CN213761193U - VOCs recovery system - Google Patents
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- CN213761193U CN213761193U CN202022559153.3U CN202022559153U CN213761193U CN 213761193 U CN213761193 U CN 213761193U CN 202022559153 U CN202022559153 U CN 202022559153U CN 213761193 U CN213761193 U CN 213761193U
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- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
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Abstract
The utility model discloses a VOCs recovery system, VOCs recovery system include low temperature absorption unit, vacuum desorption unit, absorption liquid backward flow unit, low temperature condensation recovery unit and adsorption unit, and low temperature absorption unit is used for absorbing VOCs in the VOCs gas of coming at low temperature in order to obtain poor grade VOCs gas, and poor grade absorption liquid in the low temperature absorption unit becomes rich grade absorption liquid after absorbing VOCs; the vacuum desorption unit is connected with the low-temperature absorption unit and is used for carrying out high-temperature vacuum desorption on the rich-grade absorption liquid to desorb gaseous VOCs, and the rich-grade absorption liquid is desorbed to give gaseous VOCs and then becomes lean-grade absorption liquid; the absorption liquid reflux unit is connected with the vacuum desorption unit and is used for cooling the lean absorption liquid discharged by the vacuum desorption unit and returning the cooled lean absorption liquid to the low-temperature absorption unit; the low-temperature condensation recovery unit is connected with the vacuum desorption unit; the adsorption unit is connected with the low-temperature absorption unit. The utility model discloses can realize low concentration VOCs's high-efficient recovery and ultralow emission well.
Description
Technical Field
The utility model relates to a VOCs recovery system.
Background
VOCs (volatile organic compounds) are key precursors for forming PM2.5 and ozone, have physiological toxicity and great harm to the environment and human health.The issuance and implementation of the new environmental protection law and the atmospheric pollution prevention law provide legal basis for the pollution prevention and treatment work of the VOCs, and require comprehensive control from the aspects of source control, clean production, emission management and the like. VOCs are also listed as the primary constraint index for "thirteen five" emissions reduction. In recent years, the treatment of the VOCs is more refined and normalized, and particularly, the treatment areas, means and the like are changed in 2020. However, since VOCs are volatile due to their wide source, the emission of VOCs can be caused by storage, transportation, mixing, stirring, cleaning, painting, drying, and other processing steps using VOCs-containing materials. For example, fossil fuels, solvent use, petrochemical, steel making and coking, etc. may emit large amounts of VOCs. Data measurement shows that the discharge amount of industrial VOCs in China reaches 2,113.4 ten thousand tons in 2020, so that the treatment of VOCs cannot be relaxed. VOCs remediation presents challenges to lower concentrations, lower total volumes, for the upcoming fourteen-five. Currently, methods for treating VOCs are largely classified into destructive and non-destructive methods. The destruction process includes combustion and catalytic oxidation to convert VOCs to CO2And H2O; the non-destructive methods mainly include condensation, absorption, adsorption and membrane separation. However, in practice, the single use of these methods has a series of problems, the recovery efficiency is low, and usually the method needs to be combined with other processes to achieve good separation efficiency. At present, the existing recovery system is difficult to realize high-efficiency recovery aiming at low-concentration VOCs.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art's defect, provide a VOCs recovery system, it can realize low concentration VOCs's high-efficient recovery and ultralow emission well.
In order to solve the technical problem, the technical scheme of the utility model is that: a system for recovering VOCs, comprising:
the low-temperature absorption unit is used for absorbing VOCs in the incoming VOCs at low temperature to obtain lean-grade VOCs gas, and lean-grade absorption liquid in the low-temperature absorption unit becomes rich-grade absorption liquid after absorbing the VOCs;
the vacuum desorption unit is connected with the low-temperature absorption unit and is used for carrying out high-temperature vacuum desorption on the rich-grade absorption liquid to desorb gaseous VOCs, and the rich-grade absorption liquid is desorbed from the gaseous VOCs and then becomes lean-grade absorption liquid;
the absorption liquid reflux unit is connected with the vacuum desorption unit and is used for cooling the lean absorption liquid discharged by the vacuum desorption unit and returning the cooled lean absorption liquid to the low-temperature absorption unit;
the low-temperature condensation recovery unit is connected with the vacuum desorption unit and is used for condensing and recovering the gaseous VOCs into liquid VOCs;
and the adsorption unit is connected with the low-temperature absorption unit and is used for adsorbing VOCs in the lean-grade VOCs gas to obtain gas meeting the emission standard.
