Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D19/00—Degasification of liquids
  • B01D19/0063—Regulation, control including valves and floats
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D19/00—Degasification of liquids
  • B01D19/0036—Flash degasification
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
  • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
  • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
  • B67D7/06—Details or accessories
  • B67D7/76—Arrangements of devices for purifying liquids to be transferred, e.g. of filters, of air or water separators
  • B67D7/763—Arrangements of devices for purifying liquids to be transferred, e.g. of filters, of air or water separators of air separators

Definitions

• the invention relates to a device for the adoption of volatile liquids, in particular for alcohol intake, and a method for the adoption of volatile liquids, in particular for alcohol intake according to the preamble of claims 1 and 7.
• the alcohol For blending alcohol, e.g. Ethanol, with water to reduce the alcohol, for example, 96% to ⁇ 76%, the alcohol is initially adopted from a tanker.
• the alcohol In the known devices, the alcohol is passed from the tank truck in a degassing, which serves as a vent tank and is located below the footprint of the truck.
• the known systems require despite low acceptance capacity a lead height between the truck and the inlet of the vent vessel of about 1, 5 to 3 m. The inlet height must be so high that a cavitation-free operation is possible.
• the present invention seeks to provide a simplified device and a more efficient method for receiving alcohol from a tanker.
• this object is achieved by a device and a method according to claim 1 and 7.
• the alcohol inlet and the alcohol outlet are arranged in the lower region, preferably in the bottom of the degassing container.
• “lower range” here one understands either the lower fifth of the side walls of the degassing tank or the bottom area. Characterized in that the alcohol inlet is provided in the lower region of the degassing, pressure losses are reduced. This makes it possible to completely hydrostatically empty the truck.
• the device for alcohol intake can be arranged above ground. Above-ground here means essentially on one level with the truck. Due to the fact that the alcohol inlet is arranged in the lower area, the degassing tank can also be filled in above-ground installation due to the hydrostatic pressure of the alcohol in the tanker.
• the alcohol inlet on the degassing vessel and / or a supply line connected to the alcohol inlet is preferably arranged below the alcohol outlet on the tank truck.
• the alcohol can be introduced into the degassing tank solely due to the static pressure of the alcohol in the tanker.
• the alcohol outlet on the tanker is lower than or equal to the alcohol inlet on the degassing tank, but higher than the feed pipe to the degassing tank, the alcohol level in the tanker may be at or below the height of the tank Alcohol inlet is located so that the container can then no longer be filled.
• the supply line comprises a bypass pipe, which is preferably connectable to a discharge from the degassing, so that the residual alcohol can be discharged or pumped through the bypass line.
• the degassing container has a device for level measurement, in particular a device for differential pressure measurement and / or a level sensor.
• a device for differential pressure measurement By determining the level, the process can be optimized depending on the level. Continuous process conditions can be guaranteed.
• the level measurement makes a continuous adjustment of the volume flow, the the subsequent mixing point is supplied, possible. If a device for differential pressure measurement is used for level measurement, there is the advantage that the pressure in the degassing vessel can also be determined via this device.
• the pressure difference measurement allows a particularly accurate determination of the level over the entire container height.
• the device comprises a pump connected downstream of the degassing vessel and a controller which regulates the pumping capacity of the feed pump as a function of the filling level.
• a controller which regulates the pumping capacity of the feed pump as a function of the filling level.
• the degassing is sealed, preferably pressure-tight, closed and includes a ventilation valve, which can be opened at negative pressure.
• a ventilation valve which can be opened at negative pressure.
• the valve is also opened when there is too much air in the degassing tank or the level drops due to the air in the headspace.
• the closed nature of the tank means that significantly less alcohol can evaporate and be released to the environment, which means a reduction in product losses.
• the invention makes it possible, instead of a control valve to arrange a seat valve in front of the degassing, which leads to a much lower pressure loss than a control valve.
• the inventive method provides that the alcohol introduced above ground from the tanker in a lower region of a degassing and also from the lower area is discharged again. According to this method, therefore, the alcohol can run in from the alcohol outlet on the tanker to the alcohol inlet in the lower region of the degassing container due to the static height difference between the alcohol level in the tanker and the alcohol inlet.
• the pumping power of a degassing container downstream feed pump is controlled in dependence on the level in the degassing.
• an alcohol pipe of the tanker is first connected to a receiving device, in particular to an acceptance panel, after which a valve is opened in a line between the alcohol outlet on the tanker and the degassing until the degassing up to a set Level N 1 is filled.
• the pump starts up slowly, ie the pumping power is increased slowly.
• the alcohol can therefore run relatively slowly in the degassing.
• a maximum volume can be introduced in the breather to achieve a long residence time and sufficient outgassing.
• a first step for example, at least two thirds of the degassing tank are filled with alcohol. Because the pump starts up slowly when the preset level N 1 is reached, there is no stop-and-go, as is necessary in the prior art, so that the volume flow can be continuously adjusted.
