JP2009068627A - Lpg recovery device, and lpg regeneration device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LPG recovery device capable of simply recovering LPG in a stationary tank in a high recovery rate, and regenerating (reusing) the LPG. <P>SOLUTION: This LPG recovery device is provided with: a recovery tank 3 detachably connected to a bulk reservoir 2 for storing a liquefied petroleum gas therein through a connection pipe 4 and depressurized to negative pressure; activated carbon 7 stored in the recovery tank 3, and capable of emissively adsorbing the liquefied petroleum gas; and a flow pressure control device 8 controlling the flow rate of the liquefied petroleum gas recovered to the recovery tank 3 from the bulk reservoir 2, and controlling the inside of the bulk reservoir 2 to be at negative pressure equal to or larger than that of the recovery tank 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a LPG recovery device for recovering residual gas in a closed space such as a bulk storage tank or the like for storing liquefied petroleum gas (hereinafter referred to as LPG) and a closed space such as piping, and LPG filled with the LPG recovered by this LPG recovery device The present invention relates to an LPG recovery / regeneration device that regenerates (reuses) by returning it to a filling storage tank.

  In recent years, due to efforts to rationalize logistics in the LPG industry and deregulation, a “new bulk supply system” has been established to supply bulk storage directly from LPG import bases to bulk storage tanks of LP gas consumers, including households. As a result, about 160,000 bulk storage tanks have been installed until 2005, making significant progress from logistics using gas cylinders. On the other hand, with the widespread use of bulk storage tanks, there have been an increasing number of cases where repairs are made due to failures in the accessories of the bulk storage tank. Before the repair, it is necessary to extract gas from the bulk storage tank. In this case, conventionally, the extracted LPG is combusted or discharged, or a part thereof is released to the atmosphere. Or the residual gas in a bulk storage tank was collect | recovered in the collection container. As the recovery method, for example, techniques described in Patent Documents 1 and 2 are conventionally known.

  The technique described in Patent Document 1 is a method in which the LPG gas phase side in the bulk storage tank is pressurized by a compressor, the LPG liquid surface is pressed by the pressure, and the liquid phase liquefied gas is recovered by the pressure in a recovery container.

Moreover, the technique described in Patent Document 2 is a method of collecting the LPG in a collection container by heating a bulk storage tank containing LPG and increasing its internal pressure.
Japanese Patent No. 2715271 JP-A-2005-76814

  However, in such a conventional technique, when the LPG extracted from the bulk storage tank is discharged to the atmosphere, the LPG is wasted and the atmosphere is polluted. Further, in the case of disposal by combustion, the work itself is dangerous and combustion noise is generated. Furthermore, since the conventional technology described in Patent Document 1 uses a compressor when collecting LPG, it falls under the law and corresponds to a manufacturing act and requires a safety distance of 15m (class 10m for type 2). There is a problem that the usable range is very limited.

  Further, according to this method, the liquid phase of LPG can be recovered, but there is a problem that the gas phase cannot be recovered and the recovery rate is low.

  And the prior art of patent document 2 also has the subject that a gaseous phase remains and a recovery rate is low, since a gaseous phase is collect | recovered to a collection container only by heating a bulk storage tank and raising the internal pressure.

  The present invention has been made in view of such circumstances, and an object of the present invention is to further recover the LPG recovered by the LPG recovery apparatus that recovers LPG in the closed space safely and with high efficiency ( It is an object of the present invention to provide an LPG collection / reproduction device that can be reused.

  The invention according to claim 1 includes a recovery container that is detachably connected to a closed space containing liquefied petroleum gas through a connecting pipe, and a negative pressure reduced recovery container, and the liquefied petroleum gas contained in the recovery container And a flow rate for controlling the flow rate of the liquefied petroleum gas recovered from the closed space to the recovery container and controlling the closed space to a negative pressure equal to or higher than the negative pressure of the recovery container. And a pressure control means.

  In the first and subsequent claims, the closed space refers to a closed space in which LPG is accumulated, such as in a gas cylinder, a bulk storage tank, or a pipe.

  The invention according to claim 2 is characterized in that the adsorbent is activated carbon, and includes a cooling device for cooling the activated carbon and a heating device for heating the closed space. LPG recovery device.

  According to a third aspect of the present invention, the recovery container is connected to one end of the connection pipe, and a plurality of branch pipes in which a plurality of branch pipes are dispersedly arranged in the recovery container, and a plurality of holes formed in the branch pipes. The LPG recovery apparatus according to claim 1 or 2, wherein a dispersion pipe having a discharge hole is incorporated.

  According to a fourth aspect of the present invention, the dispersion pipe is connected to the connection pipe and is a mist nozzle that mists the liquid phase upstream of the discharge hole, and a heat exchange connected to the mist area. The LPG recovery apparatus according to claim 3, further comprising a fin.

  The invention according to claim 5 is provided with a liquid collection container that is connected to the closed space via the connection pipe and is decompressed to a negative pressure for sucking and collecting the liquid phase of the liquefied petroleum gas. It is an LPG collection | recovery apparatus of any one of Claims 1-3 characterized by the above-mentioned.

  According to a sixth aspect of the present invention, there is provided a liquid collection container that is connected to the closed space via the connecting pipe and mainly stores a liquid phase of the liquefied petroleum gas in the closed space; and a liquefied petroleum gas in the closed space. The LPG recovery apparatus according to claim 1, further comprising a liquid pump that pumps a liquid phase to the liquid recovery container.