In order to provide a heat source for the vacuum desorption unit through the low-temperature absorption unit and the absorption liquid recovery unit so as to realize heat recycling, the VOCs recovery system further comprises a heat pump system, wherein the cold end of the heat pump system is respectively connected with the low-temperature absorption unit and the absorption liquid reflux unit, and the hot end of the heat pump system is connected with the vacuum desorption unit so that heat flows to the vacuum desorption unit from the low-temperature absorption unit and the absorption liquid reflux unit.
Further to prevent VOCs from being incompletely recovered, the gas outlet end of the cryocondensation recovery unit is in communication with the gas inlet of the cryogenic absorption unit to return uncondensed gaseous VOCs to the cryogenic absorption unit.
Further provided is a concrete structure of a low temperature absorption unit, which includes:
an ejector having a gas inlet for receiving incoming gas of VOCs and an absorption liquid inlet end thereof communicating with an outlet end of the absorption liquid reflux unit;
the shell layer inlet end of the multifunctional low-temperature coupling absorption tank A is communicated with the outlet end of the ejector, the pipe layer of the multifunctional low-temperature coupling absorption tank A is connected with the cold end of the heat pump system, the shell layer outlet end of the multifunctional low-temperature coupling absorption tank A is communicated with the inlet end of the vacuum desorption unit, and the gas outlet end of the multifunctional low-temperature coupling absorption tank A is communicated with the adsorption unit.
There is further provided a concrete structure of a vacuum desorption unit including:
the absorption liquid inlet end of the vacuum desorption tower is communicated with the absorption liquid outlet end of the low-temperature absorption unit, the pipe layer of the vacuum desorption tower is connected with the hot end of the heat pump system, and the absorption liquid outlet end of the vacuum desorption tower is communicated with the absorption liquid reflux unit;
and the air inlet of the vacuum pump is communicated with the air outlet of the vacuum desorption tower, and the air outlet of the vacuum pump is communicated with the low-temperature condensation recovery unit.
Further provided is a concrete structure of an absorption liquid reflux unit, which includes:
the shell layer inlet end of the water-cooled heat exchanger is communicated with the absorption liquid outlet end of the vacuum desorption unit;
the shell layer inlet end of the multifunctional low-temperature coupling absorption tank B is communicated with the shell layer outlet end of the water-cooling heat exchanger, and the tube layer of the multifunctional low-temperature coupling absorption tank B is connected with the cold end of the heat pump system;
and the inlet of the pump body is communicated with the outlet end of the shell layer of the multifunctional low-temperature coupling absorption tank B, and the outlet of the pump body is communicated with the absorption liquid inlet end of the low-temperature absorption unit.
Further provided is a concrete structure of a low temperature condensation recovery unit, the low temperature condensation recovery unit comprising:
a condensing system in communication with the gas outlet of the vacuum desorption unit to condense gaseous VOCs entering therein to liquid VOCs;
a recovery tank in communication with the condensing system to recover liquid VOCs.
Further in order to prevent the high-temperature gaseous VOCs coming out of the vacuum desorption unit from damaging a condensation system, the low-temperature condensation recovery unit further comprises a heat exchange tank set used for pre-condensing the gaseous VOCs, the inlet end of the condensation system is communicated with the gas outlet of the vacuum desorption unit through the heat exchange tank set, and the heat exchange tank set comprises one buffer heat exchange tank or at least two buffer heat exchange tanks connected in series.
Further in order to recycle the adsorption unit, the system for recovering the VOCs further comprises a nitrogen supply device communicated with the adsorption unit, wherein the air outlet of the adsorption unit is communicated with the inlet of the vacuum pump, so that the VOCs in the adsorption unit can be desorbed by nitrogen purging through the cooperation of the nitrogen supply device and the vacuum pump when the adsorption unit is saturated.
