JP2019098220A - Device for collecting and discharging carbon dioxide - Google Patents

Abstract

To supply a gas including high-concentration carbon dioxide to external equipment by efficiently enhancing the content of carbon dioxide in introduced outdoor air in spite of simple device configuration.SOLUTION: There is provided a collection/discharge device for carbon dioxide including concentration of carbon dioxide in introduced outdoor air and discharge of the carbon dioxide to external equipment. The device comprises: a suction part prepared by laminating the suction unit in which a heater is installed around a zeolite-stored air-permeable container; a major portion storing a suction part; a blower unit introducing outdoor air to send it to the suction part; and a storage container connected to the major portion. After carbon dioxide is sucked by the zeolite by sending the outdoor air to the suction part by the blower unit for a prescribed time, the gas in the major portion is sent to the storage container by heating the zeolite by a heater to discharge the carbon dioxide, and then the gas in the storage container is discharged to external equipment.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a carbon dioxide recovery / release device that condenses the carbon dioxide in the outside air taken in and releases a gas containing carbon dioxide at a high concentration to an external facility.

  In the cultivation of agricultural crops and horticultural crops, cultivation in greenhouses such as vinyl houses is carried out for the purpose of temperature control and the like. However, the greenhouse is a sealed space, and it is feared that the carbon dioxide in the room is consumed for photosynthesis during the daytime, which adversely affects the growth of crops.

  Therefore, it is considered to supply carbon dioxide gas or a gas containing carbon dioxide at a high concentration into the greenhouse to increase the concentration of carbon dioxide in the room.

  For example, in patent document 1, after sending external air to the adsorption tower which accommodated the ferrierite which is 1 type of zeolite, making a ferrierite adsorb carbon dioxide, the inside of an adsorption tower is decompressed and carbon dioxide is released.

  In Patent Document 2, a fuel exhaust gas containing a high concentration of carbon dioxide is supplied to and adsorbed on zeolite, and then outside air having a carbon dioxide concentration lower than that of the fuel exhaust gas is supplied to the zeolite. It is releasing carbon dioxide.

  In Patent Document 3, the heat conductivity is made to flow outside air to a honeycomb structure provided with a large number of flow paths in which cell walls are formed of zeolite and in contact with the cell walls or embedded in the cell walls at the intersections of the cell walls. The filament heats and cools the individual flow paths to adsorb and release carbon dioxide.

Patent No. 6090810 Patent No. 6179915 gazette Patent No. 5904420

  However, in the method of reducing the pressure of the adsorption tower as in Patent Document 1, or in the method of releasing carbon dioxide from zeolite using the concentration difference of carbon dioxide as in Patent Document 2, the amount of carbon dioxide released is sufficient. There is a problem with efficiency. In addition, there is a problem that the time for releasing carbon dioxide from the zeolite also becomes long.

  In Patent Document 3, in order to manufacture a honeycomb structure, it is necessary to provide a heat conductive filament so as to be in contact with a cell wall, or to form a heat conductive filament at an intersection of the cell wall. The honeycomb structure becomes expensive.

  Therefore, it is an object of the present invention to efficiently increase captured carbon dioxide in the outside air and to supply a gas containing carbon dioxide at a high concentration to an external facility even with a simple device configuration.

In order to solve the above problems, the present invention provides the following carbon dioxide recovery / release apparatus.
(1) A carbon dioxide recovery and release device that condenses the carbon dioxide in the outside air taken in and releases a gas containing carbon dioxide at a high concentration to an external facility,
An adsorbing unit in which an adsorbing unit including a breathable container containing zeolite and a heater provided around the breathable container is stacked in multiple stages;
A main part housing the suction part,
A blower unit that takes in the outside air and sends it to the suction unit;
A storage container connected to the main part;
A first on-off valve attached to the main portion;
A second on-off valve attached to a pipe connecting the main part and the storage container;
A third on-off valve attached to a pipe connecting the storage container and the external facility;
When the first on-off valve is opened and the second on-off valve and the third on-off valve are closed, the outside air is sent to the adsorbing part by the air blowing unit for a predetermined time, and the zeolite in the outside air is oxidized After adsorbing carbon, the air blowing of the air blowing unit is stopped and the first on-off valve is closed.
Then, the zeolite is heated by the heater to release the carbon dioxide from the zeolite, and then the second on-off valve is opened to send the gas in the main part to the storage container.
Thereafter, the third on-off valve is opened to release the gas in the storage container to the external facility, and a carbon dioxide recovery / release apparatus.
(2) The apparatus for carbon dioxide recovery and release according to the above (1), wherein the zeolite is a pellet-like molding or a sheet-like molding.

