CN1330971A - Steam recovering system - Google Patents
Steam recovering system Download PDFInfo
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- CN1330971A CN1330971A CN 01124305 CN01124305A CN1330971A CN 1330971 A CN1330971 A CN 1330971A CN 01124305 CN01124305 CN 01124305 CN 01124305 A CN01124305 A CN 01124305A CN 1330971 A CN1330971 A CN 1330971A
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Abstract
A vapour recovering system for volatile liquid comprising sorbent beds capturing the vapour of the volatile liquid; a booster pump and a vacuum pump in series connected to regenerating the sorbent beds. A motor speed controller regulates the motor speed of the booster pump. The motor speed controller is exercisablly connected to at least one sensor for detecting one or more operating parameters including but not limited to: pressure, temperature, current and sound level for booster pump.
Description
Technical field
The present invention relates generally to volatile liquid vapor control field, especially relate to a kind of apparatus and method that improve combination absorption/condensing steam recovery system efficient.
Background technology
When processing comprises the volatility organic mixture (VOC) of engine fuel and solvent, be easy to produce air-volatile liquid vapor mixture.This air-steam mixture directly enters atmosphere can cause the severe contamination of environment and potential catching fire or explosion danger.Therefore, existing environmental regulation requires these dischargings of control.
Therefore, develop and used many method and apparatus, so that from air-volatile liquid vapor mixture, reclaim volatile liquid.Usually, the volatile liquid that is recovered is liquefied and combines again with being vaporized the volatile liquid that forms this steam, thereby makes removal process more economical.
The used initial vapour recovery system of the '20s latter stage and the '30s initial stage U.S. comprises the combined treatment of compression and condensation.This system only is used in the gasoline tank at first.Air pollution legislation up to the fifties locality comes into effect, and just is forced in truck loading transfer oil depot place and sets up vapour recovery system.Soon afterwards, " clean air " legislation activity in the sixties has also caused the attention that problem is reclaimed to gasoline vapour in the whole nation, and this activity has caused the air purification method of nineteen sixty-eight.The result developed a kind of oil-poor/absorption system.This system has occupied market in a short time.
Then, at latter stage in the sixties and the seventies initial stage, cryogenic refrigeration system begins to obtain market approval (for example United States Patent (USP) 3,266,262 of Moragne).And reliably cryogenic system has and comprises the many shortcomings that need high pass filter.In addition, this system needs quite strict and expensive maintenance correctly to work.With respect to the refrigerating capacity that can be transmitted, the mechanical refrigeration system also has actual restriction, and therefore the efficient and the capacity of this system are restricted.Compare, liquid nitrogen cooling system provides the cooling that exceeds needs, but too high for this type of applied cost.
Because these shortcomings begin to seek other technology, and have further developed absorption/absorption vapour recovery system recently.This system is disclosed in many United States Patent (USP)s, and for example 4,276 of Dinsmore, 058 patent, they are introduced in full as list of references.This system uses a solid adsorbent beds, and for example described adsorbent can be selected from the porous mineral matter of silica gel, certain form, and this porous mineral matter is such as alum clay and magnesia, and activated carbon preferably.These adsorbents have a kind of affinity for various VOC.Therefore, when air-VOC steam mixture passed through described bed, the most of VOC that is included in the mixture was adsorbed by described bed.The residual gas stream that comprises the VOC free air substantially that produces is arranged in the discharging scope that rules allow and is discharged into surrounding environment.
Will be appreciated that the adsorbent bed that is used in these systems can only absorb a certain amount of VOC before reaching rated capacity, lost efficacy then.Therefore, described bed must periodically be regenerated, activated carbon is returned to a kind of level that can absorb VOC more effectively.This regeneration of adsorbent is a kind of processing procedure in two steps.