After the technical scheme is adopted, the utility model discloses following beneficial effect has:
1. the utility model integrates low temperature absorption, secondary absorption, high temperature vacuum desorption and low temperature condensation recovery, can well realize high-efficiency recovery and ultralow emission of low-concentration VOCs, realizes cyclic utilization of absorption liquid and greatly reduces the recovery cost;
2. the heat of the lean absorption liquid in the low-temperature absorption unit is absorbed by the heat pump system and is used for the vacuum desorption unit, the high-temperature lean absorption liquid from the vacuum desorption unit enters the absorption liquid reflux unit, and the heat in the absorption liquid reflux unit is further absorbed and is used for the vacuum desorption unit, so that the cyclic utilization of the heat is realized, the efficiency and the energy conservation are realized, and the energy consumption cost is greatly reduced; the heat pump system outputs a cold source to the lean absorption liquid in the multifunctional low-temperature coupling absorption tank A, so that the lean absorption liquid in the multifunctional low-temperature coupling absorption tank A can better and more sufficiently absorb VOCs at low temperature, and provides a heat source to the vacuum desorption tower, so that the VOCs in the rich absorption liquid can be more sufficiently desorbed in the vacuum desorption tower;
3. when the adsorption unit is close to saturation or reaches saturation, the utility model also realizes desorption of VOCs adsorbed by the adsorption unit through the cooperation of nitrogen purging and a vacuum pump, and recovers VOCs desorbed from the adsorption unit through condensation of the low-temperature condensation recovery unit, thereby realizing recycling of the adsorption unit and also realizing maximum condensation recovery of VOCs;
4. the utility model discloses a heat transfer jar group carries out preliminary condensation to gaseous state VOCs, realizes the secondary degree of depth condensation to gaseous state VOCs through condensing system, and then realizes the high-efficient recovery to VOCs, also avoids the high temperature gaseous state VOCs who comes out from vacuum desorption unit to cause the injury to condensing system.
Drawings
Fig. 1 is the utility model discloses a VOCs recovery system's schematic structure.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
Example one
As shown in fig. 1, a system for recovering VOCs comprises:
the low-temperature absorption unit is used for absorbing VOCs in the incoming VOCs at low temperature to obtain lean-grade VOCs gas, and lean-grade absorption liquid in the low-temperature absorption unit becomes rich-grade absorption liquid after absorbing the VOCs;
the vacuum desorption unit is connected with the low-temperature absorption unit and is used for carrying out high-temperature vacuum desorption on the rich-grade absorption liquid to desorb gaseous VOCs, and the rich-grade absorption liquid is desorbed from the gaseous VOCs and then becomes lean-grade absorption liquid;
the absorption liquid reflux unit is connected with the vacuum desorption unit and is used for cooling the lean absorption liquid discharged by the vacuum desorption unit and returning the cooled lean absorption liquid to the low-temperature absorption unit;
the low-temperature condensation recovery unit is connected with the vacuum desorption unit and is used for condensing and recovering the gaseous VOCs into liquid VOCs;
and the adsorption unit is connected with the low-temperature absorption unit and is used for adsorbing VOCs in the lean-grade VOCs gas to obtain gas meeting the emission standard.
In this embodiment, VOCs recovery system still includes exhaust-gas conveying pipe and emergent discharge line, and the exhaust-gas conveying pipe is linked together with low temperature absorption unit and emergent pipeline respectively, and exhaust-gas conveying pipeline is used for carrying VOCs to come gas, and the VOCs that the inspection is up to standard comes gas by emergent discharge line emission to the atmosphere in, and the inspection unqualified VOCs comes gas to get into in the low temperature absorption unit. The gas outlet of the adsorption unit is also communicated with an emergency discharge pipeline, a metering ball valve 1 is arranged at the position of the emergency discharge pipeline close to the waste gas conveying pipe, and a ball valve 2 is arranged on a pipe for communicating the adsorption unit and the low-temperature absorption unit.
Specifically, the utility model discloses collect low temperature absorption, secondary absorption, high temperature vacuum desorption and hang downWarm condensation is retrieved in an organic whole, can realize low concentration VOCs's high-efficient recovery and ultralow emission well to realize the cyclic utilization of absorption liquid, greatly reduced the recovery cost. In the embodiment, the low-concentration VOCs generally has a concentration of 0-10%, and the discharge standard of the whole recovery system is far lower than the national standard (50 mg/m)3）。
As shown in fig. 1, in order to provide a heat source to the vacuum desorption unit through the low-temperature absorption unit and the absorption liquid recovery unit to realize the recycling of heat, the VOCs recovery system further includes a heat pump system 6, wherein a cold end of the heat pump system 6 is connected to the low-temperature absorption unit and the absorption liquid reflux unit, and a hot end of the heat pump system is connected to the vacuum desorption unit, so that heat flows from the low-temperature absorption unit and the absorption liquid reflux unit to the vacuum desorption unit.
Specifically, the heat of the lean absorption liquid in the low-temperature absorption unit is absorbed by the heat pump system 6 and is used for the vacuum desorption unit, the high-temperature lean absorption liquid coming out of the vacuum desorption unit enters the absorption liquid reflux unit, and the heat in the absorption liquid reflux unit is further absorbed and is used for the vacuum desorption unit, so that the heat is recycled, the efficiency and the energy saving are realized, and the energy consumption cost is greatly reduced.