  The invention according to claim 7 is the LPG recovery apparatus according to any one of claims 1 to 6, wherein the closed space is a bulk storage tank.

  According to an eighth aspect of the present invention, there is provided the LPG recovery apparatus according to any one of the first to seventh aspects of the present invention and the gas filling storage tank for storing the liquefied petroleum gas in the filling container. And a regenerator that pumps and stores the recovered liquefied petroleum gas.

  The invention according to claim 9 is characterized in that the regenerator has a second connection pipe detachably connected to the recovery container, a communication path connected to the second connection pipe and communicating with the storage tank for gas filling, A pump interposed in the communication path for sucking liquefied petroleum gas from the recovery container, a balance tank for temporarily storing the liquefied petroleum gas sucked by the pump, and pressurizing the liquefied petroleum gas in the balance tank to fill the gas The LPG regeneration device according to claim 8, further comprising a reversible compressor that is pumped to a storage tank.

  The invention according to claim 10 is the LPG regeneration device according to claim 9, wherein the pump is an ejector pump driven by liquefied petroleum gas.

  According to the present invention, since the inside of the recovery container is under negative pressure, LPG (liquefied petroleum gas) in the closed space is recovered by simply connecting the recovery container to a closed space such as a stationary storage tank via a connecting pipe. It can be sucked into the container and collected. Therefore, since the LPG in the closed space is not discharged into the atmosphere or burned out, it is possible to prevent waste of LPG and air pollution, and to prevent fire hazard and noise during combustion.

  Since the flow rate of the LPG recovered from the closed space into the recovery container is controlled by the flow rate pressure control means, the LPG is prevented from being rapidly sucked into the recovery container due to the pressure difference between the closed space and the recovery container. The inhalation speed can be controlled. For this reason, it is possible to suppress rapid heat generation and a decrease in adsorption efficiency due to the rapid adsorption of the LPG of the adsorbent when LPG is rapidly sucked into the collection container. Further, since the closed space is controlled to a negative pressure equal to or higher than the negative pressure in the recovery container by the flow rate pressure control device, it is possible to suppress or prevent the residual gas of LPG in the closed space from leaking to the outside air. .

  Furthermore, since the LPG recovered in the recovery container is adsorbed by the adsorbent, the amount of LPG recovery can be increased without increasing the capacity of the recovery container.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in these several accompanying drawings.

  FIG. 1 is a schematic view showing an example of a case where LPG stored or remaining in a bulk storage tank 2 of a stationary storage tank, which is an example of a closed space, is recovered by a recovery apparatus 1 in a recovery tank 3 made of steel or the like as a recovery container. FIG.

  As shown in FIG. 1, the recovery apparatus 1 includes a connecting pipe 4 that removably connects an outer end of a gas inlet pipe 3a of a recovery tank 3 to an outer end of an outlet pipe 2a of a bulk storage tank 2. Yes. The pressure in the bulk storage tank 2 is, for example, 0.6 MPa to 1.2 MPa. For example, a cylindrical wire net is concentrically embedded in a hose body made of synthetic resin, for example, and connection couplings C and C are provided at both ends thereof.

  Couplings C and C are also provided for removably connecting to the outlet pipe 2a of the bulk storage tank 2 and the gas inlet pipe 3a of the recovery tank 3, respectively. The connecting pipe 4 may be a flexible hose or steel pipe.

  The bulk storage tank 2 is deferred at an LPG consumer, such as a general household or a store, and has a tank body 2b made of steel having a required shape such as an elliptical sphere that accommodates the LPG, and an outlet pipe 2a disposed in the tank body 2b. And an opening / closing valve 2c interposed in the outlet pipe 2a, a liquid level indicator (not shown) for displaying the LPG liquid level in the tank body 2b, a safety valve (not shown) for preventing overfilling of the LPG, and the like. ing. The outlet pipe 2a is composed of, for example, a siphon pipe, and the inner end of the opening that opens in the tank main body 2b opens above the liquid level of the liquid phase LPG, so that the gas phase can be exhausted. Some types of the bulk storage tank 2 include a liquid phase discharge pipe (liquid pipe) for discharging the liquid phase outside the gas phase exhaust pipe. This liquid phase discharge pipe is composed of a siphon pipe whose opening inner end that opens in the tank main body 2b extends to the vicinity of the inner bottom surface in the tank main body 2b, and is configured as an extension outlet pipe 2d in FIG.

  The recovery tank 3 is provided with an opening / closing valve 3b in the gas inlet pipe 3a, and the recovery tank 3 is filled with a dispersion pipe 6 and a large number of adsorbent activated carbons 7, 7,. The pressure is reduced to

  The dispersion pipe 6 is composed of a planar or three-dimensional fork-shaped branch pipe, and the inner end of the inlet pipe 3a is connected to, for example, the substantially central portion of the main pipe 6a.

  Further, in the dispersion pipe 6, a plurality of branch pipes 6b, 6b,... Branching from the main pipe 6a are distributed almost evenly in the recovery tank 3, and a plurality of pipes that release LPG are distributed to each branch pipe 6b. Discharge holes 6c, 6c,.