  In the carbon dioxide recovery / release apparatus of the present invention, the adsorption unit contains zeolite in the air-permeable container and is heated by the heater around the adsorption unit, so a honeycomb having a heat conductive filament as disclosed in Patent Document 3 The structure is simple and easy to manufacture as compared with the structure. In addition, since the adsorbing portion is constituted by a plurality of adsorbing units, it is sufficient to replace only the adsorbing unit which is deteriorated in adsorbing ability or damaged, which is advantageous also in the maintenance cost.

  In addition, the method of releasing carbon dioxide adsorbed to zeolite also releases carbon dioxide more efficiently than the method of utilizing pressure difference as in Patent Document 1 or concentration difference as in Reference Document 2 in order to heat the zeolite. be able to.

It is the schematic which shows the whole structure of the collection / discharge | release apparatus of carbon dioxide of this invention. It is the schematic which shows an example (zeolite pellet use) of the adsorption unit of FIG. 1, (A) is the top view, (B) is AA sectional drawing of (A). It is the schematic which shows the other example (zeolite sheet use) of the adsorption unit of FIG. 1, (A) is the top view, (B) is AA sectional drawing of (A). It is explanatory drawing which shows the state which is blowing external air to the adsorption | suction part. It is an explanatory view showing a state where carbon dioxide is released from an adsorption part. It is explanatory drawing which shows the state which is transferring the gas in the main part to the storage container. It is explanatory drawing which shows the state which is releasing the gas in a storage container to external equipment.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing an entire configuration of a carbon dioxide recovery / release apparatus of the present invention. As shown, the main unit 2 accommodating the suction unit 1 therein, the blower unit 3 for supplying the outside air to the suction unit 1, and the storage container 4 connected to the main unit 2. In addition, external equipment is connected to the storage container 4.

  The adsorbing unit 1 is a multi-layered laminate of adsorbing units 1 a including an air permeable container 11 containing zeolite 10 and a heater 12 installed around the air permeable container 11. Further, in the suction unit 1, the plurality of suction units 1a are integrally stacked in a funnel-shaped outer frame 5, and the heaters 12 are provided outside the outer frame 5 for each suction unit 1a. There is.

  In the adsorption unit 1a, the breathable container 11 can be a metal mesh weir, a metal sieve or the like. The zeolite 10 may be either natural zeolite or synthetic zeolite. Further, as shown in FIG. 2, the zeolite 10 may be spread with the zeolite pellet 10 a appropriately open with a gap between the zeolite pellets 10 a as shown in FIG. 2, or the zeolite sheet 10 b folded as shown in FIG. You may store in The zeolite sheet 10b is a sheet of the zeolite 10 and has air permeability.

  As described later, since the wind pressure from the blower unit 3 acts on the adsorption unit 1a, when using the zeolite sheet 10b, the side wall of the air-permeable container 11 is pressed by the elastic recovery force at the time of folding. Preferably, it is in the form of an outwardly expanding fold. Alternatively, a weight having a size that does not inhibit the flow of outside air may be placed.

  As described above, since the adsorption unit 1 has a multi-stage configuration of the adsorption units 1a, it is only necessary to replace the adsorption unit 1a whose adsorption capacity is reduced or damaged, so that only one adsorption unit 1 is required. Maintenance costs can be reduced compared to when replacement is required.

  The main part 2 is an airtight container and is provided with a first on-off valve 20. The first on-off valve 20 can be provided, for example, at a position immediately above the suction portion 1 of the ceiling surface 2a as illustrated. Further, the bottom surface 2 b is provided with a pipe 30 connected to the storage container 4, and a second on-off valve 21 is provided in the middle of the pipe 30.

  The storage container 4 is an airtight container, and is provided with a third on-off valve 22 in the middle of the pipe 40 connected to the external equipment.

  The external equipment is not limited as long as it requires air having a high carbon dioxide concentration, and examples include vinyl greenhouses growing agricultural crops and horticultural crops.

  The following operations are performed to recover and release carbon dioxide from the open air using the above-described recovery and release device. First, as shown in FIG. 4, the second on-off valve 21 is closed and the first on-off valve 20 is opened. The outside air and the air flow in the device are indicated by white arrows in the figure (the same applies to the subsequent drawings), but the blower unit 3 is operated to take in the outside air and send the outside air from the bottom of the outer frame 5 to the adsorption part 1 . As described above, each adsorption unit 1a is configured by laying the zeolite pellet 10a in the air-permeable container 11 by opening a gap or folding the zeolite sheet 10b into the air-permeable container 11, so The sent outside air passes from the lowermost adsorption unit 1a (1) to the upper adsorption unit 1a one after another, and rises from the uppermost adsorption unit 1a (n) through the first on-off valve 20 It is released to the outside of part 2. Meanwhile, carbon dioxide in the air is adsorbed to the zeolite 10 (the zeolite pellet 10a and the zeolite sheet 10b) of each adsorption unit 1a.

