JP2019155301A - Gas recovery concentration apparatus and gas recovery concentration method - Google Patents

Abstract

To provide a gas recovery concentration apparatus and method which need no heated air for desorbing an adsorbed gas.SOLUTION: The gas recovery concentration apparatus comprises a gas absorption part 11, a gas replacement part 12 and a steam desorption part. The gas absorption part 11 comprises an adsorption rotor 10 including an adsorbent capable of reversibly adsorbing steam and object gas other than the steam and having adsorbability with respect to the steam larger than that with respect to the object gas and supplies the adsorption rotor with gas-containing air including the object gas and causes the adsorbent to adsorb the object gas. The gas replacement part 12 supplies high-humidity air having a higher humidity than the air containing an object gas, and replaces the object gas adsorbed by the adsorbent with the steam in the high-humidity air having a humidity lower than the high-humidity air. The steam desorption part supplies low-humidity air having a humidity lower than the high-humidity air, and desorbs the steam adsorbed by the adsorbent. Each part on the adsorption rotor transfer the gas adsorption part, the gas replacement part, and the steam desorption part by repetition in this order by rotation of the adsorption rotor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas recovery and concentration apparatus and a gas recovery and concentration method, and more particularly, a gas recovery and concentration apparatus that recovers and concentrates gas from the air using a rotary adsorption member, and a gas recovery and concentration using the same. It is about the method.

  In recent years, thermal power plants and various combustion facilities have been required to separate, recover and dispose of substances such as carbon dioxide, sulfur oxides and nitrogen oxides contained in exhaust gas from the viewpoint of environmental protection. .

  For example, as a method for separating and recovering carbon dioxide, an absorption method using an alkali solution such as an amine, an adsorption method using an adsorbent such as zeolite or activated carbon, and the like are known. In addition, by separating and concentrating carbon dioxide from the air, household power generation, hot water combustor exhaust, etc., it is also useful for promoting the growth of crops in horticultural greenhouses such as greenhouses. It has been broken.

  Not only in large-scale power plants and factory combustion facilities, but also for use in household power generation, hot water combustors, and in horticultural greenhouses as described above, By using a temperature swing method (TSA method) using a rotary adsorption rotor as described, the gas recovery and concentration device can be simplified and downsized. In Patent Document 1, the adsorption rotor is provided with an adsorption zone, a preheating zone, a low-concentration gas purge zone, a desorption zone, a high-concentration gas purge zone, a precooling zone, and a cooling zone. Heating and cooling the adsorption rotor reduces the energy required for gas recovery and concentration.

JP2016-175014A

  However, since the method of Patent Document 1 uses the temperature difference to adsorb and desorb the gas, heated air for desorbing the gas from the adsorbent and regenerating the adsorbent is essential. Energy is used for cooling purposes. Even in Patent Document 1, there is still room for energy reduction.

  An object of the present invention is to provide a gas recovery and concentration apparatus that does not require heated air for desorption of the adsorbed gas, and a gas recovery and concentration method using the same.

  The gas recovery and concentration apparatus according to the present invention includes an adsorbent capable of reversibly adsorbing water vapor and a target gas composed of a gas other than water vapor, and having an adsorption capacity for water vapor that is greater than that for the target gas. An adsorption rotor, a gas adsorption unit that supplies gas-containing air containing the target gas to the adsorption rotor, and adsorbs the target gas to the adsorbent; and high-humidity air having a higher humidity than the gas-containing air And a gas replacement unit that replaces the target gas adsorbed by the adsorbent with water vapor in the high-humidity air, and each part on the adsorption rotor is rotated by the rotation of the adsorption rotor. The gist is to repeatedly move the gas adsorption unit and the gas replacement unit.

  Here, “high-humidity air” and “low-humidity air” refer to those that are “high-humidity” and “low-humidity” relative to others, and are not a concept indicating absolute humidity.