  The activated carbon 7 is formed into a pellet having a required shape and a required size such as a cylinder having a diameter of about 5 mm and an axial length of about 10 mm, and LPG gas has higher adsorption efficiency than city gas. The activated carbon 7 is filled in each cell partitioned into a plurality of cells (not shown) in the collection tank 3 and is not shaken by vibrations or the like when the lorry vehicle 5 is traveling. However, it is not necessary to partition into a plurality of cells. The activated carbon 7 is subjected to a leveling process such as a pre-adsorption process in which LPG is adsorbed and released in advance in order to stabilize the LPG adsorption efficiency. In addition, the lorry vehicle 5 is integrally configured, for example, with the collection tank 3 mounted on its loading platform. However, a spare vehicle may be used instead of the lorry vehicle 5. The spare vehicle is composed of, for example, an ordinary truck, and the collection tank 3 can be mounted on the loading platform at any time and removed.

  In the middle of the connecting pipe 4, a flow pressure control device 8 is interposed. The flow rate pressure control device 8 controls the flow rate of the LPG when the LPG in the bulk storage tank 2 is recovered into the recovery tank 3, and the pressure in the bulk storage tank 2 after the LPG recovery is set to the negative pressure in the recovery tank 3. Or a negative pressure equal to or higher than the negative pressure in the recovery tank 3, or a negative pressure higher than the negative pressure (a negative pressure approaching the atmospheric pressure side).

  As shown in FIG. 2, the flow pressure control device 8 includes a manual valve 8a, an inlet pressure sensor 8b, a pressure reducer 8c, an outlet pressure sensor 8d, an electric valve 8e, a flow meter 8f, and a recovery device pressure sensor 8g. ing.

  The inlet-side pressure sensor 8b is a pressure sensor that detects the pressure in the inlet-side connecting pipe 4 of the decompressor 8c in the LPG flow direction indicated by an arrow in FIG. The outlet pressure sensor 8d is a pressure sensor that detects the pressure on the outlet side of the decompressor 8c. The flow meter 8 f detects the flow rate per unit time of the LPG in the connection pipe 4. The recovery device side pressure sensor 8 g is a pressure sensor that detects the pressure in the recovery tank 3.

  The decompressor 8c is a decompressor that decompresses the pressure on the bulk storage tank 2 side of 0.6 MPa (Pascal) to 1.2 MPa, for example, to a pressure with good LPG adsorption efficiency by the activated carbon 7 such as 0.1 MPa. The outlet pressure sensor 8d detects the pressure on the outlet side of the decompressor 8c.

  These inlet / outlet pressure sensors 8b and 8d, the flow meter 8b, the motor operated valve 8e, and the recovery device side pressure sensor 8g are electrically connected to the operation panel via signal lines (not shown). The operation panel is disposed, for example, in the vicinity of the driver's seat of the lorry vehicle 5 or in the loading platform, and includes an indicator and an operation tool.

  On the display, the inlet and outlet pressure sensors 8a and 8d and the recovery device side pressure sensor 8g respectively detect the inlet and outlet pressure detection values, the pressure detection value in the recovery tank 3, and the flow meter 8b. Further, the detected flow value of the LPG, the integrated value of the flow, and the opening degree or opening / closing of the motor operated valve 8e are displayed.

  Further, as the operating tool, an operating tool for remotely controlling the opening degree of the electric valve 8e is provided. By controlling the opening degree of the electric valve 8e by operating this operating tool, the flow rate of the LPG in the connection pipe 4 is controlled. And the pressure in the bulk storage tank 2 is equal to or higher than the negative pressure in the recovery tank 3, that is, the negative pressure in the bulk storage tank 2 is equal to or less than the negative pressure in the recovery tank 3. A predetermined value which is a high negative pressure (that is, a negative pressure close to the atmospheric pressure side), for example, a negative pressure at which the activated carbon 7 in the recovery tank 3 can improve the LPG adsorption efficiency, and a flow rate can be appropriately controlled.

  Next, a method for recovering LPG in the bulk storage tank 2 by the recovery apparatus 1 configured as described above will be described.

  First, as shown in FIG. 1, one end of the connecting pipe 4 is connected to the outer end of the outlet pipe 2a of the bulk storage tank 2, and connected by a required joint such as a coupling C, while the other end of the connecting pipe 4 is connected. Is connected to the outer end of the gas inlet pipe 3a of the recovery tank 3 by a required joint such as a coupling C.

  Next, the open / close valve 2c of the bulk storage tank 2 and the open / close valve 3b of the recovery tank 3 are opened.

  Further, the manual valve 8a of the flow pressure control device 8 is opened, and the opening of the electric valve 8e is set so that the pressure on the bulk storage tank 2 side is equal to or higher than the negative pressure in the recovery tank 3, for example, activated carbon 7 Control is performed so that the negative pressure and flow rate of the LPG adsorption efficiency are good.

  Then, since the inside of the collection tank 3 is previously depressurized to a negative pressure such as a vacuum, the LPG in the bulk storage tank 2 is sucked into the inside of the collection tank 3 through the connection pipe 4 and is decompressed by the decompressor 8 c of the flow pressure control device 8. After the pressure is reduced to a predetermined pressure and controlled to a predetermined flow rate by the motor operated valve 8e, it is discharged into the recovery tank 3 from the plurality of discharge holes 6c, 6c,. It is adsorbed by. At this time, the input and output pressure values detected by the input and output pressure sensors 8b and 8d, the detected pressure in the recovery tank 3 detected by the recovery device side pressure sensor 8g, and the flow meter 8f are detected. The detected flow rate values are respectively displayed on an indicator on an operation panel (not shown). Thereafter, the open / close valve 3b of the recovery tank 3, the open / close valve 2c of the bulk storage tank 2, the electric valve 8e and the manual valve 8a of the flow rate pressure control device 8 are closed, and the recovery of LPG ends.

