JP4950121B2 - Air cleaning apparatus and air cleaning method - Google Patents

Description

  The present invention relates to an air cleaning device, and more particularly to an air cleaning device that removes carbon dioxide from the air.

  Carbon dioxide removal devices used in space stations are known.

  FIG. 1 is disclosed by James C. Knox in the “International Space Station Carbon Dioxide Assembly Testing” (American Aeronautics and Space Administration Technical Report, 2000). 1 shows a carbon dioxide removal device. The carbon dioxide removal device includes dehumidifying agent beds 201 and 202 and carbon dioxide absorbent beds 211 and 212.

  In order to maintain the carbon dioxide adsorption performance of the carbon dioxide absorbent beds 211 and 212, it is necessary to remove moisture from the air in advance by the dehumidifying agent beds 201 and 202. Moreover, it is necessary to return the moisture removed from the air to the manned closed space.

  The air purifier continuously removes carbon dioxide by repeating the following operation.

  First, air is returned through the dehumidifying agent bed 201, the carbon dioxide absorbent bed 212, and the dehumidifying agent bed 202 in order. The dehumidifying agent bed 201 adsorbs moisture in the air. The carbon dioxide absorbent bed 212 adsorbs carbon dioxide in the air from the dehumidifier bed 201. The dehumidifying agent bed 202 desorbs the adsorbed moisture to the air from the carbon dioxide absorbent bed 212. At this time, the carbon dioxide absorbent bed 211 desorbs the adsorbed carbon dioxide, and this carbon dioxide is exhausted to the space vacuum.

  Next, the air is returned through the dehumidifying agent bed 202, the carbon dioxide absorbent bed 211, and the dehumidifying agent bed 201 in order. The dehumidifying agent bed 202 adsorbs moisture in the air. The carbon dioxide absorbent bed 211 adsorbs carbon dioxide in the air from the dehumidifier bed 202. The dehumidifying agent bed 201 desorbs the adsorbed moisture to the air from the carbon dioxide absorbent bed 211. The carbon dioxide absorbent bed 212 desorbs the adsorbed carbon dioxide, and this carbon dioxide is exhausted to the space vacuum.

James C. Knox, "International Space Station CO2 Removal System Test", US Aerospace Agency Technical Report, 2000

  An object of the present invention is to make the air cleaning device compact.

  Hereinafter, means for solving the problem will be described using the numbers used in (Best Mode for Carrying Out the Invention). These numbers are added to clarify the correspondence between the description of (Claims) and (Best Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  The air purifier according to the present invention includes three or more dehumidifying towers (20A to 20F), a plurality of decarburizing towers (30X, 30Y) including a decarburizing agent that adsorbs and desorbs carbon dioxide, and a plurality of dehumidifying towers. And a flow generator (40) for generating the first flow state and the second flow state so that the time of the first flow state is shorter than the time of the second flow state. In the state of the first flow, after the air that has left the purification target space (100) passes through the dehumidification tower, it passes through one of the multiple decarburization towers and returns to the purification target space. In the state of the second flow, after the air that has left the purification target space passes through the dehumidification tower, it returns to the purification target space without passing through any of the multiple decarburization towers. In the state of the first flow, the dehumidifying agent provided in the dehumidifying tower adsorbs moisture. In the second flow state, the hygroscopic agent desorbs moisture.

  The plurality of decarburization towers preferably include a first decarburization tower (30X) and a second decarburization tower (30Y) connected to the first decarburization tower via a heat pipe (34).

  It is preferable that the air cleaning device further includes an artificial muscle pump that circulates the heat medium enclosed in the heat pipe.

  The flow generator includes flow paths (41 to 44, 46X, 46Y, 47X, 47Y) through which air flows in the first flow state or the second flow state. The channel is preferably formed in the integrated piping structure (70). The integrated piping structure includes a first plate (71) in which grooves (75, 76) corresponding to the flow paths are formed, and a second plate (72) joined to the first plate so as to cover the grooves. .

  The multiple dehumidification tower or the multiple decarburization tower is preferably formed in an integrated piping structure. The dehumidifying agent or decarburizing agent is accommodated in a space sandwiched between the first plate and the second plate.

  The space is preferably formed in a rectangular parallelepiped shape.

  The plurality of decarburization towers are connected to the space vacuum via the first exhaust valve (63X) and the first decarburization tower (30X) connected to the space vacuum via the first exhaust valve (63X). It is preferable that a decarburization tower (30Y) is included. The first decarburization tower and the second decarburization tower are preferably connected via pressure equalizing valves (53, 54).

  The flow generator preferably includes a keeping pump (56) that moves air from one of the first decarburization tower and the second decarburization tower to the other.

  Each of the plurality of decarburization towers is preferably connected to a space vacuum via exhaust valves (63X, 63Y). The flow generator includes a carbon dioxide-removed air return line (43) to which a plurality of decarburization towers and a plurality of dehumidification towers are connected, and a keeping pump that moves air from each of the plurality of decarburization towers to a carbon dioxide-removed air return line. (56).