  The gas recovery and concentration apparatus further includes a water vapor desorption unit that supplies low humidity air having a lower humidity than the high humidity air to the adsorption rotor and desorbs the water vapor adsorbed on the adsorbent. Preferably, each part on the adsorption rotor repeatedly moves the gas adsorption unit, the gas replacement unit, and the water vapor desorption unit in this order by the rotation of the adsorption rotor.

  In the gas adsorption part, it is preferable that the gas generated when the gas-containing air passes through the adsorption rotor is supplied to the water vapor desorption part as the low-humidity air.

  The target gas to be recovered and concentrated by the gas recovery and concentration apparatus according to the present invention is preferably carbon dioxide.

  In the gas replacement unit, the gas generated when the high-humidity air passes through the adsorption rotor is preferably supplied to a horticultural greenhouse.

  A gas recovery and concentration method according to the present invention is a gas recovery and concentration method using the gas recovery and concentration apparatus described above, wherein gas-containing air containing the gas is supplied to the gas adsorption unit while rotating the adsorption rotor. A gas adsorption step for adsorbing the target gas to the adsorbent, and supplying the high-humidity air having a higher humidity than the gas-containing air to the gas replacement unit, and the target gas adsorbed on the adsorbent, And a gas replacement step of replacing with water vapor in the high-humidity air.

  In the gas recovery and concentration method according to the present invention, low-humidity air having a humidity lower than that of the high-humidity air is supplied to the water vapor desorption section, and the water vapor adsorbed on the adsorbent is desorbed into the low-humidity air. It is preferable to further comprise a water vapor desorption step.

  The adsorption rotor according to the present invention includes an adsorbent having an adsorption ability for water vapor that is larger than an adsorption ability for a target gas. As a result, when high humidity air with high humidity and a large amount of water vapor is supplied in the gas replacement unit, the target gas adsorbed by the adsorbent is replaced with water vapor (water) having a large adsorption capacity, and the adsorption rotor. Detach from. The gas recovery and concentration apparatus according to the present invention desorbs adsorbed gas without using heated air by using substitution of adsorbed molecules due to the difference in adsorption ability between water vapor and the target gas to be recovered and concentrated. It can be used and is excellent in energy saving.

  In the gas replacement unit, the water adsorbed by the adsorbent is evaporated (desorbed) by supplying low-humidity air, and the adsorption performance of the adsorption rotor is regenerated. The low-humidity air may be supplied as gas-containing air containing the target gas, for example, in the gas adsorption unit, or provided separately from the gas-containing air by providing a water vapor desorption unit separately from the gas adsorption unit. Also good. When a gas adsorption part and a water vapor desorption part are provided independently and low humidity air is supplied to the water vapor desorption part, water evaporation (desorption) and adsorption of the target gas proceed efficiently in each area. Thus, the efficiency of regeneration of the adsorbent by collecting and concentrating the target gas and desorbing water vapor is improved.

  When each part on the adsorption rotor is repeatedly moved in this order by the rotation of the adsorption rotor, the gas adsorption part, the gas replacement part, and the water vapor desorption part have, for example, a composition or temperature suitable for each part. Air can be supplied, and adsorption of the target gas, replacement of water vapor with the target gas, and desorption of water vapor are efficiently repeated in each part, and the recovery and concentration performance of the target gas is improved.

  As the low-humidity air supplied to the water vapor desorption section, air that has passed through the adsorption rotor in the gas adsorption section can be used. The air that has passed through the adsorption rotor in the gas adsorption unit is in a low humidity state where the target gas to be recovered and concentrated is removed. When this is supplied to the water vapor desorption unit, the target gas is adsorbed in the water vapor desorption unit. Therefore, the adsorption ability of the adsorbent to the target gas is sufficiently recovered, and the target gas can be efficiently adsorbed in the subsequent gas adsorption section.

  The adsorbent constituting the adsorption rotor is not particularly limited as long as it is capable of reversibly adsorbing water vapor and the target gas, and has an ability to adsorb water vapor larger than that for the target gas. What is necessary is just to select an appropriate thing according to object gas. Specifically, porous bodies, such as a zeolite, a silica gel, activated alumina, can be illustrated. For example, if the adsorption rotor 10 is made of zeolite, it is excellent in water resistance, heat resistance, and adsorbent selectivity, and the pore diameter and shape, silica / alumina depending on the conditions of use of the gas recovery concentrator. Desired adsorption characteristics can be imparted by appropriately adjusting the ratio and the like.