The first step need reduce gross pressure by vacuumizing in bed, and this will remove the VOC of maximum.Second step was to introduce cleaned gas stream, made it through described bed.The described bed of purge gas flushing.Usually, this air-flow can be an air, but can be inert gas, for example nitrogen in some applications.These VOC are pumped into a condensing tower then, wherein are provided with a kind of absorbent fluid, the liquid of for example oil-poor or other low volatility, and it is with respect to the air that the is rich in VOC-VOC mixture reverse flow from the pumping of described bed.Described absorbent fluid is removed lot of V OC from the sort of mixture, and is recycled to second sorbent bedly from the residual vaporous stream of condensing tower, has finished regeneration for first simultaneously.
Typically be provided with a kind of, use the liquid-ring vacuum pump to produce vacuum with the reproducing adsorbent bed.The ability of such mechanical vacuum extractor has certain limit, can take out the vacuum that is less than about 74mm HgA or 90% perfect vacuum.The regeneration of the adsorbent bed under the 74mm HgA level is suitable for the light VOC of middle and high concentration, and for example they generally are present in the gasoline vapour.But, this vacuum level be not enough to the regenerate light VOC that has been exposed to low concentration or the adsorbent among the certain density heavy VOC, this VOC is aromatic compound and all kinds of solvents for example.Therefore, these mixtures will be accumulated in the adsorbent after a period of time, thereby greatly reduce the operating efficiency of its effective adsorption capacity and equipment.
Therefore therefore, need vapour recovery system can produce a darker vacuum, desorb and reproducing adsorbent more completely.This system can bring into play function for a long time with the operating efficiency that strengthens.
According to purpose of the present invention as herein described, provide a kind of volatile liquid vapor recovery system.In detail, the volatile liquid vapor recovery system comprises at least one adsorbent bed, be used for reproducing adsorbent booster pump and vavuum pump, be used for the condensation volatile liquid vapor a condensing tower, be used for cool stream to the refrigerating system of the circulating fluid at condensing tower top, be used to drive described booster pump and vavuum pump motor, be used to detect a sensor and a controller of selected parameter, the speed of service that the selected parameter that described controller detects according to sensor is regulated the booster pump CD-ROM drive motor.By this way, booster pump more effectively operated and also effectively with the liquid ring vacuum series connection of pumps.
According to the first embodiment of the present invention, described sensor is one first pressure sensor unit and one second pressure sensor unit, this first module is used to detect the booster pump upstream first ducted pressure, and this Unit second is used to detect in the booster pump downstream and the second ducted pressure of vavuum pump upstream.
According to second embodiment, described sensor is the ammeter of a monitoring motor current.This sensor can be monitored the load on the booster pump effectively.
According to still another embodiment of the invention, described sensor is the energy consumption sensor of a monitoring motor institute consumed power.This sensor can be monitored the load on the booster pump effectively.
According to still another embodiment of the invention, a timer can be used to regulate the speed of service of booster pump motor, thereby regulates the speed of booster pump.
According to still another embodiment of the invention, described sensor is one first temperature sensor unit and one second temperature sensor unit, this first module is used to detect the booster pump upstream first ducted temperature, and this Unit second is used to detect in the booster pump downstream and the second ducted temperature of vavuum pump upstream.
According to still another embodiment of the invention, described sensor is a sound level sensor that is used to monitor motor sound level or frequency.Described sound level or frequency are according to the load variations that is applied on the booster pump.
In aforementioned arbitrary embodiment, the speed of service of motor and the speed of service of booster pump change according to the detected parameters that measurement is applied to the load on the booster pump.This regenerates the initial stage highly significant at bed.According to the parameter that detects, controller is with a kind of speed of service that must prevent the mode governor motor of booster pump motor overload.As a result, the volatile liquid vapor recovery system under any predictable operating condition with quite high efficient work.In addition, by preventing overload, the maintenance intervals of pump and life-span are improved greatly.This has reduced downtime, maintenance time and total operating cost.