As shown in fig. 1, in order to prevent VOCs from being incompletely recovered, the gas outlet end of the low-temperature condensation recovery unit communicates with the gas inlet of the low-temperature absorption unit so that uncondensed gaseous VOCs are returned to the low-temperature absorption unit.
As shown in fig. 1, the low temperature absorption unit includes:
an ejector 4 having a gas inlet for receiving incoming gas of VOCs and an absorption liquid inlet end thereof communicating with an outlet end of the absorption liquid reflux unit;
the shell layer inlet end of the multifunctional low-temperature coupling absorption tank A5 is communicated with the outlet end of the ejector 4, the tube layer of the multifunctional low-temperature coupling absorption tank is connected with the cold end of the heat pump system 6, the shell layer outlet end of the multifunctional low-temperature coupling absorption tank is communicated with the inlet end of the vacuum desorption unit, and the gas outlet end of the multifunctional low-temperature coupling absorption tank is communicated with the adsorption unit.
As shown in fig. 1, the vacuum desorption unit includes:
the absorption liquid inlet end of the vacuum desorption tower 12 is communicated with the absorption liquid outlet end of the low-temperature absorption unit, the pipe layer of the vacuum desorption tower is connected with the hot end of the heat pump system 6, and the absorption liquid outlet end of the vacuum desorption tower is communicated with the absorption liquid reflux unit;
and the air inlet of the vacuum pump 16 is communicated with the air outlet of the vacuum desorption tower 12, and the air outlet of the vacuum pump is communicated with the low-temperature condensation recovery unit.
As shown in fig. 1, the absorption liquid reflux unit includes:
the shell layer inlet end of the water-cooled heat exchanger 11 is communicated with the absorption liquid outlet end of the vacuum desorption unit;
the shell layer inlet end of the multifunctional low-temperature coupling absorption tank B7 is communicated with the shell layer outlet end of the water-cooled heat exchanger 11, and the tube layer of the multifunctional low-temperature coupling absorption tank B7 is connected with the cold end of the heat pump system 6;
and the inlet of the pump body 3 is communicated with the shell outlet end of the multifunctional low-temperature coupling absorption tank B7, and the outlet of the pump body is communicated with the absorption liquid inlet end of the low-temperature absorption unit.
Specifically, the heat pump system 6 outputs a cold source to the lean absorption liquid in the multifunctional low-temperature coupled absorption tank a5, so that the lean absorption liquid in the multifunctional low-temperature coupled absorption tank a5 can better and more sufficiently absorb VOCs at low temperature, the heat pump system 6 provides a heat source to the vacuum desorption tower 12, and then the VOCs in the rich absorption liquid can be more sufficiently desorbed in the vacuum desorption tower 12.
In the embodiment, the multifunctional low-temperature coupling absorption tank A5 and the multifunctional low-temperature coupling absorption tank B7 are plate-type multifunctional low-temperature coupling absorption tanks which are heat exchangers, the temperature is-20 to-30 ℃, and the temperature of the vacuum desorption tower 12 is 90 to 110 ℃.
As shown in fig. 1, the cryogenic condensation recovery unit includes:
a condensing system 14 communicating with the gas outlet of the vacuum desorption unit to condense the gaseous VOCs entering therein into liquid VOCs;
a recovery tank 15 in communication with the condensing system 14 to recover liquid VOCs.
In the embodiment, the condensation system 14 is a cryogenic condenser, and the temperature is between-30 ℃ and-70 ℃. The recovery tank 15 is a recovery horizontal tank.
As shown in fig. 1, in order to prevent the high-temperature gaseous VOCs coming out of the vacuum desorption unit from damaging the condensation system 14, the low-temperature condensation recovery unit further includes a heat exchange tank set for pre-condensing the gaseous VOCs, an inlet end of the condensation system 14 is communicated with a gas outlet of the vacuum desorption unit through the heat exchange tank set, and the heat exchange tank set includes one buffer heat exchange tank or at least two buffer heat exchange tanks connected in series.
Specifically, the utility model discloses a heat transfer jar group carries out preliminary condensation to gaseous state VOCs, realizes the secondary degree of depth condensation to gaseous state VOCs through condensing system 14, and then realizes that the high-efficient recovery to VOCs also avoids the high temperature gaseous state VOCs who comes out from vacuum desorption unit to cause the injury to condensing system 14.