  The target gas to be recovered and concentrated by the gas recovery and concentration apparatus according to the present invention is not particularly limited as long as it is a gas other than water vapor. For example, carbon dioxide, biogas, methane, nitrogen oxide and the like can be exemplified. In particular, carbon dioxide is desired to be recovered from the exhaust of combustion facilities from the viewpoint of environmental protection. In the agricultural field, carbon dioxide should be supplied to a horticultural greenhouse from the viewpoint of promoting the growth of crops and improving quality. Is desired. For example, the gas recovery and concentration apparatus according to the present invention is connected to a greenhouse for horticulture such as a greenhouse, and the air passing through the adsorption rotor in the gas replacement unit is supplied to the horticultural greenhouse, so that the air or heating or power generation It is possible to collect and concentrate the carbon dioxide gas contained in the exhaust gas from the combustion facility, etc. to increase the carbon dioxide concentration in the horticultural greenhouse.

  According to the gas recovery and concentration method according to the present invention, the adsorbed target gas is desorbed without using heated air by utilizing the substitution of adsorbed molecules due to the difference in adsorption ability between the water vapor and the target gas to be recovered and concentrated. It can be used and is excellent in energy saving.

It is a figure showing the outline of the gas recovery concentration device concerning a 1st embodiment. It is a block diagram which shows the structure of the gas collection | recovery concentration apparatus concerning 1st Embodiment, and the flow of gas. It is a block diagram which shows the structure at the time of providing the cyclic | annular path | route in the gas collection concentration apparatus concerning 1st Embodiment, and a gas flow. It is a block diagram which shows the structure and gas flow of the gas collection concentration apparatus concerning 2nd Embodiment. It is a block diagram which shows the structure and gas flow of the gas collection concentration apparatus concerning 3rd Embodiment.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment, a carbon dioxide recovery and concentration apparatus that recovers and concentrates carbon dioxide as a target gas will be described as an example.

<First Embodiment>
FIG. 1 is a diagram showing an outline of a gas recovery and concentration apparatus according to the first embodiment. FIG. 2 is a block diagram showing the configuration and gas flow of the gas recovery and concentration apparatus according to the first embodiment.

  The gas recovery and concentration apparatus 1 according to the present embodiment includes an adsorption rotor 10 that is rotated by a motor 24 and a power belt 25, and a gas adsorption unit 11 that supplies gas-containing air containing carbon dioxide to the adsorption rotor 10; A gas replacement unit 12 that supplies high-humidity air having a higher humidity than the gas-containing air. The gas adsorption unit 11 and the gas replacement unit 12 in the figure are partitioned from each other, and each part of the adsorption rotor 10 is formed as a space in which the part can move. As the adsorption rotor 10 rotates, the gas adsorption unit 11 and the gas replacement unit 12 are alternately moved.

  The gas adsorption unit 11 is connected to a gas supply pipe 14 that supplies gas-containing air containing carbon dioxide and a residual air discharge pipe 15 that exhausts the air that has passed through the gas adsorption unit 11. It is connected to a water vapor supply pipe 16 for supplying air and a gas recovery pipe 17 for recovering air containing carbon dioxide desorbed from the adsorbent. The upstream side of the water vapor supply pipe 16 is connected to the house 21 via a valve 35 and is supplied with high-humidity air. On the other hand, the downstream side of the gas recovery pipe 17 is connected to the greenhouse 20 which is a horticultural greenhouse via a valve 34, and can supply concentrated carbon dioxide to the greenhouse 20.