According to a further aspect in the invention, provide a kind of method that from air-volatile liquid vapor mixture, reclaims volatile liquid vapor.This method comprises volatile liquid vapor is adsorbed onto on a kind of adsorbent from air-volatile vapor mixture, so that produce the air-flow of relative non-volatility liquid vapors; On adsorbent, vacuumize, so that will be before by condensing tower of adsorbent volatile liquid vapor suction; And in condensing tower, reclaim volatile liquid vapor.This method is further characterized in that following step: produce vacuum with booster pump that is connected in series and vavuum pump; The operational factor that detection is selected from following one group, described parameter group comprise air-volatile liquid vapor mixture pressure, air-volatile liquid vapor mixture temperature, booster pump CD-ROM drive motor electric current or power and booster pump sound level; According to the speed of service of detected parameters control booster pump, so that avoid the booster pump overload and reclaim volatile liquid vapor in an efficient way.
Those skilled in the art can understand other purpose of the present invention from following explanation, wherein represent and described a preferred embodiment of the present invention, and this only is that a kind of realization optimum way of the present invention has been described.Can recognize that the present invention can have other different embodiment, and can modification under the situation that does not depart from the scope of the invention.Therefore, accompanying drawing and explanation are indicative rather than restrictive.
The accompanying drawing summary
The accompanying drawing that is included in the specification and forms a specification part has been represented aspects more of the present invention, and is used from specification one and explains principle of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of a kind of volatile liquid vapor recovery system of expression, and it comprises improved pumping unit of the present invention;
Fig. 2 a and 2b are the flow charts that is used for the variant control system of motor, and its driving is included in the booster pump in the vapour recovery system shown in Figure 1.
The preferred embodiments of the present invention will be described in detail belows, and each example expression in the accompanying drawings.
Detailed description of the present invention
With reference to Fig. 1 and 2, they represent volatile liquid vapor recovery system 10 of the present invention.As can be seen, volatile liquid vapor recovery system 10 can more effectively be worked with benefit and the output that remarkable increase is provided from explanation.This is by prolonging maintenance intervals, reduction maintenance cost and increasing work efficiency and realize.Vapour recovery system 10 usually as the name of the United States Patent (USP) 4,066,423 of McGill etc. and Menzenski be called the United States Patent (USP) 5,426,945 of " method and apparatus of recovery steam ", the disclosed content of these documents is used as reference entirely at this.
As shown in the figure, the VOC that supplies with from a tank 16 by a feeding pipe 18 is housed (for example in truck, oil truck and other container 14, engine fuel and solvent) time, vapour recovery system 10 is particularly suitable for reclaiming the vaporization VOC that discharges from truck, oil truck and other container 14.Especially, those steams are used as a kind of air-VOC steam mixture and are collected in the collection pipeline 20, and this pipeline is connected to truck 14 and is transported to a condensation by a steam check-valves 22 and pressure/vacuum outlet 24 and divides in the liquid bath 26.Therefrom, air-VOC steam mixture is by way of pipeline 28,29 and 30, and the valve 32 (valve 33 is closed) that process is opened arrives first contactor 34 that comprises first adsorbent bed 36.Bed 36 absorbs the VOC steam, and clean air enters atmosphere by valve 38, and valve 39 is closed.
Simultaneously, the adsorbent bed 40 in second contactor 42 is reproduced: promptly give the ability that bed 40 absorbs steam again.In order to realize this purpose, valve 44 and 45 is closed earlier, and a positive discharge capacity vacuum gooster pump 46 that is connected in series and a liquid-ring vacuum pump 47 are actuated to vacuumize to the adsorbent bed 40 in second contactor 42.This positive discharge capacity vacuum gooster pump 46 approximately has a capacity between 300～6000cfm, and for example can obtain from Roots Division of Dresser Industries (for example Model RGS-J).Usually, road as known in the art, liquid-ring vacuum pump has two-stage, and capacity is 100～2000cfm.This pump for example can be from Graham Vacuum Pump of Batavia, and New York (for example Model 2V7240) obtains.