In the present embodiment, the buffer heat exchange tank is provided with two, respectively, a buffer heat exchange tank a13 and a buffer heat exchange tank B17, the buffer heat exchange tank a13 is connected between the vacuum desorption tower 12 and the vacuum pump 16 of the vacuum desorption unit to prevent the high-temperature gaseous VOCs from damaging the vacuum pump 16, and the buffer heat exchange tank B17 is connected between the vacuum pump 16 and the condensing system 14.
As shown in fig. 1, in order to make the adsorption unit reusable, the VOCs recovery system further comprises a nitrogen gas supply device 10 in communication with the adsorption unit, and the gas outlet of the adsorption unit is in communication with the inlet of the vacuum pump 16, so that VOCs in the adsorption unit are desorbed by nitrogen purge through cooperation of the nitrogen gas supply device 10 and the vacuum pump 16 when the adsorption unit is saturated.
In this embodiment, the nitrogen-purged desorbed VOCs also enter the cryocondensation recovery unit and are condensed and recovered by the cryocondensation recovery unit.
The adsorption unit includes at least one adsorption column for adsorbing VOCs. In this embodiment, two adsorption towers are arranged in parallel, namely an adsorption tower A8 and an adsorption tower B9, and the adsorption tower A8 and the adsorption tower B9 are respectively communicated with the gas outlet end of the multifunctional low-temperature coupling absorption tank A5 of the low-temperature absorption unit.
In this embodiment, the VOCs recovery system further comprises a cooling water inlet pipe and a cooling water outlet pipe, wherein the cooling water inlet pipe is respectively communicated with the water inlet of the water-cooling heat exchanger 11, the water inlet of the buffer heat exchange tank a13 and the water inlet of the buffer heat exchange tank B17, and the cooling water outlet pipe is respectively communicated with the water outlet of the water-cooling heat exchanger 11, the water outlet of the buffer heat exchange tank a13 and the water outlet of the buffer heat exchange tank B17.
Specifically, when the adsorption unit is close to saturation or reaches saturation, the utility model discloses still realize the desorption to the adsorbed VOCs of adsorption unit through nitrogen gas sweep and vacuum pump 16's cooperation to retrieve the VOCs that the unit condensation was come out from adsorption unit desorption through the low temperature condensation, and then realized adsorption unit's reuse, also accomplished the condensation recovery to VOCs furthest.
Example two
A method for recovering a system for recovering VOCs as described in example one, comprising the steps of:
the low-temperature absorption unit preliminarily absorbs VOCs in VOCs incoming gas entering the low-temperature absorption unit at low temperature to obtain lean-grade VOCs gas, and lean-grade absorption liquid in the low-temperature absorption unit becomes rich-grade absorption liquid after absorbing the VOCs;
the adsorption unit further adsorbs VOCs in the lean-grade VOCs gas to obtain gas meeting the emission standard;
the vacuum desorption unit carries out high-temperature vacuum desorption on the rich absorption liquid to desorb the gaseous VOCs, and the rich absorption liquid becomes the lean absorption liquid after being desorbed the gaseous VOCs;
the low-temperature condensation recovery unit condenses the gaseous VOCs into liquid VOCs and recovers the liquid VOCs;
and the absorption liquid reflux unit cools the lean absorption liquid discharged by the vacuum desorption unit and returns the cooled lean absorption liquid to the low-temperature absorption unit.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (9)
1. A VOCs recovery system is characterized in that,
it includes:
the low-temperature absorption unit is used for absorbing VOCs in the incoming VOCs at low temperature to obtain lean-grade VOCs gas, and lean-grade absorption liquid in the low-temperature absorption unit becomes rich-grade absorption liquid after absorbing the VOCs;
the vacuum desorption unit is connected with the low-temperature absorption unit and is used for carrying out high-temperature vacuum desorption on the rich-grade absorption liquid to desorb gaseous VOCs, and the rich-grade absorption liquid is desorbed from the gaseous VOCs and then becomes lean-grade absorption liquid;
the absorption liquid reflux unit is connected with the vacuum desorption unit and is used for cooling the lean absorption liquid discharged by the vacuum desorption unit and returning the cooled lean absorption liquid to the low-temperature absorption unit;
the low-temperature condensation recovery unit is connected with the vacuum desorption unit and is used for condensing and recovering the gaseous VOCs into liquid VOCs;
and the adsorption unit is connected with the low-temperature absorption unit and is used for adsorbing VOCs in the lean-grade VOCs gas to obtain gas meeting the emission standard.