  Therefore, according to this recovery device 1, the inlet pipe 3 a of the recovery tank 3 is simply connected to the outlet pipe 2 a of the bulk storage tank 2 by the connecting pipe 4, and both the on-off valves 2 c and 3 b and the flow rate pressure control device 8 LPG in the bulk storage tank 2 can be recovered by opening the manual valve 8a. For this reason, the LPG collection | recovery operation | work can be performed easily and rapidly. In addition, since LPG (liquefied petroleum gas) in the bulk storage tank 2 can be sucked into the recovery tank 3 and recovered, the LPG in the bulk storage tank 2 is not disposed of by burning or released into the atmosphere. LPG waste and air pollution can be prevented, and further, fire hazard and noise during combustion can be prevented.

  Moreover, since a compressor, a pump, or the like is not used during the LPG recovery operation, it does not correspond to a legal manufacturing act, so that both safety and ease of the LPG recovery operation can be achieved.

  In addition, since the recovery tank 3 itself maintains a negative pressure state below atmospheric pressure even after the LPG recovery, the safety of the recovery tank 3 when it is transported to the destination by a lorry vehicle 5 or a spare vehicle is improved. Can be planned.

  Further, the LPG recovered into the recovery tank 3 can be regenerated (reused) because the main component remains almost unchanged, although the odor component is slightly reduced when the activated carbon 7 is initially adsorbed. In addition, when activated carbon 7 has been subjected to the pre-treatment in advance, the reduction of the attached (wearing) odor component can also be suppressed. Further, the activated carbons 7, 7,... Can be repeatedly resorbed and rereleased by releasing the LPG after the LPG is adsorbed, and can be used for a long period of time, so that the cost can be reduced.

  In addition, since the recovered tank 3 disperses the recovered LPG in the recovery tank 3 by the dispersion pipe 6, it is possible to reduce uneven adsorption of LPG by the activated carbon 7 in the recovery tank 3. For this reason, the recovery efficiency of LPG can be improved.

  The flow rate and pressure of the LPG recovered from the bulk storage tank 2 into the recovery tank 3 are controlled by the flow rate pressure control device 8, so that the LPG is recovered by the pressure difference between the high pressure bulk storage tank 2 and the negative pressure recovery tank 3. It is possible to suppress or prevent the activated carbon in the collection tank 3 from being shaken or the dispersion pipe 6 from vibrating due to being rapidly sucked into the tank 3.

  In addition, since the inside of the bulk storage tank 2 is controlled to a negative pressure equal to or higher than the negative pressure in the recovery tank 3 by the flow pressure control device 8, it is possible to suppress or prevent the residual gas of LPG in the bulk storage tank 2 from leaking to the outside air. can do. The motor-operated valve 8e may be replaced with a solenoid valve. In that case, you may make it control the flow volume and pressure of LPG by repeating opening and closing of a solenoid valve in multiple times.

  FIG. 3 is a schematic diagram of the regenerator 10 that returns the LPG recovered into the recovery tank 3 by the recovery apparatus 1 to the filling gas storage tank 9 of the gas filling station and regenerates (reuses).

  The filling gas storage tank 9 is a large tank made of steel or the like that stores a large amount of LPG in order to fill LPG in an LPG filling container such as a gas cylinder (not shown) or a tank of a tank truck, and is installed in a filling station. Yes.

  In the filling station, a gas pipe 11 connected to the filling gas storage tank 9, a filling on-off valve 11 a interposed in the gas pipe 11, and a gas compressor connected to the filling gas storage tank 9 through the gas pipe 11 12, a swingable loading arm 13 connected to the discharge port side of the gas compressor 12 and connected to an LPG filling port of a filling container such as a tank of a tank truck (not shown).

  Then, the regenerator 10 removably connects the balance tank 15 to the loading arm 13, and further connects the balance tank 15 to a motor-driven vacuum pump 16, a thick rubber hose for a vacuum pump, or the like. The pipe 17 is configured to be sequentially communicated in this order.

  Next, a description will be given of a method in which the regeneration device 10 returns the LPG recovered in the recovery tank 3 to the filling gas storage tank 9 to perform regeneration (reuse).

  First, as shown in FIG. 3, the free tip of the connection pipe 17 is connected to the gas outlet pipe 3a of the recovery tank 3, and the vacuum pump 16 and the gas compressor 12 are operated.

  Then, the gas phase of LPG in the recovery tank 3 is sucked by the vacuum pump 16 through the connecting pipe 17 and flows into the balance tank 15, where the static pressure is recovered and then sucked by the gas compressor 12. Then, it is pressurized to a predetermined pressure and fed into the filling gas storage tank 9.

  Thereby, almost the entire amount including the liquid phase and the gas phase of LPG in the recovery tank 3 can be pumped back into the filling gas storage tank 9.

  For this reason, the LPG can be filled again from the filling gas storage tank 9 into a filling container such as a tank of the lorry vehicle 5 or a gas cylinder and regenerated (reused). That is, since it is not necessary to discharge the residual gas of LPG in the recovery tank 3 to the outside air or dispose of it by incineration, it is possible to reduce the environmental load, save energy, and improve safety. it can.