When pump 46 and 47 was taken out low about 20mmHgA of arriving or 97% pure vacuum with the vacuum in the contactor 42, the mixture of air and volatile liquid vapor was extracted out from bed 40.It is much lower that this vacuum level obtains (being the vacuum of about 74mmHgA) than liquid-ring vacuum pump of independent operation.Therefore, though the also successfully desorb of quilt from adsorbent of heavier aromatic compound and solvent, thus described adsorbent is regenerated more fully so that later on so that more high efficiency and ability are carried out the absorption of VOC steam.By operation valve 56 (opening) and valve 57 (closing), the air and the volatile liquid vapor mixture that aspirate out from described bed are imported into fluid-encapsulated separator 54 by pipeline 48,50,51,52 by pump 46 and 47 again.Fluid-encapsulated separator 54 separates the fluid-encapsulated of this pumping, need carry out 46,47 operations of correct pump from condensation volatile liquid and the air-steam mixture that is recovered, and described mixture is introduced condensing tower 60 by pipeline 58.By heat exchanger 76, the fluid-encapsulated circulation by pipeline 59 again by pump 74 of reclaiming from separator 54 arrives liquid-ring vacuum pumps 47.
Towards the end of regeneration cycle (for example, when reaching a specific vacuum level or for the specific time, for example last 1 to 2 minute of circulation in 10 to 17 minutes), a spot of scavenging air is introduced into contactor 42 by open valve 45.This scavenging air by pipeline 62 from ambient atmosphere, take out and flow through the bed 40 so that from adsorbent the cleaning more VOC.In this process, will be appreciated that scavenging air only is enough to keep substantially 20mmHgA and introduces to the speed of 25mHgA pressure or 97% pure vacuum with a kind of.Scavenging air and remaining VOC also import condensing tower 60 by pump 46,47 by separator 54 and pipeline 58.
As everyone knows, condensing tower 60 provides the reverse flow of cooling fluid by a dispersion injector (not shown), and this cooling fluid for example reclaims product.Cooling fluid is removed volatile liquid vapor by condensation from air-volatile liquid vapor mixture, described mixture is extracted out from contactor 42 by pump 46,47, as previously mentioned.
The VOC of condensation and cooling fluid preferably return pump 64 by product liquid that is driven by motor 65 (also seeing Fig. 2) of operation and collect from the bottom of condensing tower 60, and are transported to tank 16 through pipeline 66 by a unidirectional flow control valve (not shown) then.Preferably, pump 64 is a kind of ANSI pumps, is for example made by Ingersoll-Dresser, and its per minute can pumping 25-200 gallon.The size of pump 64 and motor 65 depends on top pressure in the tank 16 and required rate of pumping or flow velocity.See the United States Patent (USP) 5,871,568 of Gibson about the detailed description in the product liquid loop 10 that comprises pump 64 and motor 65, its disclosed content is used as list of references.
The residual air of discharging from condensing tower 60 does not have volatile liquid vapor substantially.But it preferably is recycled by pipeline 77 and 30 and introduces first contactor 34.By this way, any residual volatile liquid vapors can be trapped in the bed 36, so that finished air cleaning before entering atmosphere by valve 38.
Certainly, should be understood that by prior art contactor 34 and 42 is basic identical, and because continuous process need be provided, their operation can be by conversely.This means that bed 36 can be reproduced with reference to bed 40 described modes with the front when bed 36 when saturated, bed 40 is used to catch VOC with the front with reference to bed 36 described modes simultaneously.This only just can realize by valve is passed through flowing of vapour recovery system 12 with control respectively conversely to 32 and 33,56 and 57,38 and 44,39 and 45 operation.
