JP5924487B2 - Volatile organic compound recovery device and volatile organic compound treatment system - Google Patents

Description

  In the present invention, the volatile organic compound of the untreated gas containing the volatile organic compound is adsorbed on an adsorbent, for example, activated carbon, and the volatile organic compound adsorbed on the activated carbon is desorbed and recovered by water vapor. The present invention relates to a volatile organic compound recovery device and a volatile organic compound treatment system used in the above.

  Conventionally, as a volatile organic compound collection | recovery apparatus as mentioned above, there exist some which were described in patent document 1, for example.

  This volatile organic compound recovery apparatus includes an adsorption tower containing an adsorbent. In this adsorption tower, an untreated gas containing a volatile organic compound such as toluene or xylene is introduced into the tower, and the volatile organic compound contained in the untreated gas is adsorbed to the adsorbent at normal temperature and pressure. Adsorption treatment for removing volatile organic compounds from the untreated gas is performed.

  Further, in this adsorption tower, following the above-described adsorption treatment, a heating and pressurizing process is performed in which water vapor is introduced into the tower to raise both the temperature and the pressure. A desorption process is performed in which water vapor is introduced into the tower whose pressure has been increased to desorb the volatile organic compound from the adsorbent, and the water vapor mixed with the volatile organic compound is sent to, for example, a combustor of a gas turbine. It has become.

  In addition, in the adsorption tower, a depressurization process such as lowering the pressure in the tower is performed as a process from the desorption process to returning to the adsorption process again by releasing water vapor remaining in the tower into the atmosphere as a treated gas. It has become so.

  In this volatile organic compound recovery device, a plurality of adsorption towers are provided, and the above-described adsorption, heating / pressurization, desorption and decompression processes in each adsorption tower are controlled so as not to overlap each other in one cycle. Thus, the recovery of the volatile organic compound is continuously performed.

International Publication No. 2006/019131

  Here, the volatile organic compound recovery device described above is used for recovering the volatile organic compound from the untreated gas and sending it to the combustor of the gas turbine, for example, that is, the recovered volatile organic compound is gasified. Since it is used to realize energy saving that it is reused as fuel for turbines, it is contrary to energy saving to release water vapor (pressurized gas) remaining in the tower to the atmosphere during decompression processing in the adsorption tower. Thus, solving this problem has been a conventional problem.

  The present invention has been made paying attention to the above-described conventional problems, and it is possible to realize energy saving by recovering the volatile organic compound from the untreated gas and making it reusable. Another object of the present invention is to provide a volatile organic compound recovery device and a volatile organic compound treatment system capable of obtaining a further energy saving effect.

  In the invention according to claim 1 of the present invention, the volatile organic compound of the raw gas containing the volatile organic compound is adsorbed on an adsorbent, for example, activated carbon, and the volatile organic compound adsorbed on the activated carbon is vaporized. A volatile organic compound recovery device that recovers a volatile organic compound from the untreated gas by desorption by a plurality of adsorption towers that contain the adsorbent, and water vapor that supplies water vapor to the plurality of adsorption towers A supply line and a decompression line for guiding the pressurized gas discharged from the plurality of adsorption towers to the water vapor supply line, respectively, in the plurality of adsorption towers, adsorption treatment, heating and pressure treatment, desorption in one cycle Each of the treatment and the decompression treatment is performed in order, and the heating and pressurization treatment and the decompression treatment in any two adsorption towers are always performed in synchronization with each other in one cycle. In addition, a pressurizing and mixing unit that operates using the steam supplied by the steam supply line as a driving gas is installed at a connection portion between the steam supply line and each decompression line from the plurality of adsorption towers. The suction gas remaining in the tower is sucked from the adsorption tower performing the decompression process after the desorption process through the decompression line, mixed with the steam supplied by the steam supply line, and the decompression process is performed. The volatile organic compound recovery device with this configuration solves the conventional problems. As a means for.