  The motor-driven vacuum pump 16 may be replaced with an ejector-type vacuum pump. That is, this ejector pump may be configured to be driven by a high pressure LPG from an LPG filling container such as a gas cylinder to suck and collect the LPG in the collection tank 3. Since the motor-driven vacuum pump 16 is driven by electricity, it needs to be an explosion-proof device when used in an explosion-proof hazardous area where flammable gas such as LPG may stay. Since the ejector pump does not use electricity, it has no ignition source and can be used safely even in hazardous locations. Further, since the ejector pump is an LPG having substantially the same component as that of the LPG to be recovered from the recovery tank 3, the LPG component recovered into the filling storage tank 9 can be substantially the same.

  By the way, when recovering LPG in the bulk storage tank 2, the bulk storage tank 2 is cooled by the latent heat of vaporization of the liquid phase of LPG, and the recovery efficiency in the gas phase is lowered particularly in winter. It is preferable to heat.

  On the other hand, on the collection tank 3 side, there is a problem that when activated carbon 7 adsorbs LPG, heat is generated, and when the temperature rises to a required temperature or more, LPG adsorption force by activated carbon 7 decreases.

  FIG. 4 is a schematic diagram of a main part of a recovery apparatus 1A according to the second embodiment of the present invention. The recovery device 1A was invented to solve the problem of the first embodiment, and the heating device 20 for heating the bulk storage tank 2 of the first embodiment and the recovery tank 3 are cooled. On the other hand, there is a feature in that a cooling / heating device 21 for heating is provided.

  The heating device 20 includes a heating jacket 18 that is detachably mounted on an outer surface such as a lower portion or a bottom portion of the bulk storage tank 2.

  That is, the heating jacket 18 is attached to an outer surface such as a lower portion or a bottom portion of the bulk storage tank 2 by winding a jacket body 18a having a required shape such as a flexible belt, and the jacket body 18a has an outer periphery of the tank body 2b. One heating pipe 18b, such as a wrapping coil, is disposed by burying or the like. The heating pipe 18b is filled and filled with water, which is an example of a heating medium, and has an inlet end 18c and an outlet end 18d protruding outward from the jacket body 18a by a predetermined length. These inlet / outlet end portions 18c and 18d connect the outlet end portion 20a and the inlet end portion 20b of the heating device 20 by a required joint j or the like. The heating device 20 includes a heat exchange pipe 20c that connects the inner ends of the outlet end 20a and the inlet end 20b, a heating device such as an electric heater and a burner (not shown) that heats the water in the heat exchange pipe 20, and A circulation pump Pa that circulates the water in the heat exchange pipe 20 with the heating pipe 18b is incorporated.

  On the other hand, the cooling / heating device 21 includes the heat exchange pipes 19 in the recovery tank 3 that are arranged in a substantially uniform manner in the recovery tank 3. A plurality of fins 19 a, 19 a,... Are mounted at a pitch, and both the inlet and outlet end portions 19 b, 19 c are projected out of the collection tank 3.

  The heating / cooling device 21 is provided with a pair of an outlet pipe 22a and an inlet pipe 22b on the outer surface of one end of the apparatus main body 21a. An inlet end 19b of the heat exchange pipe 19 is detachably connected to the outer end of the outlet pipe 22a, and an outlet end 19c of the heat exchange pipe 19 is detachably connected to the outer end of the inlet pipe 22b. ing. The inner ends of the outlet and inlet pipes 22a and 22b are connected to each other by a heat exchange pipe 21b.

  The heat exchange pipe 21b encloses a cooling / heating medium such as water, for example, and together with a circulation pump Pb that circulates the cooling / heating medium between the heat exchange pipe 21b and the heat exchange pipe 19 in the tank, It is disposed in the main body case 21 a of the cooling / heating device 21. A cooling / heating heat pump type refrigeration cycle apparatus having a four-way valve (not shown) is provided in the main body case 21a, and the heat exchange pipe 21b is cooled or heated by switching the four-way valve. Yes. The switching operation of the four-way valve is configured so that it can be operated by the operating tool on the operation panel of the flow rate pressure control device 8.

  That is, this refrigeration cycle device constitutes a refrigeration cycle in which a refrigerant, a decompression device such as a compressor, a four-way valve, a condenser and an expansion valve (not shown), and an evaporator are sequentially connected by a refrigerant pipe to circulate the refrigerant. Both condenser and evaporator functions can be reversed. Then, one of the condenser and the evaporator, for example, the evaporator is provided with a heat exchange pipe 21b so that heat can be exchanged.

  Next, the operation of the LPG collection / reproduction device 1A will be described.

  First, as shown in FIG. 4, the outer end of the outlet pipe 2 a of the bulk storage tank 2 is connected to the gas inlet pipe 3 a of the recovery tank 3 through the connection pipe 4, and the on-off valve 2 c of the bulk storage tank 2 and the recovery tank 3 are connected. The on-off valve 3b, the electric valve 8e and the manual valve 8f of the flow rate pressure control device 8 are opened. Then, LPG in the bulk storage tank 2 is sucked by the negative pressure of the recovery tank 3 and recovered into the recovery tank 3. At the time of recovery of this LPG, the water circulating in the heat exchange pipe 20d of the heat exchange pipe 20 and the heating jacket 18 in the heating device 20 is heated in the heat exchange pipe 20 by the circulation pump Pa, and the heating jacket is used as hot water. Since the inside of the heating pipe 18b flows through the 18 inlet end portions 18c, the outer surface of the bulk storage tank 2 can be heated.