There is not maintenance operation in order to allow the most economical effective of booster pump 46, must prevent the overload of this pump and CD-ROM drive motor 82 thereof, and therefore reduce or eliminate the result that any temperature that produces through booster pump raises, particularly bed regeneration/absorption container vacuumize in early days.For this purpose, consider the embodiment of six different control systems, two see Fig. 2 a.Shown in Fig. 2 a, a variable speed driver 82 drives booster pump 46.Variable speed driver 82 is connected to a speed control 84, for example a kind of variable frequency drives.As shown in the figure, speed control 84 is connected on the controller 86 of a special use or program-controlled logic controller form, and this controller is for example by GE, A1len-Bradley, and Siemens etc. can obtain.
Again as shown in the figure, a first sensor unit 88 is connected in the pipeline 50 of booster pump 46 upstreams.One second sensor unit 90 is connected on the pipeline 51, and it is positioned at booster pump 46 downstreams, vavuum pump 47 upstreams.The output signal of sensor 88,90 is passed to controller 86 by holding wire 92,94.
In one embodiment of the invention, sensor the 88, the 90th, pressure sensor, it is used for monitoring the operating pressure (no matter being on the atmospheric pressure or under atmospheric pressure) in the pipeline 51 of the pipeline 50 of booster pump 46 upstreams and booster pump 46 downstreams, vavuum pump 47 upstreams.The signal that is directly proportional with detected pressures road 92,94 along the line offers controller 86.Controller 86 receives and handles these signals.Controller 86 sends to speed control 84 with a control signal along holding wire 96 then.Speed control 84 is avoided the mode governor motor 82 of booster pump overload and the speed of service of booster pump 46 with a kind of again, and the basic booster pump that more economical operation is effectively connected with vavuum pump 47 under any foreseeable operating condition.According to this method, booster pump 46 discharge and the pressure reduction of suction side controlled, so booster pump and motor 82 thereof will no longer transship.In initial vacuumizing phase, inhale, row pressure power will equate or equal substantially.When the booster pump swabbing pressure reduces, the speed of booster pump and pressure reduction will increase up to booster pump 46 and reach its maximal rate.When swabbing pressure reaches the specific value of setting, booster pump will reach maximal rate.The actual pressure and the actual final speed that are set at the value of setting will change with the physical size of booster pump 46 and liquid-ring vacuum pump 47 and associated motor thereof.
According to an optional embodiment of the present invention, sensor the 88, the 90th, the temperature sensor unit, they detect operating temperature rather than pressure in pipeline 50 and 51 respectively, so that realize identical purpose.According to this method, the temperature of booster pump 46 is maintained under the maximum of booster pump producer qualification.These values will change according to the variation of pump size, material and producer.Usually, pump 46 will be maintained under the temperature than low 25-50 of the maximum of recommending (for example, if the maximum temperature of 250 of manufacturer's recommended, controller can remain on temperature in 200-225 the scope).
Another embodiment of control system of the present invention sees Fig. 2 b.Similar Fig. 2 a, Fig. 2 b represent a for example variable frequency drives and controller 86 that is used for motor 82 of a variable speed driver that is used to drive booster pump 46 82, speed control 84.But, not two sensors 88,90 shown in Fig. 2 a, these other two embodiment comprise a sensor 98 that is connected between motor 82 and the controller 86.In one embodiment, this sensor 98 is by the energy consumption of the monitoring electric energy detection motor 82 that motor consumed.For example, an ammeter can be set to detect the electric current of motor 82.The signal that is directly proportional with detected parameters is sent to controller 86 by sensor 98 along holding wire 100.According to this signal, controller 86 sends a control signal to speed control 84 along holding wire 102, speed control 84 changes the speed of motor 82, and the words that need, also change the speed of booster pump 46, avoiding booster pump overload, and the booster pump that is connected in parallel with most economical effective and efficient manner operation and vavuum pump 47.
In another embodiment of the present invention, sensor 98 is the sound level sensor, the work sound level or the frequency of its monitoring motor 82.Represent the signal of detected parameters to send to controller 86 through holding wire 100.Controller 86 transmits control signal to speed control 84 along control line 102 again, and the speed of service of described speed control governor motor 82 and booster pump 46 is to provide required system's operation.