  Moreover, the volatile organic compound collection | recovery apparatus which concerns on Claim 2 of this invention is set as the structure by which the ejector is used as said pressure | voltage rise mixing means.

  Furthermore, the volatile organic compound recovery apparatus according to claim 3 of the present invention includes a turbine that is rotationally driven by water vapor supplied from the water vapor supply line, and an adsorption tower that is rotationally driven by the turbine to perform pressure reduction processing. A compressor that sucks and compresses the residual pressurized gas in the tower through a decompression line, and mixes the water vapor that has passed through the turbine and the residual pressurized gas in the tower that has been pressurized by the compressor. A turbine mechanism that is introduced into the adsorption tower that is performing the heating and pressurizing process after the adsorption process in synchronization with the adsorption tower that is performing the decompression process is used as the pressurizing and mixing means.

  On the other hand, the volatile organic compound processing system according to claim 4 of the present invention burns the volatile organic compound recovery device according to claim 1 and the volatile organic compound recovered by the volatile organic compound recovery device. The configuration includes a combustor.

  In the volatile organic compound recovery apparatus according to the present invention, in each of the plurality of adsorption towers, the adsorption process, the heating and pressurizing process, the desorption process, and the depressurizing process are sequentially performed so as not to overlap each other. Therefore, the recovery of the volatile organic compound is continuously performed.

  During this one cycle, the heating and pressurizing process and the depressurizing process in any two adsorption towers are always performed in synchronization with each other, so that they remain in the adsorption tower that is performing the depressurizing process after the desorption process. When the pressurized gas is introduced into the adsorption tower performing the heating and pressurizing treatment after the adsorption treatment in synchronization with the adsorption tower performing the decompression treatment, that is, for both adsorption towers. When the so-called pressure equalization process is performed, the adsorption tower performing the decompression process is depressurized to about half the pressure at the start of decompression, while the adsorption tower performing the heating and pressurizing process is approximately half the target pressure. It will be pressurized to the pressure of.

  At this time, by the operation of the pressurizing and mixing means using the steam supplied by the steam supply line as the driving gas, the residual pressurized gas in the tower is sucked from the adsorption tower performing the decompression process through the decompression line, and the steam supply line Is mixed with the water vapor supplied by, and introduced into the adsorption tower performing the heating and pressurizing treatment.

  That is, more than half of the residual pressurized gas at the start of decompression is forcibly transferred from the adsorption tower performing the decompression process to the adsorption tower performing the warming and pressurization process. In the adsorption tower performing the warming and pressurizing process, the amount of pressurizing gas introduced from the outside can be reduced to obtain the target pressure.

  Therefore, in the volatile organic compound processing system according to the present invention, a further energy saving effect can be obtained.

  Further, in the volatile organic compound recovery device according to the present invention, as described above, when the ejector is employed as the pressure mixing means, it is possible to contribute to energy saving with a simple configuration, while the turbine mechanism is used as the pressure mixing means. In this case, efficient pressurization and mixing of the residual pressurized gas in the tower from the adsorption tower performing the depressurization treatment and the steam supplied from the steam supply line is performed. When a turbine mechanism is employed as the mixing means, the turbine may be driven to rotate by a motor.

  Since the volatile organic compound recovery apparatus according to the present invention has the above-described configuration, it goes without saying that energy can be saved by recovering the volatile organic compound from the untreated gas and making it reusable. Thus, it is possible to obtain a very excellent effect that it is possible to obtain a further energy saving effect.