  The adsorption rotor 10 can be configured using various adsorbents having the ability to adsorb water vapor and carbon dioxide. For example, a material containing an adsorbent may be formed into a rotor shape, or a rotor-like container may be filled with an adsorbent. In addition, air of different compositions flows into each part of the adsorption rotor 10 with time as it rotates. In order to prevent the inflowing air from diffusing and mixing inside the rotor, the adsorption rotor 10 is preferably provided with a radial inner wall centered on the rotation axis in the structure. By providing the inner wall, the air flowing from each area can be prevented from mixing, and the gas collection and concentration efficiency is improved. The adsorption performance of the adsorbent also depends on the temperature. For example, the gas adsorption unit 11 preferably has a low temperature, and the gas replacement unit 12 has a high temperature. From the viewpoint of temperature management between the areas, a member having heat insulation may be used on the inner wall.

  The adsorbent is not particularly limited as long as it can reversibly adsorb water vapor and carbon dioxide, and has an ability to adsorb water vapor larger than that for carbon dioxide. Specific examples include zeolite, silica gel, activated alumina, and the like. For example, if the adsorption rotor 10 is made of zeolite, it is excellent in water resistance, heat resistance, and adsorbent selectivity, and the pore diameter and shape, silica / alumina depending on the conditions of use of the gas recovery concentrator. Desired adsorption performance can be imparted by appropriately adjusting the ratio and the like. Further, the adsorbent preferably has a honeycomb structure. The honeycomb structure is a structure in which columnar adsorbents having through holes are arranged substantially in parallel. The adsorbent having a honeycomb structure may be one in which the adsorbent itself has a honeycomb structure, or may be an adsorbent disposed on the surface of a substrate having a honeycomb structure. When the adsorbent has a honeycomb structure, since the surface area is large and the pressure loss of the inflowing air is small, the target gas and water vapor can be adsorbed and desorbed efficiently.

  The gas supply pipe 14 connected to the gas adsorption unit 11 sucks air containing carbon dioxide, such as outside air or exhaust from a combustion facility, by the blower 31 and supplies gas-containing air to the gas adsorption unit 11. In the gas adsorption part 11, carbon dioxide is adsorbed by the adsorbent contained in the adsorption rotor 10, and air from which at least a part of carbon dioxide has been removed from the gas-containing air is discharged from the residual air discharge pipe 15.

  The carbon dioxide adsorbed by the adsorbent in the gas adsorption unit 11 is transferred to the gas replacement unit 12 as the adsorption rotor 10 rotates. In the gas replacement unit 12, high-humidity air containing a large amount of water vapor is supplied from the water vapor supply pipe 16, carbon dioxide and water vapor are substituted due to the difference in adsorption capacity between carbon dioxide and water vapor, and water vapor is adsorbed on the adsorbent. At the same time, carbon dioxide is desorbed from the adsorbent. The desorbed carbon dioxide is recovered by the gas recovery pipe 17 and supplied to the greenhouse 20. Further, for example, when the carbon dioxide concentration in the greenhouse 20 becomes too high, or when it is desired to increase the carbon dioxide concentration, as shown in FIG. By connecting the supply pipe 16 and narrowing the valve 34, a part of the gas passing through the gas replacement unit 12 and recovered in the gas recovery pipe 17 is converted into an annular shape including the water vapor supply pipe 16 and the gas recovery pipe 17. You may circulate in a path | route, and after mixing with the air containing many water vapor | steams supplied from the house 21, you may supply to the gas replacement part 12 again.

  The high-humidity air supplied from the water vapor supply pipe 16 only needs to have a higher humidity than the gas-containing air supplied to the gas adsorption unit 11. For example, indoor air of a facility with relatively high humidity such as a house 21 or a greenhouse for gardening can be used. Further, from the viewpoint of promoting the desorption of carbon dioxide in the gas replacement unit 12, the high humidity air preferably has a lower carbon dioxide concentration than the gas-containing air. When exhaust gas such as a combustor is used for gas-containing air, indoor air such as a house 21 or a horticultural greenhouse has a lower carbon dioxide concentration and can efficiently desorb carbon dioxide. Using high-humidity air in such facilities effectively desorbs carbon dioxide without the need for special means such as reducing the concentration of carbon dioxide in high-humidity air or increasing the humidity. It is excellent in energy saving.