  The flow generator includes a first valve plate (25) having a dehumidified air port (25a) and a carbon dioxide-removed air port (25b), a processing air port (26a), and a moisture recovered air port (26b). A second valve plate (26), a processing air supply line (41) through which air flows from the processing target space to the processing air port, and a dehumidified air supply line (42) through which air flows from the dehumidified air port to the plurality of decarburization towers. ), A carbon dioxide-removed air return line (43) through which air flows from a plurality of decarburization towers to a carbon dioxide-removed air port, and a moisture-recovered air return through which air flows from the moisture-recovered air port to the processing target space It is preferable to provide a line (44). The plurality of dehumidifying towers are preferably arranged on the circumference to form a dehumidifying tower aggregate (24). The processing air port and the dehumidified air port are connected via one or more M dehumidifying towers (20A) of the plurality of dehumidifying towers. The carbon dioxide-removed air port and the moisture-recovered air port are connected via other N dehumidifying towers (20C to 20E) more than M among the plurality of dehumidifying towers. The dehumidifying tower assembly is rotated relative to the valve plate pair formed by the first valve plate and the second valve plate, so that the dehumidifying towers constituting the M dehumidifying towers are replaced, and the N dehumidifying towers are replaced. The dehumidification tower that constitutes is replaced.

  In the air cleaning method according to the present invention, for each of the three or more multiple dehumidification towers (20A to 20F), the multiple decarburization towers (30X, 30Y) after the air exiting the purification target space (100) passes through the dehumidification tower. A step of generating a first flow state that passes through any one of the above and returning to the purification target space, and for the dehumidification tower, after the air exiting the purification target space passes through the dehumidification tower, the multiple decarburization towers are allowed to pass. And generating a second flow state that returns to the purification target space so as to be longer than the first flow state. Each of the multiple decarburization towers includes a decarburizing agent that adsorbs and desorbs carbon dioxide. In the step of generating the first flow state, the dehumidifying agent provided in the dehumidifying tower adsorbs moisture. In the step of generating the second flow condition, the hygroscopic agent desorbs moisture.

  In the air cleaning method according to the present invention, one of the first decarburization tower (30X) and the second decarburization tower (30Y) included in the decarburization unit (30) adsorbs carbon dioxide and the other desorbs carbon dioxide. The step of exchanging the roles of one and the other decarburization tower, and the treatment through one or more M dehumidification towers among three or more dehumidification towers (20A to 20F) provided in the dehumidification section (20) The air supply line (41) and the dehumidified air supply line (42) are connected to each other, and the carbon return-removed air return line (43) via the other N dehumidifying towers more than M among the plurality of dehumidifying towers. ) And a moisture recovery air return line (44), a step of replacing the dehumidifying towers constituting the M dehumidifying towers, and a step of replacing the dehumidifying towers constituting the N dehumidifying towers. . Each of the plurality of dehumidifying towers includes a dehumidifying agent that adsorbs and desorbs moisture. In the step in which one decarburization tower adsorbs carbon dioxide and the other decarburization tower desorbs carbon dioxide, air from the processing target space (100) flows to the dehumidifying section through the processing air supply line, and in the dehumidifying section Dehumidified air flows to one decarburization tower through a dehumidified air supply line, and air from which carbon dioxide has been removed in one decarburization tower flows to a dehumidification section through a carbon dioxide-removed air return line, The air whose moisture has been returned in the dehumidifying section returns to the treatment target space through the moisture recovery air return line, and the carbon dioxide desorbed in the other decarburization tower is exhausted to the external space.

  When the external space is a space vacuum, it is preferable that the air cleaning method further includes a step of equalizing the pressures of one decarburization tower and the other decarburization tower.

  The air cleaning method preferably further comprises the step of moving air from one decarburization tower to the other decarburization tower using a pump (56).

  Each of the first decarburization tower and the second decarburization tower is preferably connected to a carbon dioxide-removed air return line via an on-off valve (62X, 62Y). The air cleaning method preferably further comprises the step of moving air from one decarburization tower to the carbon dioxide-removed air return line using a pump (56).

  The plurality of dehumidifying towers are preferably arranged on the circumference to form a dehumidifying tower aggregate (24). The valve plate pair includes a first valve plate (25) having a dehumidified air port (25a) and a carbon dioxide-removed air port (25b), a processing air port (26a), and a moisture recovered air port (26b). A second valve plate (26). The dehumidified air port is connected to the dehumidified air supply line. The carbon dioxide removed air port is connected to the carbon dioxide removed air return line. The processing air port is connected to the processing air supply line. The moisture recovered air port is connected to the moisture recovered air return line. The processing air port and the dehumidified air port are connected through M dehumidifying towers. A carbon dioxide-removed air port and a moisture-recovered air port are connected via N dehumidifying towers. In the replacing step, it is preferable to rotate the dehumidifying tower assembly relative to the valve plate pair.

  According to the present invention, the air purifier is made compact.

  The best mode for carrying out an air cleaning device and an air cleaning method according to the present invention will be described below with reference to the accompanying drawings.

  The space 100 to be purified shown in FIG. 2 is a closed space such as a spacecraft, a space station, a space base, or a space in a space suit. Carbon dioxide is generated by the respiration of a person in the purification target space 100. In order to prevent the carbon dioxide concentration in the purification target space 100 from exceeding a predetermined concentration, carbon dioxide is removed from the air in the purification target space 100 using an air cleaning device.

  A decarburizing agent that adsorbs and desorbs carbon dioxide is used to remove carbon dioxide. In order to prevent the carbon dioxide adsorption performance of the decarburizer from being lowered, it is necessary to remove moisture from the air supplied to the decarburizer. In order to remove moisture, a dehumidifying agent that adsorbs and desorbs moisture is used. By speeding up the adsorption and desorption cycle of the decarburizing agent or dehumidifying agent, the total amount of the decarburizing agent or dehumidifying agent can be reduced. If the total amount of decarburizing agent or dehumidifying agent is reduced, the air cleaning device is made compact.