• the alcohol level in the degassing tank drops and so does the pressure in the headspace. If negative pressure is detected in the degassing vessel, a venting valve can be opened, for example, via a control device. This can also be prevented that the feed pump kavitiert.
• the pump power can be reduced when the level in the degassing tank has dropped below a predetermined level N 2 .
• N 2 may correspond to N 1 , but usually be lower than N 1 . As a result, the entrainment of air and or vapors at low level can be prevented, which in turn improves the mixing accuracy.
• the Alcohol from a supply line to the degassing in a bypass line, which is lower than the degassing, are passed to the degassing over preferably in a derivative of the degassing.
• the invention thus allows a total of a high intake volume flow at a low flow height, so that a ground-level installation of the device including degassing and pump is possible. Also a good degassing is also possible at the beginning and at the end of the acceptance process, which leads to a good mixing accuracy. Thus, according to the invention, a stop-and-go process is no longer necessary.
• Fig. 1 shows a schematic representation of a device for alcohol intake with a downstream mixing device
• Fig. 2 shows schematically a degassing and the alcohol outlet on the tanker
• FIG. 3 shows the essential steps of a method S1 to S8 according to the invention.
• Fig. 1 shows a schematic representation of a device for alcohol intake from a tank truck 3.
• the tanker 3 has a tank 3a, which has, for example, a capacity of 20 to 40m 3 .
• the tank 3a has an alcohol outlet 4, which, for example via a hose 5 and a connecting piece 6 with the panel 7, shown only schematically as a conduit of the device for alcohol intake is connected.
• the panel 7 comprises corresponding pipes through which the alcohol can be passed into a degassing tank 2.
• the alcohol feed line is divided into two lines, which have two mutually parallel valves 8a, b. The two lines then open again into a common line 8.
• the valves 8a, b are not control valves whose flow rate is adjustable, but seat valves, which have only a small pressure loss.
• the poppet valves 8a, b can be independently opened and closed by a controller, not shown.
• the alcohol feed line 8 then opens via the supply line 24 into the alcohol inlet 9 of the degassing container 2, which is arranged in the lower region of the degassing container 2, as is apparent in particular from FIG.
• the supply line 24 has a pipe bend.
• the term "lower region" of the degassing container 2 is intended to mean the approximately lower fifth of the container wall or else the bottom of the degassing container.
• the alcohol inlet 9 is arranged in the bottom of the container 2.
• the degassing tank 2 is used for degassing and air separation. It is preferably made of stainless steel (e.g., CrNi steel) and pressure sealed (preferably in a range of -1 bar - 0.49 bar) closed. At its lowest point, it has an alcohol outlet 10.
• the bottom tapers substantially conically downwards or is cambered.
• the discharge line 25 connects, which begins in a 60 - 90 ° -Erbogenbogen.
• the degassing vessel has a volume of about 50 to 1500 l.
• the device has a ventilation valve 11, which is opened at negative pressure or overpressure by the controller.
• the device comprises a device 20 a, b for differential pressure measurement.
• a first pressure sensor 20b is preferably provided at the bottom of the degassing tank 2, which can measure the static pressure in the degassing tank 2.
• a second pressure sensor 20a is arranged, which measures the pressure in the head space of the degassing container. This means that the pressure sensor 20b measures the static pressure of the alcohol in the degassing vessel and that of the headspace, and the pressure sensor 20a measures the pressure in the headspace.
• a level limit switch 19 is also provided for a predetermined level Ni.
• the level limit switch 19 When the alcohol reaches the filling level limit switch 19, it sends a corresponding signal to a control (not shown).
• the level limit switch 19 is arranged approximately in the upper third of the degassing tank 2.
• the degassing container may also have a lower level sensor, for example in the form of a second level limit switch. With this sensor could be determined whether the alcohol in the degassing tank 2 falls below a second predetermined level N 2 . A corresponding signal is given to the controller.
• the discharge line 25 is connected, for example, via a valve 13 to at least one feed pump 12, which is likewise arranged above ground.
• the pump 12 is controlled by the controller depending on the level. As a pump, for example, a centrifugal pump can be used.
• the pump 12 pumps the alcohol to a subsequently arranged mixing device 16, which is also supplied with water via a pump 17 for blending the alcohol.
• the alcohol after it has been passed into the degassing 2 and further promoted by the pump 12, are immediately blended with the continuous mixer 16, for example, 69% with water.
• the continuous mixer 16 for example, 69% with water.
• the mass flow meter 14 and 15 are provided, for example. This means that in the mass flow meter 14 the alcohol flow is measured and in the mass flow meter 15 the water flow.
• the device also has corresponding control valves which adjust the flow rate according to the desired mixing ratio.
• the device for alcohol intake is arranged above ground on the floor 40.
• the device for alcohol intake according to the invention does not require a high flow height of several meters, as is the case in the prior art.
• the outlet 4 of the tanker is located above the alcohol inlet 9 and also above the lowest point of the supply line 24.
• the height h between the lowest point T of the alcohol inlet 10 and the center of the outlet 4 may be in a range preferably from 200 to 500 mm.
