipeline, and the controller is respectively connected with the detector, the suction fan and the regulating valve in a communication mode so as to regulate the motion state of the suction fan and the opening and closing state of the regulating valve according to the current intake air rate.
5. The industrial organic exhaust gas treatment system according to claim 1, wherein the desorption device comprises a nitrogen generator (41), a heater (42), and a regeneration fan (43), and the regeneration fan (43) is disposed at the nitrogen generator (41) and the heater (42) to enable introduction of nitrogen gas to the heater (42) and introduction of heated high-temperature nitrogen gas to the activated carbon adsorption device (3) to desorb the solvent adhered to the activated carbon adsorption device (3).
6. The industrial organic waste gas treatment system according to claim 5, wherein the heater (42) is a heat conducting oil heating mechanism.
7. The industrial organic waste gas treatment system according to claim 1, wherein the dehydration device comprises a heat exchange mechanism, a crude solvent transfer tank (54) and a molecular sieve dehydration mechanism (55), one end of the crude solvent transfer tank (54) is communicated with the heat exchange mechanism, and the other end is communicated with the molecular sieve dehydration mechanism (55).
8. The industrial organic waste gas treatment system according to claim 7, wherein the heat exchange mechanism comprises a pre-cooling heat exchanger (51) and a cryogenic heat exchanger (52), one end of the pre-cooling heat exchanger (51) is communicated with the activated carbon adsorption device (3), and the other end of the pre-cooling heat exchanger is communicated with the cryogenic heat exchanger (52); the cryogenic heat exchanger (52) is respectively communicated with the molecular sieve dehydration mechanism (55) and the desorption device.
9. The industrial organic waste gas treatment system according to claim 8, wherein the heat exchange mechanism further comprises a water chiller (53), and the water chiller (53) is disposed between the pre-cooling heat exchanger (51) and the cryogenic heat exchanger (52) and is respectively communicated with the pre-cooling heat exchanger (51) and the cryogenic heat exchanger (52).
10. The industrial organic waste gas treatment system according to claim 1, wherein the rectifying device (6) comprises a plurality of rectifying towers, wherein the plurality of rectifying towers are arranged in the order of the boiling point of the organic substance to be purified from low to high.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768469A (en) * | 2022-05-23 | 2022-07-22 | 北人伯乐氛(西安)环境技术有限公司 | Organic waste gas solvent recovery process |
| CN114931841A (en) * | 2022-05-23 | 2022-08-23 | 北人伯乐氛(西安)环境技术有限公司 | Organic waste gas desorption treatment device and desorption method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768469A (en) * | 2022-05-23 | 2022-07-22 | 北人伯乐氛(西安)环境技术有限公司 | Organic waste gas solvent recovery process |
| CN114931841A (en) * | 2022-05-23 | 2022-08-23 | 北人伯乐氛(西安)环境技术有限公司 | Organic waste gas desorption treatment device and desorption method |
| CN114768469B (en) * | 2022-05-23 | 2024-04-12 | 北人伯乐氛(西安)环境技术有限公司 | Organic waste gas solvent recovery process |
| CN114931841B (en) * | 2022-05-23 | 2024-04-16 | 北人伯乐氛(西安)环境技术有限公司 | Organic waste gas desorption treatment device and desorption method |
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