(First embodiment)
As shown in FIG. 2, the air cleaning device according to the first embodiment includes a harmful gas remover 10, a dehumidifying unit 20, a decarburizing unit 30, and a flow generator 40. The harmful gas remover 10 removes gases such as methane and ammonia. The dehumidifying unit 20 includes dehumidifying towers 20A to 20F. Each of the dehumidifying towers 20A to 20F includes vents 21 and 22 and a dehumidifying agent that adsorbs and desorbs moisture. The decarburization unit 30 includes decarburization towers 30X and 30Y. Each of the decarburization towers 30X and 30Y includes vents 31 and 32 and a decarburizing agent that adsorbs and desorbs carbon dioxide. The flow generator 40 connects the dehumidifying unit 20 and the decarburizing unit 30 with the pump 50, the processing air supply line 41 that connects the dehumidifying unit 20 to the purification target space 100 via the pump 50 and the harmful gas remover 10. The dehumidified air supply line 42 to be connected, the carbon dioxide-removed air return line 43 that connects the dehumidifying unit 20 and the decarburizing unit 30, and the moisture-recovered air return line that connects the dehumidifying unit 20 and the purification target space 100. 44 and an exhaust line 45 that connects the decarburizing unit 30 to a space vacuum as an external space.

  It is preferable to arrange a perforated plate in each of the vent holes 21, 22, 31, 32. Thereby, it is prevented that a dehumidifying agent and a decarburizing agent disperse | distribute, and an inflow gas flow is equalized.

  The vent 21 of the dehumidifying tower 20A is connected to the dehumidified air supply line 42 via the valve 82A, and is connected to the carbon dioxide removed air return line 43 via the valve 83A. The vent 21 of the dehumidifying tower 20B is connected to the dehumidified air supply line 42 via the valve 82B, and connected to the carbon dioxide-removed air return line 43 via the valve 83B. The vent 21 of the dehumidifying tower 20C is connected to the dehumidified air supply line 42 via the valve 82C, and is connected to the carbon dioxide removed air return line 43 via the valve 83C. The vent 21 of the dehumidifying tower 20D is connected to the dehumidified air supply line 42 via the valve 82D, and is connected to the carbon dioxide-removed air return line 43 via the valve 83D. The vent 21 of the dehumidifying tower 20E is connected to the dehumidified air supply line 42 via the valve 82E, and connected to the carbon dioxide removed air return line 43 via the valve 83E. The vent 21 of the dehumidifying tower 20F is connected to the dehumidified air supply line 42 via the valve 82F, and is connected to the carbon dioxide removed air return line 43 via the valve 83FA.

  The vent 22 of the dehumidifying tower 20A is connected to the processing air supply line 41 via a valve 81A, and is connected to the moisture recovered air return line 44 via a valve 84A. The vent 22 of the dehumidifying tower 20B is connected to the processing air supply line 41 via a valve 81B and is connected to the moisture recovered air return line 44 via a valve 84B. The vent 22 of the dehumidifying tower 20C is connected to the processing air supply line 41 via a valve 81C, and is connected to the moisture recovered air return line 44 via a valve 84C. The vent 22 of the dehumidifying tower 20D is connected to the processing air supply line 41 via a valve 81D, and is connected to the moisture recovered air return line 44 via a valve 84D. The vent 22 of the dehumidifying tower 20E is connected to the processing air supply line 41 via a valve 81E, and is connected to the moisture recovered air return line 44 via a valve 84E. The vent 22 of the dehumidifying tower 20F is connected to the processing air supply line 41 via a valve 81F, and connected to the moisture recovered air return line 44 via a valve 84F.

  The vent 31 of the decarburization tower 30X is connected to the carbon return-removed air return line 43 through a connection line 47X provided with an outlet 62X. The vent 31 of the decarburization tower 30Y is connected to the carbon return-removed air return line 43 via a connection line 47Y provided with an outlet 62Y. The vent 32 of the decarburization tower 30X is connected to the dehumidified air supply line 42 via a connection line 46X provided with an inlet valve 61X, and to the exhaust line 45 via a connection line 48X provided with an exhaust valve 63X. Connected. The vent 32 of the decarburization tower 30Y is connected to the dehumidified air supply line 42 via a connection line 46Y provided with an inlet valve 61Y, and connected to the exhaust line 45 via a connection line 48Y provided with an exhaust valve 63Y. Connected.

  The decarburization tower 30 </ b> X and the decarburization tower 30 </ b> Y are connected via a heat pipe 34. The flow generator 40 includes a keeping line 55. The keeping line 55 connects a first line 55a connecting the decarburization towers 30X and 30Y, a keeping pump 56 provided in the first line 55a, and a keep pump 56 and a carbon dioxide removed air return line 43. 2 lines 55b. In the first line 55a, a keeping valve 57 is provided between the decarburizing tower 30X and the keeping pump 56, and a keeping valve 58 is provided between the decarburizing tower 30Y and the keeping pump 56.

  Hereinafter, the operation of the air cleaning device according to the present embodiment will be described. In the air cleaning apparatus according to the present embodiment, carbon dioxide contained in the air from the purification target space 100 is adsorbed by the decarburization tower 30X, and the carbon dioxide adsorbed by the decarburization tower 30Y is exhausted to a space vacuum. Next, carbon dioxide contained in the air from the purification target space 100 is adsorbed by the decarburization tower 30Y, and the carbon dioxide adsorbed by the decarburization tower 30X is exhausted to a space vacuum. The above operation is repeated to remove carbon dioxide from the air in the purification target space 100.

  Here, in order to maintain the carbon dioxide adsorption performance in the decarburization towers 30 </ b> X and 30 </ b> Y, the air from the purification target space 100 is supplied to the decarburization unit 30 after moisture is removed in the dehumidification unit 20. The air supplied to the decarburizing unit 30 is returned to the purification target space 100 via the dehumidifying unit 20 after the carbon dioxide is removed there. The air returned to the purification target space 100 collects moisture in the dehumidifying unit 20.