  The water vapor adsorbed by the adsorbent in the gas substitution unit 12 is transferred to the gas adsorption unit 11 as the adsorption rotor 10 rotates. In the present embodiment, in the gas adsorption unit 11, the adsorption of carbon dioxide and the desorption of water vapor by the gas-containing air occur in parallel. That is, the water adsorbed by the adsorbent is desorbed (evaporated) into the gas-containing air with relatively low humidity, so that the adsorption performance of the adsorbent is restored and carbon dioxide is adsorbed at the vacant adsorption site. .

  The carbon dioxide recovered and concentrated by the gas recovery and concentration apparatus 1 is supplied to the greenhouse 20 and can promote the photosynthesis of the crop. The greenhouse 20 is often used mainly in the winter when the temperature is low and crops are difficult to grow. In general, the lower the temperature of the adsorbent, the larger the amount of adsorption of the target substance. Therefore, when the gas recovery and concentration apparatus 1 according to the present embodiment is used in winter, part of the gas adsorption unit 11 and the gas supply pipe 14 is used. Alternatively, by cooling the whole with outside air, the adsorption rotor 10 can be cooled, and the adsorption efficiency of carbon dioxide in the gas adsorption unit 11 is improved. Further, since the humidity in the atmosphere decreases during the winter season, the outside air can be directly taken in and supplied to the gas adsorption unit 11. At this time, for example, by increasing the output of the blower 31 and increasing the flow rate of the gas supplied to the gas adsorption unit 11, a large amount of carbon dioxide can be adsorbed on the adsorbent contained in the adsorption rotor 10. In particular, the carbon dioxide concentration in the greenhouse 20 can be increased.

  The power sources such as the motor 24 and the blowers 31 and 32 used for rotating the adsorption rotor 10 are not particularly limited, and for example, electric power generated by solar power can be used. Since the solar power generation system is excellent in energy saving and generates power during sunshine, the affinity of the gas recovery and concentration apparatus 1 according to the present invention and the solar power generation system is high when the purpose is to promote photosynthesis of plants.

<Second Embodiment>
A second embodiment will be described. FIG. 4 is a block diagram showing the configuration and gas flow of the gas recovery and concentration apparatus according to the second embodiment. In the following description, part of the detailed description of the configuration having the same or similar functions as those of the previous embodiment is omitted. The present embodiment is different from the first embodiment in that it has a water vapor desorption section 13, a low humidity air supply pipe 18 and a water vapor discharge pipe 19 connected thereto.

  The gas recovery and concentration apparatus 1 according to this embodiment includes an adsorption rotor 10 that is rotated by a motor 24 and a power belt 25, and a gas adsorption unit 11 that supplies gas-containing air containing a target gas to the adsorption rotor 10; The gas replacement unit 12 supplies high-humidity air having a higher humidity than the gas-containing air, and the water vapor desorption unit 13 supplies low-humidity air having a lower humidity than the high-humidity air. The gas adsorption unit 11, the gas replacement unit 12, and the water vapor desorption unit 13 in the drawing are partitioned from each other and are formed as spaces in which the respective parts of the adsorption rotor 10 can move. Each upper part moves the gas adsorption part 11, the gas replacement part 12, and the water vapor desorption part 13 in this order with the rotation of the adsorption rotor 10.

  The gas adsorbing unit 11 is connected to a gas supply pipe 14 that supplies gas-containing air containing carbon dioxide and a residual air discharge pipe 15 that discharges air after adsorption, and the gas replacement unit 12 supplies high-humidity air. The water vapor supply pipe 16 is connected to a gas recovery pipe 17 that collects the gas containing the desorbed carbon dioxide. The water vapor desorption section 13 includes a low humidity air supply pipe 18 that supplies low humidity air, and a desorbed water vapor. Is connected to a water vapor exhaust pipe 19 that exhausts a gas containing gas. The water vapor supply pipe 16 and the gas recovery pipe 17 are both connected to a greenhouse 20 that is a horticultural greenhouse and forms an annular path.