  On the other hand, the hot water cooled by the bulk storage tank 2 by the heating of the bulk storage tank 2 by the heating jacket 18 is lowered and returned to the heating device 20 through the outlet end 18d and the inlet pipe 20b. Heated again by the heating device 20 in the exchange tube 20c. The water heated here becomes warm water again, is sent again to the heat exchange pipe 18b of the heating jacket 18 by the circulation pump Pa, and is circulated to repeatedly heat the bulk storage tank 2.

  For this reason, since the vaporization of LPG in the bulk storage tank 2 is promoted, the recovery efficiency of the LPG vapor phase by the recovery device 3 can be improved. In particular, when the outside air temperature is low such as in winter, the effect of improving the recovery efficiency is remarkable.

  On the other hand, the cooling / heating device 21 is operated in the cooling mode when LPG is recovered, and cools the water in the heat exchange pipe 21b in the main body case 21a by the evaporator of the refrigeration cycle device. This cooling water is circulated in the tank heat exchange pipe 19 through the outlet pipe 22a and the inlet end 19b of the recovery tank 3 in order by the circulation pump Pb. For this purpose, the activated carbon 7 which generates heat by adsorbing the gas phase of LPG is cooled by the in-tank heat exchange pipe 19 and the fins 19a, 19a,. Thereby, the LPG adsorption capacity of the activated carbon 7 can be improved again.

  On the other hand, the chilled water heated by the heat exchange during the cooling of the activated carbon 7 is returned to the heat exchange pipe 21b in the cooling / heating device 21 again through the outlet end 9c and the inlet pipe 22b by the circulation pump Pb. Here, it is cooled again by the evaporator of the refrigeration cycle apparatus (not shown) and circulated through the heat exchange pipe 19 in the tank, so that the activated carbons 7, 7,.

  The heating efficiency of the cooling / heating device 21 can be improved by using the heat generated by the condensation generated during the cooling mode operation for heating the heating device 20.

  When the LPG recovered in the recovery tank 3 is returned to the filling storage tank 9 as shown in FIG. 3, the four-way valve of the refrigeration cycle of the cooling / heating device 21 shown in FIG. 4 is switched to the heating operation mode. Then, the hot water heated by the evaporator of the refrigeration cycle apparatus circulates in the in-tank heat exchange pipe 19 in the recovery tank 3, and the activated carbons 7, 7, ... can be heated. As a result, the LPG release efficiency of the activated carbon 7, 7,... Can be improved, and the inside of the recovery tank 3 can be heated to improve the vaporization of LPG, so that the recovery tank 3 enters the filling storage tank 9. The efficiency of returning LPG, that is, the reproduction efficiency can be improved.

  The cooling / heating device 21 is configured to be integrated with a heat pump refrigeration cycle apparatus having a four-way valve that cools water as a cooling / heating medium circulating in the tank heat exchange pipe 19 while heating. As described above, the present invention is not limited to this. For example, a cooling device such as a chiller refrigeration device and a heating device such as an electric heater are provided separately, and circulate in the heat exchange pipe 19 in the tank. You may comprise so that the water channel which guides circulating water to a cooling device and a heating device, respectively, can be switched.

  That is, when the activated carbon 7 is cooled during LPG recovery, the water channel circulating in the tank heat exchange pipe 19 is switched to the cooling device side to cool the water. Further, when the activated carbon 7 is heated during regeneration of the LPG, the water channel circulating in the tank heat exchange pipe 19 is switched to the heating device side to heat the water. In the case of such a configuration, this heating device can be shared by the heating device 20 for the bulk storage tank 2.

  Furthermore, in the heating apparatus 20, the case where the heat exchange pipe 18b is embedded in the heating jacket 18 has been described. However, instead of the heat exchange pipe 18b, a heating wire is embedded, and the heating wire is energized and heated. It may be configured.

  FIG. 5 is a schematic diagram of a main part of a recovery apparatus 1B according to the third embodiment of the present invention. This recovery apparatus 1B is the recovery apparatus 1 according to the first embodiment, wherein the outlet pipe 2a of the bulk storage tank 2 is extended to the vicinity of the inner bottom of the bulk storage tank 2 and the liquid phase of LPG can be discharged. The main feature is that the distribution pipe 6 of the recovery tank 3 is replaced with a cooling distribution pipe 61 in addition to the replacement with 2d. Other configurations are substantially the same as those of the LPG recovery apparatus 1 described above. For example, the recovery tank 3 is decompressed to a vacuum or the like, and a large number of activated carbons 7, 7,.

  The cooling distribution pipe 61 has an inverted T-shaped main pipe 61a connected to the inner end of the inlet pipe 3a of the recovery tank 3, and an axial direction at the upper end in FIG. 5 of the horizontal pipe 61b of the main pipe 61a. A plurality of mist nozzles 61c, 61c, which are arranged at a required pitch, a plurality of inverted U-shaped pipes 61d arranged for each of the mist nozzles 61c, and the inverted U-shaped pipes 61d, respectively. Fins 61e are provided.

  The mist nozzle 61c is disposed in each LPG discharge hole formed at a predetermined pitch in the axial direction at the upper end portion of the horizontal tube portion 61b, and the liquid phase of the LPG is placed in each inverted U-shaped tube 61d. It is blown out with a mist (mist).