It is a schematic structure explanatory view showing a volatile organic compound processing system which has a volatile organic compound recovery device concerning one embodiment of the present invention. It is time schedule explanatory drawing in 1 process cycle of the volatile organic compound collection | recovery apparatus shown in FIG. FIG. 5 is an open / close state explanatory view of a valve when pressure equalization is performed between the first adsorption tower and the third adsorption tower of the volatile organic compound recovery apparatus shown in FIG. 1. FIG. 4 is an open / close state explanatory diagram of a valve when pressure reduction / pressure treatment is performed between the first adsorption tower and the third adsorption tower of the volatile organic compound recovery apparatus shown in FIG. 1. It is opening-and-closing state explanatory drawing at the time of the 1st adsorption tower of the volatile organic compound collection | recovery apparatus shown in FIG. 1 performing the pressure release process. FIG. 1A is an enlarged explanatory view of the valve open / close state during pressure equalization between the first adsorption tower and the third adsorption tower of the volatile organic compound recovery apparatus shown in FIG. It is an enlarged explanatory view (b) and an enlarged explanatory view (c) of the valve opening and closing state during the pressure release process. It is expansion explanatory drawing of the valve opening-and-closing state at the time of the pressure reduction and pressurization process between the 1st adsorption tower and the 3rd adsorption tower which show the volatile organic compound recovery device concerning other embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a volatile organic compound processing system in which a volatile organic compound recovery apparatus according to the present invention is employed. This volatile organic compound processing system includes a volatile organic compound recovery apparatus 1 and combustion of a gas turbine. And a water vapor generator (not shown).

  The volatile organic compound recovery device 1 adsorbs a volatile organic compound of an untreated gas containing a volatile organic compound to an adsorbent, for example, activated carbon, and the volatile organic compound adsorbed on the activated carbon is subjected to a pressurized environment. The volatile organic compound is recovered from the untreated gas by desorption with steam.

  Specifically, this volatile organic compound recovery apparatus 1 supplies seven adsorption towers 11 to 17 containing an adsorbent and the water vapor generated by the water vapor generation unit to the adsorption towers 11 to 17 side. Water vapor is supplied to the water vapor supply line 3, the decompression lines 31 to 37 that lead the pressurized gas discharged from the adsorption towers 11 to 17 to the water vapor supply line 3, respectively, and the water vapor supply line 3 to each of the adsorption towers 11 to 17. Pressurized lines 51 to 57 to be supplied and a processed gas discharge line 4 connected to the adsorption towers 11 to 17 are provided.

  The supply valve 2 is disposed in the water vapor supply line 3, the decompression valves 21 to 27 are disposed in the plurality of decompression lines 31 to 37, and the pressurization valves 41 to 27 are disposed in the pressurization lines 51 to 57, respectively. 47 are arranged, and exhaust valves 61 to 67 are arranged between the treated gas discharge line 4 and the adsorption towers 11 to 17, respectively.

  Further, as shown by a one-dot chain line in FIG. 1, an untreated gas containing a volatile organic compound is introduced into each of the seven adsorption towers 11 to 17 through a control valve (not shown). As indicated by chain lines, the compound adsorbed water vapor described later is sent from the seven adsorption towers 11 to 17 to the combustor 9 through a combustor valve (not shown).

  In the seven adsorption towers 11 to 17, as shown in FIG. 2, the adsorption process, the heating and pressurizing process, the desorption process, and the depressurizing process are sequentially performed in one cycle so as not to overlap each other. To be implemented.

  Here, when the adsorption process is performed in the adsorption towers 11 to 17, for example, as shown in FIGS. 3 to 5, the adsorption process is performed in the adsorption towers 14 to 17 during one cycle of the unit time T3. In this case, all of the valves 24 to 27, 44 to 47, and 64 to 67 surrounding the adsorption towers 14 to 17 are closed, while the desorption process is performed in the second adsorption tower 12 during one cycle of T3. In this case, all of the valves 22, 42 and 62 surrounding the second adsorption tower 12 are closed except for the combustor valve and the desorption steam valve (not shown).

  Furthermore, in this volatile organic compound recovery apparatus 1, any one of the two adsorption towers in one cycle, for example, the decompression process in the first adsorption tower 11 and the third adsorption tower 13 in one cycle of unit time T3 are used. These heating and pressurization processes are performed in synchronization with each other.