• outlet 4 is lower than or at the same height as the alcohol inlet 9, it may be that at the end of the acceptance process the alcohol level in the tanker truck is in an area of the alcohol inlet 9 or below the alcohol inlet 9 drops, so that the static pressure is no longer sufficient to fill the degassing tank 2.
• a bypass line 21 is provided, which is connected to the discharge line 25 of the buffer tank 2.
• the valve 22 which can be opened by the controller, not shown, when the level in the container falls below a certain level, which can be measured for example via pressure difference measurement and / or another level sensor.
• the described device for alcohol intake 1 is designed to be a volatile liquid, for example ethanol, for example, with a concentration of over 90%, z. B. 96 Vol .-%, to accept from a tanker.
• An emptying of a tanker with a volume of 40 m 3 can thus be achieved in 45 minutes.
• step S1 first the connection of the truck unloading hose 5 with closed valves 8 a, b to the panel 7 takes place (step S1).
• the operator After grounding the truck, the operator opens a flap on the tank of the truck, whereby the alcohol reaches the two seat valves 8a, b.
• a sampling tap is opened and at the same time a sample of the product is taken.
• the first seat valve 8a opens, whereupon the degassing tank 2 fills up to the set control level Ni (step S2).
• a corresponding signal is given by the level limit switch to a controller. Alternatively or additionally, the level can also be determined via the pressure difference measurement.
• the feed pump 12 is driven so that its pumping power is slowly increased (step S3) and the second seat valve 8b, while or subsequently, is opened, so as to obtain the full acceptance power of, for example, 60 m 3 / hr. to reach (step S4).
• the capacity of the feed pump 12 is for example 60 -70 m 3 .
• the fill level continues to drop in the degassing vessel due to the sinking level in the tanker, this is detected, for example, by means of the differential pressure measurement and / or a fill level limit switch (not shown).
• the values are passed to the controller, which in turn reduces the pumping power of the feed pump 12 to prevent entrainment of low level air and / or vapors.
• Such a reduction of the pumping power then takes place, for example, when the level N 2 in the degassing vessel 2 has dropped, for example, to approximately a height of 10 - 40%, in particular 30%, of the height of the degassing vessel.
• the flow rate continuously decreases, for example, to 10 m 3 / h (step S6).
• this level N 2 can also be determined via a further level limit switch.
• the use of differential pressure measurement allows for more accurate process control.
• Step S8 If, at the end of filling, the liquid level in the tanker is still at a level above the alcohol inlet 9, the tanker can be completely emptied via the degassing container 2. (Step S8) If, however, at the end of the alcohol intake, the liquid level in the tank truck 3 falls within the range or below the level of the alcohol inlet 9, the bypass 21 is opened via the valve 22 so that the alcohol under the degassing vessel 2 is preferably fed directly to the discharge line 25 can be (step S7). This allows a complete emptying of the tanker truck 3. The time from when the bypass circuit must be activated, can also be determined by a level measurement (level sensor and / or pressure difference measurement).
• the valve 11 is opened to reduce the pressure.
• the opening can be done by a pressure measurement, wherein a control opens the valve 11 from a certain overpressure. But it can also be provided a pressure relief valve that automatically opens at a certain pressure.
• the alcohol is passed after acceptance in the degassing and immediately via the feed pump 12 with a continuous mixer 16, for example, to 69 vol .-%, blended with water, resulting in total, for example, to an acceptance power of about 90 m 3 / hr. of 69% alcohol.
• step S3 the mixing process at the start-up phase (step S3) is controlled via the quantity measurement of water and ethanol via control valves. Thereafter, the alcohol measurement (e.g., measuring the density or alcohol concentration) will take care of the accuracy control. The control takes place via the quantity measurement.
• the alcohol measurement e.g., measuring the density or alcohol concentration
• the device and method have been described herein in the context of alcohol (especially ethanol). Likewise, however, the apparatus and method are also suitable for accepting other volatile liquids such as gasoline, organic solvents, etc., i. Alcohol is to be understood broadly in the sense of the description and stands for liquids whose vapors can produce an explosive atmosphere. In particular, volatile volatile liquids in this application are understood as meaning those which are combustible and whose vapor pressure is higher than that of water (23.4 hPa at 20 degrees Celsius). The system according to the invention can meet the requirements of explosion protection.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Loading And Unloading Of Fuel Tanks Or Ships (AREA)
• Output Control And Ontrol Of Special Type Engine (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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• 2008
  • 2008-12-10 DE DE200810061361 patent/DE102008061361A1/de not_active Withdrawn
• 2009
  • 2009-12-10 BR BRPI0917620A patent/BRPI0917620A2/pt not_active IP Right Cessation
  • 2009-12-10 EP EP09771721A patent/EP2356063A1/de not_active Withdrawn
  • 2009-12-10 CN CN200980149792.6A patent/CN102245497B/zh not_active Expired - Fee Related
  • 2009-12-10 RU RU2011121826/12A patent/RU2517156C2/ru not_active IP Right Cessation
  • 2009-12-10 WO PCT/EP2009/008852 patent/WO2010066436A1/de active Application Filing

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