Each inverted U-shaped tube 61d is bent in a substantially inverted U shape, and _{one of} the pair of left and right vertical tubes 61d ₁ , 61d ₂ in FIG. 5, for example, the open end of 61d ₁ is connected to each mist nozzle. It is fixed in a concentric state on 61c. Further, on the outer surface of the vertical pipe portion 61d ₁ of this one, it is fixed to the fins 61e of the plate-like required shape. The other vertical pipe portion 61d _2, a plurality of LPG gas discharge holes 61f, 61f, ... were respectively bored.

  Therefore, first, one end (the left end in FIG. 5) of the connecting pipe 4 is connected to the outer end of the extending outlet pipe 2d of the bulk storage tank 2 by the coupling C or the like, and the other end of the connecting pipe 4 is connected to the recovery tank. 3 is connected to the outer end of the inlet pipe 3a by a coupling C or the like, and both the on-off valve 2e of the outlet pipe 2d for drawing and the on-off valve 3b of the inlet pipe 3a are opened.

  Then, since the collection tank 3 side is depressurized to a negative pressure, the liquid phase of LPG in the bulk storage tank 2 sequentially passes through the outlet pipe 2d for extension, the connection pipe 4, and the inlet pipe 3a of the collection tank 3 in this order in an inverted T shape. Into the cooling distribution pipe 61.

For this purpose, the liquid phase of LPG is discharged from each mist nozzle 61c of the cooling distribution pipe 61 into a mist (mist) in _one vertical pipe portion 61d1 of each inverted U-shaped pipe 61d. Therefore, these vertical pipe portion 61d ₁ is cooled by the latent heat of vaporization of LPG in the liquid phase is cooled fins 61e, vaporized gas phase from the other discharge hole 61f of the vertical pipe portion 61d ₂ into the collection tank 3 Is released and adsorbed by the activated carbon 7, 7,..., And the adsorbed state is maintained.

The activated carbon 7 generates heat and rises in temperature when adsorbing and holding LPG, but is cooled by one of the vertical pipe portions 61d ₁ and the fins 61e of the inverted U-shaped tube 61, so that a decrease in adsorption capacity is suppressed or prevented. Can do.

  When almost all of the LPG liquid phase in the bulk storage tank 2 is recovered in the recovery tank 3, the LPG gas phase remaining in the recovery tank 3 is now passed through the connection pipe 4 and the cooling distribution pipe 61. Then, it is recovered into the recovery tank 3. After this recovery, the on-off valve 2e of the bulk storage tank 2, the on-off valve 3b of the recovery tank 3, the electric valve 8e of the flow pressure control device 8 and the manual valve 8f are fully closed.

  FIG. 6 is a schematic diagram of a main part of a recovery apparatus 1C according to the fourth embodiment of the present invention. The recovery apparatus 1C is provided with a liquid recovery tank 31 made of steel or the like for recovering the LPG liquid phase exclusively in addition to the gas phase recovery tank 3 shown in FIG. 1, FIG. 4, and FIG. The point has the main characteristics.

  The liquid recovery tank 31 is provided with a liquid outlet pipe 31a communicating with the vicinity of the inner bottom thereof, a liquid opening / closing valve 31b for opening and closing the liquid outlet pipe 31a, and a liquid pump 31c interposed in the liquid outlet pipe 31a. The liquid outlet pipe 31a, the liquid on-off valve 31b, and the liquid pump 31c may be provided in advance in the rotor wheel 5 in order to fill the LPG in the lorry wheel 5 into the bulk storage tank 2. In addition, the liquid recovery tank 31 is provided with a wave-breaking partition wall and partition walls for partitioning the liquid phase of the recovered LPG into a plurality of cells. Thus, the generation of large waves on the liquid surface is suppressed. However, the dispersion pipe 6 and the activated carbon 7, 7,.

  Therefore, according to this recovery device 1C, first, one end portion (the left end portion in FIG. 6) of the connecting pipe 4 is connected to the outer end portion of the liquid outlet pipe 2d of the bulk storage tank 2 by a required joint such as a connecting flange F, The other end of the connection pipe 4 is connected to the outer end of the discharge port of the liquid pump 31c of the liquid recovery tank 31 by a required joint F.

  Thereafter, the liquid on / off valve 2e of the bulk storage tank 2 and the liquid on / off valve 31b of the liquid recovery tank 31 are opened, and then the liquid pump 31c is reversely rotated in the reverse direction to the LPG filling. Then, the liquid phase of LPG in the bulk storage tank 2 is sucked by the liquid pump 31c, moves into the liquid recovery tank 31, and is recovered.

  After the LPG liquid phase in the bulk storage tank 2 is recovered in the recovery tank 3 in this way, the liquid on-off valve 2e of the bulk storage tank 2 and the liquid on-off valve of the liquid recovery tank 31 are fully closed. Thereafter, the left end of the connecting pipe 4 in FIG. 6 is connected to the flange F or the like at the outer end of the gas phase outlet pipe 2 a of the bulk storage tank 2, while the right end of the connecting pipe 4 is connected to the inlet of the gas recovery tank 3. The gas phase of LPG remaining in the bulk storage tank 2 connected to the outer end of the pipe 3a is recovered again into the gas phase recovery tank 3 by the above-described procedure.