  The fact that desorption takes more time than adsorption is an obstacle to speeding up the adsorption and desorption cycle. That is, simply increasing the speed causes a problem that the next adsorption is performed without sufficient desorption. In particular, it is important to perform the desorption of moisture well.

  Hereinafter, the operation of the air purifier for solving this problem will be described.

  First, a case where the keeping line 55 is not used will be described. In this case, the keeping valves 57 and 58 remain closed and do not open.

  The pump 50 supplies air from the purification target space 100 to the processing air supply line 41 via the harmful gas remover 10.

  First, the inlet valve 61X and the outlet valve 62X are open, the exhaust valve 63X is closed, the inlet valve 61Y and the outlet valve 62Y are closed, the exhaust valve 63Y is open, the valves 81A and 82A are open, and the valves 81B to 81F And 82B to 82F are closed, the valves 83A and 84A are closed, and the valves 83B to 83F and 84B to 84F are open. At this time, the air that has exited the purification target space 100 passes through the processing air supply line 41, the dehumidification tower 20A, the dehumidified air supply line 42, the decarburization tower 30X, and the carbon dioxide-removed air return line 43 in order. Passes, branches, passes through the dehumidification towers 20B to 20F, joins, passes through the moisture recovery air return line 44, and returns to the purification target space 100. The dehumidifying tower 20A adsorbs moisture in the air. The decarburization tower 30X adsorbs carbon dioxide in the air. The dehumidifying towers 20B to 20F desorb the adsorbed moisture to the air. The carbon dioxide desorbed from the decarburization tower 30Y is exhausted to the space vacuum through the exhaust line 45.

  Next, the valve 81A and the valve 82A are closed from the open state, the valve 83A and the valve 84A are opened from the closed state, the valve 81B and the valve 82B are opened from the closed state, and the valve 83B and the valve 84B are closed from the open state. Changed to As a result, the air that has left the purification target space 100 passes through the processing air supply line 41, the dehumidification tower 20B, the dehumidified air supply line 42, the decarburization tower 30X, and the carbon dioxide-removed air return line 43 in order. Passes, branches, passes through the dehumidification towers 20A, 20C to 20F, joins, passes through the moisture return air return line 44, and returns to the purification target space 100. Therefore, the roles of the dehumidification towers 20A and 20B are changed so that the dehumidification tower 20B adsorbs moisture in the air so that the moisture adsorbed by the dehumidification tower 20A is desorbed to the air.

  Next, the valve 81B and the valve 82B are closed from the open state, the valve 83B and the valve 84B are opened from the closed state, the valve 81C and the valve 82C are opened from the closed state, and the valve 83C and the valve 84C are closed from the open state. Changed to As a result, the air exiting the purification target space 100 passes through the processing air supply line 41, the dehumidification tower 20C, the dehumidified air supply line 42, the decarburization tower 30X, and the carbon dioxide-removed air return line 43 in order. Passes, branches, passes through the dehumidification towers 20A, 20B, 20D-20F, joins, passes through the moisture return air return line 44, and returns to the purification target space 100. Therefore, the roles of the dehumidifying towers 20B and 20C are changed so that the dehumidifying tower 20C absorbs moisture in the air so that the moisture adsorbed by the dehumidifying tower 20B is desorbed to the air.

  Next, the valve 81C and the valve 82C are opened from the closed state, the valve 83C and the valve 84C are opened from the closed state, the valve 81D and the valve 82D are opened from the closed state, and the valve 83D and the valve 84D are opened from the closed state. The inlet valve 61X and the outlet valve 62X are changed from the open state to the closed state, the exhaust valve 63X is changed from the closed state to the open state, the inlet valve 61Y and the outlet valve 62Y are changed from the closed state to the open state, and the exhaust valve 63Y is changed from the open state to the closed state. Is done. As a result, the air that has left the purification target space 100 passes through the processing air supply line 41, the dehumidification tower 20D, the dehumidified air supply line 42, the decarburization tower 30Y, and the carbon dioxide-removed air return line 43 in order. Passes, branches, passes through the dehumidification towers 20A to 20C, 20E, 20F, joins, passes through the moisture recovery air return line 44, and returns to the purification target space 100. Therefore, the roles of the dehumidification towers 20C and 20D are changed so that the dehumidification tower 20D adsorbs moisture in the air so that the moisture adsorbed by the dehumidification tower 20C is desorbed to the air, and the decarburization tower 30X. The roles of the decarburization towers 30X and 30Y are exchanged so that the decarburization tower 30Y adsorbs the carbon dioxide in the air so that the carbon dioxide adsorbed by is adsorbed to the air. The carbon dioxide desorbed from the decarburization tower 30X is exhausted to the space vacuum through the exhaust line 45.

  Next, the valve 81D and the valve 82D are opened from the closed state, the valve 83D and the valve 84D are opened from the closed state, the valve 81E and the valve 82E are opened from the closed state, and the valve 83E and the valve 84E are opened from the closed state. Changed to As a result, the air that has left the purification target space 100 passes through the processing air supply line 41, the dehumidification tower 20E, the dehumidified air supply line 42, the decarburization tower 30Y, and the carbon dioxide-removed air return line 43 in order. Passes, branches, passes through the dehumidification towers 20A to 20D, 20F, joins, passes through the moisture recovery air return line 44, and returns to the purification target space 100. Therefore, the roles of the dehumidifying towers 20D and 20E are changed so that the dehumidifying tower 20E adsorbs moisture in the air so that the moisture adsorbed by the dehumidifying tower 20D is desorbed to the air.