In the 3rd optional embodiment, the speed of service of a governor motor 82 of sensor 98 usefulness, and therefore regulate the timer replacement of pump 46 speed.
The front description of a preferred embodiment is in order to explain and to illustrate.Be not invention to be limited to disclosed a kind of precise forms.Can carry out tangible modification according to above-mentioned enlightenment.Select and describe this embodiment so that the best understanding to the present invention and application principle thereof to be provided, thereby make those skilled in the art implement the present invention with the various embodiment and the modification that are suitable for application-specific.All these modification all are arranged in the scope of claims, and they are fair, legal and should be protected.
Claims (10)
1. volatile liquid vapor control system comprises:
At least one adsorbent bed;
A booster pump and a liquid-ring vacuum pump of described bed are used to regenerate;
Be used to the condensing tower of volatile liquid vapor that condenses;
Be used to drive a motor of described booster pump;
Be used to detect at least one sensor of at least one selected operational factor; And
A controller, the speed of service that at least one selected parameter that described controller detects according to described at least one sensor is regulated described motor, thereby described booster pump by more economical effectively with described liquid-ring vacuum pump serial operation.
2. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is one first pressure sensor unit and one second pressure sensor unit, this first module is used to detect the described booster pump upstream first ducted pressure, and this Unit second is used to detect the described booster pump downstream second ducted pressure.
3. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is one first pressure sensor unit and one second pressure sensor unit, this first module is used to detect the described booster pump upstream first ducted pressure, and this Unit second is used to detect described booster pump downstream and the described vavuum pump upstream second ducted pressure.
4. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is the ammeter of a monitoring motor current.
5. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is one first temperature sensor unit and one second temperature sensor unit, this first module is used to detect the described booster pump upstream first ducted temperature, and this Unit second is used to detect the described booster pump downstream second ducted temperature.
6. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is one first temperature sensor unit and one second temperature sensor unit, this first module is used to detect the described booster pump upstream first ducted temperature, and this Unit second is used to detect described booster pump downstream and the described vavuum pump upstream second ducted temperature.
7. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is a sound level sensor that is used to monitor described motor sound level or frequency.
8. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is the energy consumption sensor of a monitoring motor institute consumed power.
9. volatile liquid vapor recovery system according to claim 1 is characterized in that:
Described at least one sensor is replaced by a timer, to regulate the speed of service of described motor.
10. volatile liquid vapor control system comprises:
At least one adsorbent bed;
A booster pump and a liquid-ring vacuum pump of serial operation, described bed is used to regenerate;
Be used to the condensing tower of volatile liquid vapor that condenses;
Be equipped with a motor of the variable speed drive that is used for described booster pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59072300A | 2000-06-08 | 2000-06-08 | |
| US09/590,723 | 2000-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1330971A true CN1330971A (en) | 2002-01-16 |
Family
ID=24363429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01124305 Pending CN1330971A (en) | 2000-06-08 | 2001-06-08 | Steam recovering system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1330971A (en) |
| BR (1) | BR0103401A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100233A (en) * | 2011-11-10 | 2013-05-15 | 浙江大江山泵阀制造有限公司 | Comprehensive treatment method for organic solvent recovery and tail gas absorption during bulk drug drying process, and treatment system for achieving the same |
-
2001
- 2001-06-08 BR BR0103401A patent/BR0103401A/en not_active Application Discontinuation
- 2001-06-08 CN CN 01124305 patent/CN1330971A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103100233A (en) * | 2011-11-10 | 2013-05-15 | 浙江大江山泵阀制造有限公司 | Comprehensive treatment method for organic solvent recovery and tail gas absorption during bulk drug drying process, and treatment system for achieving the same |
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| Publication number | Publication date |
|---|---|
| BR0103401A (en) | 2002-09-10 |
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