  The outside air is blown by the blowing unit 3 for a predetermined time, and after the carbon dioxide of a certain amount is adsorbed to the theolite 10, the blowing unit 3 is stopped and the first valve 20 of the main part 2 is closed. Thereafter, the heater 12 is energized to heat the zeolite 10 of each adsorption unit 1a. The heating temperature is suitably about 60 to 180 ° C., and the heating time is suitably about 5 to 20 minutes. By this heating, the carbon dioxide adsorbed to the zeolite 10 is released from the zeolite 10 and retained around the zeolite 10.

  Next, as shown in FIG. 5, the blower unit 3 is operated for several seconds to several minutes to send the outside air to the adsorption unit 1 and send out the carbon dioxide staying around the zeolite 10 to the outside of the adsorption unit 1 together with the outside air. . Then, a mixed gas of carbon dioxide and the outside air passes through the space between the adsorption part 1 and the main part 2 and fills the bottom of the main part 2. The mixed gas of carbon dioxide and the outside air is obtained by adding the carbon dioxide released from the zeolite 10 to the carbon dioxide contained in the sent outside air, and contains carbon dioxide at a higher concentration than the outside air. There is.

  Then, as shown in FIG. 6, the second on-off valve 21 is opened to transfer the mixed gas to the storage container 4. A concentration meter (not shown) for carbon dioxide is attached to the storage container 4, and the above-mentioned adsorption and release process is repeated until the carbon dioxide concentration reaches a predetermined concentration threshold. As the concentration threshold, for example, 1000 to 2000 ppm suitable for promoting the growth of agricultural and horticultural crops is appropriate. That is, the carbon dioxide concentration of the outside air is about 400 ppm, and the carbon dioxide concentration released from the zeolite 10 is added to this to repeat the adsorption and release process until the carbon dioxide concentration in the storage container 4 becomes 1000 to 2000 ppm.

  Then, after the carbon dioxide concentration in the storage container 4 reaches the concentration threshold value, as shown in FIG. 7, the third on-off valve 22 is opened to send outside air from the blower unit 3, and the mixed gas accumulated in the storage container 4. Send out to external equipment. At this time, it is preferable to keep blowing until the carbon dioxide concentration of the storage container 4 becomes the same level as the carbon dioxide concentration of the outside air, and to send out all the mixed gas inside the storage container 4 to the external equipment. The required time is about several minutes.

  By performing the above-described series of operations, it is possible to recover carbon dioxide from the outside air and release a mixed gas containing carbon dioxide at a high concentration to an external facility.

  Although the storage container 4 and the external equipment are directly connected in the above, the mixed gas of the storage container 4 may be temporarily stored in another container, and the mixed gas may be supplied from the other container to the external equipment.

DESCRIPTION OF SYMBOLS 1 adsorption | suction part 1a adsorption | suction unit 2 main part 3 ventilation unit 4 storage container 10 zeolite 11 air-permeable container 12 heater 20 1st on-off valve 21 2nd on-off valve 22 3rd on-off valve

Claims (2)

A carbon dioxide recovery / discharge device that condenses the carbon dioxide in the outside air taken in and releases a gas containing carbon dioxide at a high concentration to an external facility,
An adsorbing unit in which an adsorbing unit including a breathable container containing zeolite and a heater provided around the breathable container is stacked in multiple stages;
A main part housing the suction part,
A blower unit that takes in the outside air and sends it to the suction unit;
A storage container connected to the main part;
A first on-off valve attached to the main portion;
A second on-off valve attached to a pipe connecting the main part and the storage container;
A third on-off valve attached to a pipe connecting the storage container and the external facility;
When the first on-off valve is opened and the second on-off valve and the third on-off valve are closed, the outside air is sent to the adsorbing part by the air blowing unit for a predetermined time, and the zeolite in the outside air is oxidized After adsorbing carbon, the air blowing of the air blowing unit is stopped and the first on-off valve is closed.
Then, the zeolite is heated by the heater to release the carbon dioxide from the zeolite, and then the second on-off valve is opened to send the gas in the main part to the storage container.
Thereafter, the third on-off valve is opened to release the gas in the storage container to the external facility, and a carbon dioxide recovery / release apparatus.   The apparatus for carbon dioxide recovery and release according to claim 1, wherein the zeolite is a pellet-like compact or a sheet-like compact.

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