  Next, the valve 81E and the valve 82E are closed from the open state, the valve 83E and the valve 84E are opened from the closed state, the valve 81F and the valve 82F are opened from the closed state, and the valve 83F and the valve 84F are closed from the open state. Changed to As a result, the air that has left the purification target space 100 passes through the processing air supply line 41, the dehumidification tower 20F, the dehumidified air supply line 42, the decarburization tower 30Y, and the carbon dioxide-removed air return line 43 in order. Passes, branches, passes through the dehumidification towers 20A to 20E, joins, passes through the moisture recovery air return line 44, and returns to the purification target space 100. Therefore, the roles of the dehumidification towers 20E and 20F are changed so that the dehumidification tower 20F adsorbs moisture in the air so that the moisture adsorbed by the dehumidification tower 20E is desorbed to the air.

  Next, the valve 81F and the valve 82F are closed from the open state, the valve 83F and the valve 84F are opened from the closed state, the valve 81A and the valve 82A are opened from the closed state, and the valve 83A and the valve 84A are closed from the open state. The inlet valve 61Y and the outlet valve 62Y are changed from the open state to the closed state, the exhaust valve 63Y is changed from the closed state to the open state, the inlet valve 61X and the outlet valve 62X are changed from the closed state to the open state, and the exhaust valve 63X is changed from the open state to the closed state. The process returns to the initial state described above.

  As a result, for each of the dehumidifying towers 20A to 20F, the flow generating device 40 passes through one of the decarburization towers 30X and 30Y after the air that has exited the purification target space 100 passes through the dehumidification tower 100, and then the purification target space 100. And the state of the second flow that returns to the purification target space 100 without passing through any of the decarburization towers 30X and 30Y after the air that has exited the purification target space 100 passes through the dehumidification tower. appear. The dehumidifying agent provided in the dehumidifying tower adsorbs moisture in the first flow state and desorbs moisture in the second flow state. The flow generator 40 generates the first flow state and the second flow state such that the time of the first flow state is shorter than the time of the second flow state.

  The above description can be generalized as follows. For each of the L dehumidification towers, the vent 22 is connected to the processing air supply line 41 via the first valve, the vent 21 is connected to the dehumidified air supply line 42 via the second valve, and the third The vent 21 is connected to the carbon dioxide-removed air return line 43 via the valve, and the vent 22 is connected to the moisture recovered air return line 44 via the fourth valve. The process air supply line 41 and the dehumidified air supply line 42 are connected via M dehumidification towers among the L dehumidification towers, and the other N dehumidification towers among the L dehumidification towers. The carbon return removed air return line 43 and the moisture recovered air return line 44 are connected. Here, L is an integer of 3 or more, M is an integer of 1 or more, N is an integer greater than M, and the sum of M and N is L or less. M may be 1 or more, and the sum of M and N may be equal to or less than L. The M dehumidification towers are configured so that the time of the first flow state is shorter than the time of the second flow state for each of the L dehumidification towers by switching between opening and closing of the first valve to the fourth valve. The dehumidifying tower is replaced, and the dehumidifying towers constituting the N dehumidifying towers are replaced.

  As described above, by making the time for desorption longer than the time for adsorption, the cycle of adsorption and desorption is accelerated. When the adsorption and desorption cycle is accelerated, the total amount of the dehumidifying agent is reduced, and the air cleaning device is made compact.

  In the above-described operation, when the decarburization tower 30X or 30Y is connected to the space vacuum, oxygen and nitrogen in the decarburization tower 30X or 30Y also flow away to the space vacuum together with carbon dioxide. When the adsorption and desorption cycle is accelerated, there arises a problem that the amount of oxygen and nitrogen flowing away in the space vacuum increases. Hereinafter, a technique for solving this problem will be described.

  Hereinafter, with reference to FIG. 3, a case will be described in which keeping using the keeping line 55 is added to the above-described operation.

  At time T0, the inlet valve 61X and the outlet valve 62X are open, the keeping pump 56 is off, the keeping valve 57 and the keeping valve 58 are closed, the exhaust valve 63X is closed, the exhaust valve 63Y is open, and the inlet valve 61Y The outlet valve 62Y is closed, the decarburization tower 30X is adsorbing carbon dioxide, and the decarburization tower 30Y is desorbing carbon dioxide.

  At time T1, the inlet valve 61X and the outlet valve 62X change from the open state to the closed state, and the keeping pump 56 changes from the off state to the on state. Accordingly, the adsorption of carbon dioxide in the decarburization tower 30X is completed.

  As described above, the dehumidification towers 20A, 20B, and 20C sequentially absorb moisture and absorb moisture in the decarburization tower 30X from time T0 to time T1 during adsorption. Moisture is desorbed in a dehumidifying tower that does not play a role.

  At time T2, the inlet valve 61Y and the outlet valve 62Y change from the closed state to the open state, the exhaust valve 63Y changes from the open state to the closed state, and the keeping valve 57 changes from the closed state to the open state. Therefore, in the decarburization tower 30Y, the desorption of carbon dioxide is completed, and the adsorption of carbon dioxide is started. And keeping is started about the decarburization tower 30X. In the keeping, the keeping pump 56 moves the air from the decarburization tower 30X to the carbon return-removed air return line 43. Even when the pressure difference between the decarburization tower 30 </ b> X and the carbon return-removed air return line 43 is small, the air is efficiently moved by the keeping pump 56.