  The inside of the greenhouse 20 has sufficient moisture for the growth of the crop, is kept at a relatively high temperature, and further has high humidity due to the effect of transpiration from the crop. Therefore, the greenhouse 20 not only consumes the collected and concentrated carbon dioxide but also has a function of supplying high-humidity air to the water vapor supply pipe 16. Both the water vapor supply pipe 16 and the gas recovery pipe 17 are connected to the greenhouse 20, and air is circulated in an annular path, so that carbon dioxide is recovered from outside air or the like with a simple configuration, and photosynthesis of crops is performed. Can be promoted.

  The water vapor adsorbed by the adsorbent in the gas replacement unit 12 is transferred to the water vapor desorption unit 13 as the adsorption rotor rotates. The water vapor desorption unit 13 is connected to a low-humidity air supply pipe 18 that supplies low-humidity air having a humidity lower than that of high-humidity air. When the low-humidity air is supplied to the water vapor desorption section 13, the water adsorbed by the adsorbent is desorbed into the low-humidity air having a relatively low humidity and is discharged from the water vapor discharge pipe 19. Thereby, the adsorption | suction performance with respect to the carbon dioxide of the adsorption | suction rotor 10 recovers, and it transfers to the gas adsorption part 11 which continues.

  In the present embodiment, the gas adsorption unit 11 and the water vapor desorption unit 13 are provided separately, and the points on the adsorption rotor 10 correspond to the gas adsorption unit 11, the gas replacement unit 12, and the water vapor desorption as the adsorption rotor 10 rotates. By adopting a configuration in which the unit 13 moves in order, carbon dioxide can be adsorbed to the adsorbent in the gas adsorption unit after the water vapor desorption unit 13 sufficiently desorbs the water vapor.

  The low-humidity air supplied to the water vapor desorption unit 13 is not particularly limited as long as it has a lower humidity than the high-humidity air supplied to the gas replacement unit 12, and the gas-containing air supplied to the gas adsorption unit 11 May be the same or different. From the viewpoint of water desorption efficiency at the water vapor desorption section 13 and gas adsorption efficiency at the subsequent gas adsorption section 11, low-humidity air has a low content of water vapor, carbon dioxide, and other substances having adsorptivity. It is preferable. From this point of view, a removal device for removing water vapor or other adsorbent substances may be provided upstream of the low-humidity air supply pipe 18. In the winter season, dry air with relatively few adsorptive impurities can be obtained from the outside air. Therefore, the outside air may be directly taken into low-humidity air. Further, as in a third embodiment to be described later, the residual air discharge pipe 15 and the low-humidity air supply pipe are communicated, and the air that has passed through the adsorption rotor 10 in the gas adsorption unit 11 is supplied to the water vapor desorption unit 13. May be.

  The low-humidity air supplied to the water vapor desorption unit 13 is preferably at a certain high temperature from the viewpoint of water vapor desorption efficiency in the water vapor desorption unit 13. On the other hand, since the adsorption amount of the target substance increases as the temperature of the adsorbent becomes lower, it is not preferable that the adsorption rotor 10 becomes too high in the gas adsorption unit 11. From such a viewpoint, the low-humidity air supplied to the water vapor desorption unit 13 is higher in temperature than the gas-containing air supplied to the gas adsorption unit 11 and lower in temperature than the high-humidity air supplied to the gas replacement unit 12. It is preferable that When the low-humidity air is within the above range, the adsorption rotor 10 is cooled in the water vapor desorption section 13 and the water vapor is sufficiently desorbed, and the carbon dioxide adsorption performance in the gas adsorption section 11 is improved.

<Third Embodiment>
A third embodiment will be described. FIG. 5 is a block diagram showing the configuration and gas flow of the gas recovery and concentration apparatus according to the third embodiment. In the following description, part of the detailed description of the configuration having the same or similar functions as those of the previous embodiment is omitted. This embodiment has a dehydrator 26 on the upstream side of the gas supply pipe 14, a point having a gas recovery container 23 instead of the greenhouse 20, and a water vapor generator 22 instead of the house 21 or the greenhouse 20. The residual air discharge pipe 15 and the low-humidity air supply pipe 18 are continuously provided, which is different from the first and second embodiments.