  In this embodiment, as shown in FIG. 3, the pressurized gas remaining in the first adsorption tower 11 performing the decompression process after the desorption process is used for the first adsorption tower 11 performing the decompression process. Is introduced into the third adsorption tower 13 that is performing the heating and pressurizing treatment after the adsorption treatment, that is, so-called pressure equalization treatment is performed on both adsorption towers 11 and 13. Yes.

  In this case, water vapor supplied from the water vapor supply line 3 is connected to the downstream side of the supply valve 2 on the water vapor supply line 3 and the connection parts of the decompression lines 31 to 37 from the seven adsorption towers 11 to 17. An ejector (pressurizing and mixing means) 8 that operates as a driving gas is installed.

  As shown in FIG. 4, the ejector 8 sucks the residual pressurized gas in the tower from the first adsorption tower 11 performing the pressure reduction process following the pressure equalization process via the pressure reduction valve 21 and the pressure reduction line 31. The water vapor is then mixed with the water vapor supplied through the supply valve 2 in the open state by the water vapor supply line 3.

The ejector 8 then applies the pressurized line 53 and the open state of the mixed flow of the residual pressurized gas and water vapor to the third adsorption tower 13 that is performing the heating and pressurizing process following the pressure equalizing process. The pressure is introduced through the pressure valve 43.
In this embodiment, as shown in FIG. 5, in the first adsorption tower 11 performing the decompression process, a pressure release process for opening the discharge valve 61 is performed following the decompression process. It has become.

  In the volatile organic compound recovery apparatus 1 described above, in each of the seven adsorption towers 11 to 17, the adsorption process, the heating and pressurizing process, the desorption process, and the depressurizing process are sequentially performed and do not overlap each other. Thus, the recovery of the volatile organic compound is continuously performed.

  In one cycle, any two adsorption towers, for example, in one cycle of unit time T3, the depressurization process in the first adsorption tower 11 and the heating and pressurization process in the third adsorption tower 13 are synchronized with each other. Therefore, as shown in FIG. 6 (a), both the decompression valve 21 and the pressurization valve 43 are opened, and the pressurized gas after the desorption treatment in the first adsorption tower 11 is If it flows into the 3rd adsorption tower 13 of the normal temperature normal pressure which is performing the heating pressurization process after adsorption processing synchronizing with the 1st adsorption tower 11 which is performing this decompression processing, that is, both adsorption If the so-called pressure equalization process is performed on the towers 11 and 13, the first adsorption tower 11 performing the decompression process is decompressed to about half the pressure at the start of decompression, while the heating and pressurizing process is performed. In the third adsorption tower 13, the pressure is increased to about half the target pressure. The it is.

  Thus, when the pressure in the 1st adsorption tower 11 and the pressure in the 3rd adsorption tower 13 become substantially uniform, as shown also in Drawing 6 (b), it is for supply of water vapor supply line 3 When the valve 2 is opened, water vapor acts as a driving fluid for the ejector 8, and the operation of the ejector 8 sucks the residual pressurized gas in the tower from the first adsorption tower 11 performing the decompression process through the decompression line 31. Then, it is mixed with the water vapor supplied from the water vapor supply line 3 and flows into the third adsorption tower 13 performing the heating and pressurizing process through the pressure line 53.

  That is, from the first adsorption tower 11 performing the decompression process, more than half of the residual pressurized gas at the start of the decompression is forcibly transferred to the third adsorption tower 13 performing the heating and pressurization process. Thus, in the third adsorption tower 13 that performs this warming and pressurization process by that amount, the amount of pressurizing gas introduced from the outside can be reduced to obtain the target pressure.

  Thereafter, when the pressurization of the third adsorption tower 13 is completed, as shown in FIG. 6C, the supply valve 2, the pressure reducing valve 21, and the pressure increasing valve 43 are all closed and the discharge valve 61 is closed. When the pressure release process is performed by opening only the gas, the remaining pressurized gas in the first adsorption tower 11 is released to the atmosphere.

  Therefore, in the volatile organic compound processing system having the volatile organic compound recovery apparatus 1 described above, a further energy saving effect can be obtained.