  At time T3, the keeping pump 56 changes from the on state to the off state, the keeping valve 57 changes from the open state to the closed state, and the exhaust valve 63X changes from the closed state to the open state. Accordingly, the keeping for the decarburization tower 30X is completed, and the desorption of carbon dioxide is started in the decarburization tower 30X. Since the decarburization tower 30X is connected to the space vacuum after the air in the decarburization tower 30X is recovered by keeping, oxygen and nitrogen are prevented from flowing out to the space vacuum.

  At time T4, the inlet valve 61Y and the outlet valve 62Y change from the open state to the closed state, and the keeping pump 56 changes from the off state to the on state. Accordingly, the adsorption of carbon dioxide in the decarburization tower 30Y is completed.

  As described above, the dehumidifying towers 20D, 20E, and 20F sequentially absorb moisture and absorb moisture in the decarburization tower 30Y from time T2 to time T4 during adsorption of carbon dioxide. Moisture is desorbed in a dehumidifying tower that does not play a role.

  At time T5, the inlet valve 61X and the outlet valve 62X change from the closed state to the open state, the exhaust valve 63X changes from the open state to the closed state, and the keeping valve 58 changes from the closed state to the open state. Therefore, in the decarburization tower 30X, the desorption of carbon dioxide is completed, and the adsorption of carbon dioxide is started. Then, the keeping of the decarburization tower 30Y is started. In the keeping, the keeping pump 56 moves air from the decarburization tower 30Y to the carbon return-removed air return line 43.

  At time T6, the keeping pump 56 changes from the on state to the off state, the keeping valve 58 changes from the open state to the closed state, and the exhaust valve 63Y changes from the closed state to the open state. Therefore, the keeping for the decarburization tower 30Y is finished, and the desorption of carbon dioxide is started in the decarburization tower 30Y. Since the decarburization tower 30Y is connected to the space vacuum after the air in the decarburization tower 30Y is recovered by keeping, oxygen and nitrogen are prevented from flowing out to the space vacuum.

  At time T7, the inlet valve 61X and the outlet valve 62X change from the open state to the closed state, and the keeping pump 56 changes from the off state to the on state. Accordingly, the adsorption of carbon dioxide in the decarburization tower 30X is completed.

  As described above, the dehumidification towers 20A, 20B, and 20C sequentially absorb moisture and absorb moisture in the decarburization tower 30X from time T5 to time T7 during adsorption of carbon dioxide. Moisture is desorbed in a dehumidifying tower that does not play a role.

  At time T8, the inlet valve 61Y and the outlet valve 62Y change from the closed state to the open state, the exhaust valve 63Y changes from the open state to the closed state, and the keeping valve 57 changes from the closed state to the open state. Therefore, in the decarburization tower 30Y, the desorption of carbon dioxide is completed, and the adsorption of carbon dioxide is started. And keeping is started about the decarburization tower 30X. In the keeping, the keeping pump 56 moves the air from the decarburization tower 30X to the carbon return-removed air return line 43.

  At time T9, the keeping pump 56 changes from the on state to the off state, the keeping valve 57 changes from the open state to the closed state, and the exhaust valve 63X changes from the closed state to the open state. Accordingly, the keeping for the decarburization tower 30X is completed, and the desorption of carbon dioxide is started in the decarburization tower 30X. Since the decarburization tower 30X is connected to the space vacuum after the air in the decarburization tower 30X is recovered by keeping, oxygen and nitrogen are prevented from flowing out to the space vacuum.

  The heat pipe 34 transfers heat from one of the decarburization tower 30X and the decarburization tower 30Y that is adsorbing carbon dioxide to the other that is desorbing carbon dioxide. That is, the heat of adsorption generated on the one hand is used as the heat of desorption on the other hand. Thereby, desorption is promoted, and the above-mentioned problem that the next adsorption is performed without sufficient desorption is solved. As a result, the air purifier can be made compact. If an artificial muscle pump (not shown) circulates the heat medium enclosed in the heat pipe 34, heat transfer from one to the other is further promoted. Although inferior in terms of energy saving, a heater may be provided in each of the decarburization towers 30X and 30Y instead of the heat pipe 34.

  Each of the integration target portions 65, 66, and 67 is preferably integrated as an integrated piping structure 70 shown in FIG. The integration target portion 65 includes connection lines 46X and 48X, an inlet valve 61X, and an exhaust valve 63X. The integration target part 66 includes connection lines 46Y and 48Y, an inlet valve 61Y, and an exhaust valve 63Y. The integration target portion 67 includes connection lines 48X and 48Y and outlet valves 62X and 62Y. A case where the integration target part 67 is integrated as the integrated piping structure 70 will be described as an example. The integrated piping structure 70 includes a plate 71 in which grooves 75 and 76 are formed, and a plate 72 joined to the plate 71 so as to cover the grooves 75 and 76. The plates 71 and 72 are joined together by a joining portion 73 formed across the plates 71 and 72 so as to extend along the grooves 75 and 76. The joint 73 is formed by partially melting the plates 71 and 72 by heating and stirring the plates 71 and 72 with the tool 74 moving along the grooves 75 and 76. The grooves 75 and 76 covered with the plate 72 form flow paths corresponding to the connection lines 47X and 47Y. The outlet valve 62X and the outlet valve 62Y may be formed inside the integrated piping structure 70 or may be attached to the outside of the integrated piping structure 70.

  By the integrated piping structure 70, the flow path provided in the air cleaning device according to the present embodiment, for example, the flow path through which air or carbon dioxide flows in the first flow state or the second flow state, is two-dimensionally integrated. The air purifier is made compact.