  The gas recovery and concentration apparatus 1 according to this embodiment includes an adsorption rotor 10 that is rotated by a motor 24 and a power belt 25, and a gas adsorption unit 11 that supplies gas-containing air containing a target gas to the adsorption rotor 10; The gas replacement unit 12 supplies high-humidity air having a higher humidity than the gas-containing air, and the water vapor desorption unit 13 supplies low-humidity air having a lower humidity than the high-humidity air. The gas adsorption unit 11, the gas replacement unit 12, and the water vapor desorption unit 13 in the drawing are partitioned from each other and are formed as spaces in which the respective parts of the adsorption rotor 10 can move. Each upper part moves the gas adsorption part 11, the gas replacement part 12, and the water vapor desorption part 13 in this order with the rotation of the adsorption rotor 10.

  The gas adsorbing unit 11 is connected to a gas supply pipe 14 that supplies gas-containing air containing carbon dioxide and a residual air discharge pipe 15 that discharges air after adsorption, and the gas replacement unit 12 supplies high-humidity air. The water vapor supply pipe 16 is connected to a gas recovery pipe 17 that recovers the desorbed carbon dioxide, and the water vapor desorption section 13 discharges the low humidity air supply pipe 18 that supplies low humidity air and the desorbed water vapor. Connected to the water vapor discharge pipe 19. The water vapor supply pipe 16 and the gas recovery pipe 17 form an annularly connected path. A steam generator 22 is connected to the upstream side of the steam supply pipe 16, and steam is supplied to the steam supply pipe 16. In addition, a part of the downstream side of the gas recovery pipe 17 is branched and connected to the gas recovery container 23 via the valve 36. The concentrated carbon dioxide can be stored in the gas recovery container 23 by opening the valve 34. The carbon dioxide stored in the gas recovery container 23 can be used for industrial use or can be discarded after detoxification.

  A dehydrator 26 is provided on the upstream side of the gas supply pipe 14, and moisture contained in the air containing the gas sucked by the blower 31 is removed. The dehydrator 26 is not particularly limited as long as it can remove moisture in the air. Examples thereof include a method of filtering using a hygroscopic adsorbent, a method of using a gas separation membrane, a method of cooling or compressing air and extracting condensed water, and a method of centrifugation. By providing the dehydrator 26, water vapor having a larger adsorption capacity than that of the target gas is removed, and even in the case where a large amount of water vapor is contained in summer outdoor air, combustion exhaust gas, or the like, the gas adsorption unit 11 can efficiently emit carbon dioxide. Carbon can be adsorbed. From such a point of view, in addition to the dehydrating device 26, a device that previously removes substances that may hinder the adsorption of the target gas, harmful substances, and the like may be provided. On the other hand, if the gas-containing air does not contain or can be ignored in the presence of water vapor and other substances that can interfere with the target gas, it is not necessary to provide the dehydrator 26 and other removal devices.

  A steam generator 22 is provided on the upstream side of the steam supply pipe 16, and the steam is sent into the steam supply pipe 16. Thereby, the air supplied to the gas replacement part 12 is maintained at high humidity. The water vapor generating device 22 may be installed in an annular path, or may be installed outside the annular path as in the house 21 in FIG. The steam generator 22 is not particularly limited as long as it can supply steam, and a steam generator that generates steam by a conventionally known method can be used. For example, a heating type, an ultrasonic type, a vaporizing type, or a combination thereof can be exemplified. If high-humidity air sufficiently containing water vapor can be supplied, the air may be supplied from outside air or a facility such as a greenhouse for gardening without providing the water vapor generator 22.