2. The VOCs recovery system of claim 1,
the heat pump system further comprises a heat pump system (6), the cold end of the heat pump system (6) is respectively connected with the low-temperature absorption unit and the absorption liquid backflow unit, and the hot end of the heat pump system is connected with the vacuum desorption unit, so that heat flows to the vacuum desorption unit from the low-temperature absorption unit and the absorption liquid backflow unit.
3. The VOCs recovery system of claim 1,
and the gas outlet end of the low-temperature condensation recovery unit is communicated with the gas inlet of the low-temperature absorption unit so that uncondensed gaseous VOCs are returned to the low-temperature absorption unit.
4. The VOCs recovery system of claim 2,
the low temperature absorption unit includes:
an ejector (4) having a gas inlet for receiving incoming gas of VOCs and having an absorption liquid inlet end in communication with an outlet end of the absorption liquid reflux unit;
and the shell layer inlet end of the multifunctional low-temperature coupling absorption tank A (5) is communicated with the outlet end of the ejector (4), the tube layer of the multifunctional low-temperature coupling absorption tank A is connected with the cold end of the heat pump system (6), the shell layer outlet end of the multifunctional low-temperature coupling absorption tank A is communicated with the inlet end of the vacuum desorption unit, and the gas outlet end of the multifunctional low-temperature coupling absorption tank A is communicated with the adsorption unit.
5. The VOCs recovery system of claim 2,
the vacuum desorption unit includes:
the absorption liquid inlet end of the vacuum desorption tower (12) is communicated with the absorption liquid outlet end of the low-temperature absorption unit, the pipe layer of the vacuum desorption tower is connected with the hot end of the heat pump system (6), and the absorption liquid outlet end of the vacuum desorption tower is communicated with the absorption liquid reflux unit;
and the air inlet of the vacuum pump (16) is communicated with the air outlet of the vacuum desorption tower (12), and the air outlet of the vacuum pump is communicated with the low-temperature condensation recovery unit.
6. The VOCs recovery system of claim 2,
the absorption liquid reflux unit includes:
the shell layer inlet end of the water-cooled heat exchanger (11) is communicated with the absorption liquid outlet end of the vacuum desorption unit;
the shell layer inlet end of the multifunctional low-temperature coupling absorption tank B (7) is communicated with the shell layer outlet end of the water-cooling heat exchanger (11), and the tube layer of the multifunctional low-temperature coupling absorption tank B is connected with the cold end of the heat pump system (6);
and the inlet of the pump body (3) is communicated with the shell outlet end of the multifunctional low-temperature coupling absorption tank B (7), and the outlet of the pump body is communicated with the absorption liquid inlet end of the low-temperature absorption unit.
7. The VOCs recovery system of claim 1,
the cryogenic condensation recovery unit includes:
a condensing system (14) in communication with the gas outlet of the vacuum desorption unit to condense gaseous VOCs entering therein to liquid VOCs;
a recovery tank (15) in communication with the condensing system (14) to recover liquid VOCs.
8. The VOCs recovery system of claim 7,
the low-temperature condensation recovery unit further comprises a heat exchange tank set used for pre-condensing the gaseous VOCs, the inlet end of the condensation system (14) is communicated with the gas outlet of the vacuum desorption unit through the heat exchange tank set, and the heat exchange tank set comprises one buffer heat exchange tank or at least two buffer heat exchange tanks connected in series.
9. The VOCs recovery system of claim 5,
the adsorption unit is characterized by further comprising a nitrogen supply device (10) communicated with the adsorption unit, wherein the air outlet of the adsorption unit is communicated with the inlet of the vacuum pump (16) so that VOCs in the adsorption unit can be desorbed by nitrogen purging through the cooperation of the nitrogen supply device (10) and the vacuum pump (16) when the adsorption unit is saturated.
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| CN202022559153.3U CN213761193U (en) | 2020-11-09 | 2020-11-09 | VOCs recovery system |
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| CN202022559153.3U CN213761193U (en) | 2020-11-09 | 2020-11-09 | VOCs recovery system |
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Address after: 213000 No. 588, Laodong Road, Tianning District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Daheng Environmental Equipment Manufacturing Co.,Ltd. Address before: 213000 No. 588, Laodong Road, Tianning District, Changzhou City, Jiangsu Province Patentee before: Jiangsu Daheng environmental protection equipment manufacturing Co.,Ltd. |