  Most or all of the air cleaning device according to this embodiment may be formed as the integrated piping structure 70. In this case, the harmful gas remover 10, the dehumidifying towers 20A to 20F, the decarburizing towers 30X and 30Y, the processing air supply line 41, the dehumidified air supply line 42, the carbon dioxide removed air return line 43, and the moisture recovered air return. The line 44, the exhaust line 45, the first line 55a, and the second line 55b are formed as spaces sandwiched between the plates 71 and 72, respectively. The pump 50, the keeping pump 56, and the above-described valve may be formed inside the integrated piping structure 70 or may be attached to the outside of the integrated piping structure 70. In this case, the dehumidifying agent is accommodated in the space corresponding to the dehumidifying towers 20A to 20F, and the decarburizing agent is accommodated in the space corresponding to the decarburizing towers 30X and 30Y. By forming the space corresponding to the dehumidification towers 20A to 20F and the space corresponding to the decarburization towers 30X and 30Y in a rectangular parallelepiped shape, the air cleaning device while securing the volumes of the dehumidification towers 20A to 20F and the decarburization towers 30X and 30Y Can be made compact.

(Second Embodiment)
As shown in FIG. 5, the air purifying apparatus according to the second embodiment of the present invention is provided with a pressure equalizing line 51 and a pressure equalizing valve 54 in which the pressure equalizing valve 53 is provided in the air purifying apparatus according to the first embodiment. The pressure equalization line 52 is added, and the second line 55b and the keeping valve 58 are removed. The pressure equalization line 51 connects the vent 31 of the decarburization tower 30X and the vent 31 of the decarburization tower 30Y. The pressure equalization line 52 connects the vent 32 of the decarburization tower 30X and the vent 32 of the decarburization tower 30Y. The air purifying apparatus according to the present embodiment provides another technique for solving the problem that oxygen and nitrogen are lost to the space vacuum.

  Hereinafter, the operation of the air cleaning device according to the present embodiment will be described.

  Carbon dioxide is adsorbed in the decarburization tower 30X, and carbon dioxide is desorbed in the decarburization tower 30Y. At this time, the inlet valve 61X, the outlet valve 62X, and the exhaust valve 63Y are opened, and the inlet valve 61Y, the outlet valve 62Y, the exhaust valve 63X, the pressure equalizing valve 53, the pressure equalizing valve 54, and the keeping valve 57 are closed. While carbon dioxide is adsorbed in the decarburization tower 30X, as described above, the dehumidification towers 20A, 20B, and 20C are sequentially responsible for adsorbing moisture, and in the dehumidification tower that does not play the role of adsorbing moisture. Minutes are desorbed.

  Next, pressure equalization is performed in the decarburization towers 30X and 30Y. At this time, the inlet valves 61X and 61Y, the outlet valves 62X and 62Y, the exhaust valves 63X and 63Y, the keeping valve 57 are closed, and the pressure equalizing valves 53 and 54 are opened. As a result, the air moves from the high pressure decarburization tower 30 </ b> X to the low pressure decarburization tower 30 </ b> Y via the pressure equalization line 51 and the pressure equalization line 52.

  Next, air is recovered from the decarburization tower 30X to the decarburization tower 30Y. At this time, the inlet valves 61X and 61Y, the outlet valves 62X and 62Y, the exhaust valves 63X and 63Y, the pressure equalizing valves 53 and 54 are closed, the keeping valve 57 is opened, and the keeping pump 56 airs from the decarburizing tower 30X to the decarburizing tower 30Y. To move. Even when the pressure difference between the decarburization tower 30X and the decarburization tower 30Y is small, the air is efficiently moved by the keeping pump 56.

  Next, carbon dioxide is desorbed in the decarburization tower 30X, and carbon dioxide is adsorbed in the decarburization tower 30Y. At this time, the inlet valve 61X, the outlet valve 62X, the exhaust valve 63Y, the pressure equalizing valve 53, the pressure equalizing valve 54, and the keeping valve 57 are closed, and the inlet valve 61Y, the outlet valve 62Y, and the exhaust valve 63X are opened. While carbon dioxide is adsorbed in the decarburization tower 30Y, as described above, the dehumidification towers 20D, 20E, and 20F sequentially play a role of absorbing moisture and in a dehumidification tower that does not play a role of absorbing moisture. Minutes are desorbed.

  Next, pressure equalization is performed in the decarburization towers 30X and 30Y. At this time, the inlet valves 61X and 61Y, the outlet valves 62X and 62Y, the exhaust valves 63X and 63Y, the keeping valve 57 are closed, and the pressure equalizing valves 53 and 54 are opened. As a result, the air moves from the high pressure decarburization tower 30Y to the low pressure decarburization tower 30X via the pressure equalization lines 51 and 52.

  Next, air is recovered from the decarburization tower 30Y to the decarburization tower 30X. At this time, the inlet valves 61X and 61Y, the outlet valves 62X and 62Y, the exhaust valves 63X and 63Y, the pressure equalizing valves 53 and 54 are closed, the keeping valve 57 is opened, and the keeping pump 56 airs from the decarburization tower 30Y to the decarburization tower 30X. To move.

  Next, returning to the beginning, carbon dioxide is adsorbed in the decarburization tower 30X, and carbon dioxide is desorbed in the decarburization tower 30Y.

  Uniform pressure and air recovery (keeping) prevent nitrogen and oxygen from flowing into the space vacuum. Only one of pressure equalization and recovery may be performed.