  Moreover, in the above-described volatile organic compound recovery apparatus 1, since the ejector 8 is employed as the pressure mixing means, it is possible to contribute to energy saving with a simple configuration.

  The configurations of the volatile organic compound recovery device and the volatile organic compound processing system according to the present invention are not limited to the configurations of the above-described embodiments, and other configurations, for example, as shown in FIG. The turbine mechanism 80 can be employed as the pressure mixing means of the organic organic compound recovery apparatus 1.

  The turbine mechanism 80 is connected to a turbine 81 that is rotationally driven by water vapor supplied from the water vapor supply line 3, and is connected to the turbine 81 via a shaft 82. The turbine mechanism 80 is rotationally driven by the turbine 81 to perform pressure reduction processing. A compressor 83 that sucks and compresses the pressurized gas remaining in the tower from the first adsorption tower 11 via the decompression line 31 is provided.

  And in this turbine mechanism 80, efficient pressure | voltage rise mixing of the water vapor | steam supplied by the residual pressure gas in the tower | column from the 1st adsorption tower 11 which is performing the pressure reduction process, and the water vapor | steam supply line 3 is made. Thus, when the turbine mechanism 80 is employed as the pressure mixing means, the turbine 81 may be driven to rotate by a motor.

1 Volatile Organic Compound Recovery Device 3 Steam Supply Line 8 Ejector (Pressure Mixing Means)
9 Combustors 11 to 17 Adsorption towers 31 to 37 Decompression line 80 Turbine mechanism 81 Turbine 83 Compressor

Claims (4)

The volatile organic compound of the untreated gas containing the volatile organic compound is adsorbed on an adsorbent, and the volatile organic compound adsorbed on the adsorbent is desorbed by water vapor to thereby remove the volatile organic compound from the untreated gas. A volatile organic compound recovery device for recovering a compound,
A plurality of adsorption towers containing the adsorbent;
A steam supply line for supplying steam to the plurality of adsorption towers;
A decompression line for guiding the pressurized gas discharged from the plurality of adsorption towers to the water vapor supply line,
In each of the plurality of adsorption towers, the adsorption treatment, the heating and pressurization treatment, the desorption treatment, and the decompression treatment are sequentially performed during one cycle, and the adsorption in any two adsorption towers is always performed during one cycle. The hot pressurization process and the decompression process are performed in synchronization with each other,
At the connection site between the water vapor supply line and each decompression line from the plurality of adsorption towers, a pressure mixing means that operates using water vapor supplied from the water vapor supply line as a driving gas is installed,
The pressure mixing means sucks residual pressurized gas in the tower through a pressure reducing line from an adsorption tower that performs pressure reduction processing after desorption processing, mixes it with water vapor supplied by the water vapor supply line, and A volatile organic compound recovery device, wherein the volatile organic compound recovery device is introduced into an adsorption tower that is performing a heating and pressurizing treatment after the adsorption treatment in synchronization with the adsorption tower that is performing the treatment.   The volatile organic compound recovery apparatus according to claim 1, wherein an ejector is used as the pressurizing and mixing unit.   A turbine that is rotationally driven by water vapor supplied from the water vapor supply line, and an adsorption tower that is rotationally driven by the turbine and performing pressure reduction treatment, sucks and compresses residual pressurized gas in the tower through the pressure reduction line. A compressor is provided, mixed with water vapor that has passed through the turbine and residual pressurized gas in the tower pressurized by the compressor, and after the adsorption treatment in synchronization with the adsorption tower performing the decompression treatment The volatile organic compound recovery apparatus according to claim 1, wherein a turbine mechanism that is introduced into an adsorption tower that is performing a heating and pressurizing process is used as the pressurizing and mixing unit. The volatile organic compound recovery device according to claim 1;
A volatile organic compound treatment system comprising a combustor for burning a volatile organic compound recovered by the volatile organic compound recovery device.

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