  In the present embodiment, a residual air discharge pipe 15 connected to the gas adsorption unit 11 and a low-humidity air supply pipe 18 connected to the water vapor desorption unit 13 are continuously provided, and the gas adsorption unit 11 is exhausted. Supply to the water vapor desorption section 13. Carbon dioxide and water vapor are removed from the air discharged from the residual air discharge pipe 15, and when such air is supplied to the water vapor desorption section 13, carbon dioxide adsorption occurs in the water vapor desorption section 13. It is difficult, and the desorption of water vapor can be performed smoothly, and the gas adsorption in the gas adsorption unit 11 also proceeds smoothly.

  The gas recovery and concentration apparatus 1 according to this embodiment can control the composition of the air supplied to the adsorption rotor 10 and can highly concentrate the target gas. On the other hand, in the first and second embodiments described above, energy efficiency is excellent by effectively utilizing outside air, indoor air of the greenhouse 20 or the house 21, and the like. The gas recovery and concentration apparatus 1 can be constructed by combining the configurations of the embodiments according to the required energy saving property, the use environment, the degree of concentration of the target gas, and the like.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, the target gas other than carbon dioxide can be recovered and concentrated by appropriately selecting the adsorbent and gas-containing air contained in the adsorption rotor 10. The recovered and concentrated gas can be used for industrial use, or can be discarded after detoxification.

DESCRIPTION OF SYMBOLS 1 Gas collection | recovery concentration apparatus 10 Adsorption rotor 11 Gas adsorption part 12 Gas substitution part 13 Water vapor | steam desorption part 14 Gas supply pipe 15 Residual air discharge pipe 16 Water vapor supply pipe 17 Gas recovery pipe 18 Low-humidity air supply pipe 19 House 21 House 22 Steam generator 23 Gas recovery container 24 Motor 25 Power belt 26 Dehydrator 31 Blower 32 Blower 33 Blower 34 Valve 35 Valve

Claims (7)

It is possible to reversibly adsorb water vapor and a target gas composed of a gas other than water vapor, and includes an adsorption rotor including an adsorbent having an adsorption capacity for water vapor larger than that for the target gas,
For the adsorption rotor,
A gas adsorbing unit that supplies gas-containing air containing the target gas and adsorbs the target gas to the adsorbent;
A high-humidity air having a higher humidity than the gas-containing air, and a gas replacement unit that replaces the target gas adsorbed by an adsorbent with water vapor in the high-humidity air,
Each part on the adsorption rotor repeatedly moves the gas adsorption unit and the gas replacement unit by the rotation of the adsorption rotor. The gas recovery and concentrating device is connected to the adsorption rotor.
Supplying low-humidity air whose humidity is lower than that of the high-humidity air, further comprising a water vapor desorption part for desorbing the water vapor adsorbed on the adsorbent,
2. The respective portions on the adsorption rotor repeatedly move the gas adsorption unit, the gas replacement unit, and the water vapor desorption unit in this order by the rotation of the adsorption rotor. A gas recovery and concentration apparatus as described in 1.   3. The gas according to claim 2, wherein in the gas adsorption unit, a gas generated when the gas-containing air passes through the adsorption rotor is supplied to the water vapor desorption unit as the low-humidity air. Recovery concentrator.   The gas recovery and concentration apparatus according to any one of claims 1 to 3, wherein the target gas is carbon dioxide.   The gas recovery and concentration apparatus according to claim 4, wherein in the gas replacement unit, the gas generated when the high-humidity air passes through the adsorption rotor is supplied to a greenhouse for horticulture. A gas recovery and concentration method using the gas recovery and concentration apparatus according to any one of claims 1 to 5, wherein the adsorption rotor is rotated,
A gas adsorption step of supplying gas-containing air containing the target gas to the gas adsorption unit, and adsorbing the target gas to the adsorbent;
A gas replacement step of supplying high-humidity air having a higher humidity than the gas-containing air to the gas replacement unit, and replacing the target gas adsorbed by the adsorbent with water vapor in the high-humidity air;
A gas recovery and concentration method comprising:   A water vapor desorption step of supplying low-humidity air having a humidity lower than that of the high-humidity air to the water vapor desorption unit, and desorbing the water vapor adsorbed on the adsorbent into the low-humidity air. The gas recovery and concentration method according to claim 6, wherein:

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