  Therefore, according to the recovery device 1C, the liquid phase of LPG in the bulk storage tank 2 is recovered by the liquid recovery tank 31, and thus a large amount of LPG can be recovered in a short time without vaporizing the liquid phase. For this reason, it is not necessary to heat the bulk storage tank 2 to vaporize the liquid phase.

  Moreover, since the gas phase remaining in the bulk storage tank 2 is recovered by the gas phase recovery tank 3 after the liquid phase of the LPG is recovered, most of the LPG in the bulk storage tank 2 can be recovered. For this reason, both the liquid recovery tank 31 and the vapor phase recovery tank 3 can be miniaturized. Further, the liquid pump 31c may be provided in advance in the lorry wheel 5 as a liquid pump for liquid phase filling, so that it is not necessary to newly provide the liquid pump 31c, and the cost can be reduced accordingly. However, the inside of the liquid recovery tank 31 may be previously decompressed to a vacuum or the like, and according to this, the liquid pump 31c can be omitted.

The principal part schematic diagram of the collection | recovery apparatus which concerns on the 1st Embodiment of this invention. The block diagram which shows the structure of the flow-pressure control apparatus shown in FIG. The schematic diagram which shows the process of collect | recovering (reproducing | regenerating) LPG to the storage tank for filling with the collection | recovery apparatus shown in FIG. The schematic diagram of the collection | recovery apparatus which concerns on the 2nd Embodiment of this invention. The schematic diagram of the collection | recovery apparatus which concerns on the 3rd Embodiment of this invention. The schematic diagram of the collection | recovery apparatus which concerns on the 4th Embodiment of this invention.

Explanation of symbols

1, 1A, 1B, 1C Recovery device 2 Bulk storage tank 2a Bulk storage tank outlet pipe 2b Bulk storage tank body 2c Bulk storage tank opening / closing valve 3 Recovery tank 3a Recovery tank inlet pipe 3b Recovery tank switching valve 4 Connection pipe 5 Raleigh Car 6 Dispersion pipe 6a Main pipe 6b Branch pipe 6c Release hole 7 Activated carbon 8 Flow rate pressure control device 9 Filling tank 10 Regeneration device 12 Gas compressor 13 Loading arm 14 Liquid recovery pipe 15 Balance tank 16 Vacuum pump 17 Connection pipe 18 Heating jacket 18a Heating jacket main body 19 In-tank heat exchange tube 19a Fin 19b Inlet end 19c in tank heat exchange tube Outlet end 20 in tank heat exchange tube Heating device 20a Outlet end 20b in heating device Inlet end 21 in heating device Heating Cooling device 31 Liquid recovery tank 61 Cooling dispersion pipe 61a Cooling dispersion pipe Main pipe 61b Horizontal pipe portion 61c for cooling dispersion pipe Mist nozzle 61d Reverse U-shaped pipe 61e Fin

Claims (10)

A recovery container depressurized to a negative pressure that is detachably connected to a closed space containing liquefied petroleum gas via a connecting pipe;
An adsorbent that is accommodated in the recovery container and adsorbs the liquefied petroleum gas so as to be released;
A flow rate pressure control means for controlling the flow rate of the liquefied petroleum gas recovered from the closed space to the recovery vessel, and for controlling the closed space to a negative pressure equal to or higher than the negative pressure of the recovery vessel;
The LPG collection | recovery apparatus characterized by comprising. The LPG recovery apparatus according to claim 1, wherein the adsorbent is activated carbon, and includes a cooling device that cools the activated carbon and a heating device that heats the closed space. The collection container includes a branch pipe connected to one end of the connection pipe and having a plurality of branch pipes dispersed in the collection container, and a dispersion pipe having a plurality of discharge holes formed in the branch pipes. The LPG recovery apparatus according to claim 1 or 2, wherein The dispersion pipe includes a mist nozzle that is connected to the connection pipe and mists the liquid phase upstream of the discharge hole, and a heat exchange fin that is connected to the mist area. The LPG recovery apparatus according to claim 3. 4. A liquid component recovery container connected to the closed space via the connecting pipe and decompressed to a negative pressure for sucking and recovering a liquid phase of liquefied petroleum gas is provided. The LPG collection | recovery apparatus of any one of these. A liquid recovery container that is connected to the closed space via the connecting pipe and mainly stores the liquid phase of the liquefied petroleum gas in the closed space;
A liquid pump for pumping the liquid phase of the liquefied petroleum gas in the closed space to the liquid collection container;
The LPG recovery device according to any one of claims 1 to 4, wherein the LPG recovery device is provided. The LPG recovery apparatus according to claim 1, wherein the closed space is a bulk storage tank. The LPG recovery device according to any one of claims 1 to 7,
A regenerator that pumps and stores the liquefied petroleum gas recovered by the LPG recovery device in a gas-filling storage tank that stores the liquefied petroleum gas in order to fill the filling container;
An LPG reproducing apparatus comprising: The regenerator includes a second connection pipe that is detachably connected to the collection container, a communication path that is connected to the second connection pipe and communicates with the gas filling storage tank, and is interposed in the communication path. A pump that sucks liquefied petroleum gas from a recovery container, a balance tank that temporarily stores liquefied petroleum gas sucked by this pump, and a reversible pump that pressurizes the liquefied petroleum gas in the balance tank and pumps it to the gas filling storage tank compressor,
The LPG reproducing apparatus according to claim 8, comprising: The LPG regeneration apparatus according to claim 9, wherein the pump is an ejector pump driven by liquefied petroleum gas.

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