(Third embodiment)
The air purification apparatus according to the third embodiment of the present invention is obtained by partially changing the air purification apparatus according to the first embodiment or the air purification apparatus according to the second embodiment. As shown in FIG. 6, in the air purifying apparatus according to the present embodiment, the dehumidification towers 20A to 20F are arranged on the circumference so as to form a circular permutation to form the dehumidification tower aggregate 24, and the valves 82A to 82A 82F and valves 83A to 83F are replaced with the valve plate 25, and valves 81A to 81F and valves 84A to 84F are replaced with the valve plate 26.

  The valve plate 25 includes a dehumidified air port 25 a connected to the dehumidified air supply line 42 and a carbon dioxide removed air port 25 b connected to the carbon dioxide removed air return line 43. The valve plate 26 includes a processing air port 26 a connected to the processing air supply line 41 and a moisture recovered air port 26 b connected to the moisture recovered air return line 44. The valve plate pair formed by the valve plates 25 and 26 and the dehumidifying tower assembly 24 rotate relatively in one direction. By this relative rotation, the rotational positions of the valve plate pair and the dehumidifying tower assembly 24 are cyclic in the order of the first rotational position, the second rotational position,..., The sixth point position, and the first rotational position. To change.

  In the first rotation position, the dehumidified air port 25a and the processing air port 26a are connected via the dehumidifying tower 20A, and the carbon dioxide-removed air port 25b and the moisture recovered air port 26b are connected via the dehumidifying towers 20C to 20E. Connected. Here, the dehumidification towers 20C to 20E are connected in parallel. At this time, moisture is adsorbed in the dehumidifying tower 20A, and moisture is desorbed in the dehumidifying towers 20C to 20E.

  In the second rotation position, the dehumidified air port 25a and the processing air port 26a are connected via the dehumidifying tower 20B, and the carbon dioxide-removed air port 25b and the moisture recovered air port 26b are connected via the dehumidifying towers 20D to 20F. Connected. Here, the dehumidification towers 20D to 20F are connected in parallel. At this time, moisture is adsorbed in the dehumidifying tower 20B, and moisture is desorbed in the dehumidifying towers 20D to 20F.

  In the third rotation position, the dehumidified air port 25a and the processing air port 26a are connected via the dehumidifying tower 20C, and the carbon dioxide-removed air port 25b and the moisture recovered air port 26b are connected to the dehumidifying towers 20A, 20E, and 20F. Connected through. Here, the dehumidification towers 20A, 20E, and 20F are connected in parallel. At this time, moisture is adsorbed in the dehumidifying tower 20C, and moisture is desorbed in the dehumidifying towers 20A, 20E, and 20F.

  In the fourth rotation position, the dehumidified air port 25a and the processing air port 26a are connected via the dehumidifying tower 20D, and the carbon dioxide-removed air port 25b and the moisture recovered air port 26b are connected to the dehumidifying towers 20A, 20B, and 20F. Connected through. Here, the dehumidification towers 20A, 20B and 20F are connected in parallel. At this time, moisture is adsorbed in the dehumidifying tower 20D, and moisture is desorbed in the dehumidifying towers 20A, 20B, and 20F.

  In the fifth rotation position, the dehumidified air port 25a and the processing air port 26a are connected via the dehumidifying tower 20E, and the carbon dioxide-removed air port 25b and the moisture recovered air port 26b are connected via the dehumidifying towers 20A to 20C. Connected. Here, the dehumidification towers 20A to 20C are connected in parallel. At this time, moisture is adsorbed in the dehumidifying tower 20E, and moisture is desorbed in the dehumidifying towers 20A to 20C.

  In the sixth rotation position, the dehumidified air port 25a and the processing air port 26a are connected via the dehumidifying tower 20F, and the carbon dioxide-removed air port 25b and the moisture recovered air port 26b are connected via the dehumidifying towers 20B to 20D. Connected. Here, the dehumidification towers 20B to 20D are connected in parallel. At this time, moisture is adsorbed in the dehumidifying tower 20F, and moisture is desorbed in the dehumidifying towers 20B to 20D.

  Therefore, for each of the dehumidifying towers 20A to 20F, the time of the first flow state for moisture adsorption is shorter than the time of the second flow state for moisture desorption.

  The above description can be generalized as follows. L dehumidifying towers form a dehumidifying tower assembly 24. The dehumidified air port 25a and the process air port 26a are connected via M of the L dehumidifying towers and the treated air port 26a is connected, and the N2 dehumidifying towers of the L dehumidifying towers are connected to form dioxide dioxide. The carbon-removed air port 25b and the moisture-recovered air port 26b are connected. Here, L is an integer of 3 or more, M is an integer of 1 or more, N is an integer greater than M, and the sum of M and N is L or less. M may be 1 or more, and the sum of M and N may be equal to or less than L. By the relative rotation of the dehumidifying tower assembly 24 and the valve plate pair, the dehumidifying towers constituting the M dehumidifying towers are replaced, and the dehumidifying towers constituting the N dehumidifying towers are replaced.

  According to the present embodiment, switching of connections between the dehumidification towers 20A to 20F and the processing air supply line 41, the dehumidified air supply line 42, the carbon dioxide-removed air return line 43, and the moisture recovered air return line 44 is performed. Is accelerated, so that the cycle of adsorption and desorption is accelerated. Therefore, the total amount of the dehumidifying agent is reduced, and the air cleaning device is made compact.

  The dehumidifying tower assembly 24 and the valve plates 25 and 26 may be provided in the integrated piping structure 70 described above. Thereby, the air purifying apparatus which concerns on this embodiment is further reduced in size.

  In the above description, the moisture once dehumidified by the dehumidifying unit 20 is returned to the air that has passed through the decarburizing tower 30X or 30Y, but the air that has left the purification target space 100 does not pass through the decarburizing unit 30. The air purifier according to each of the above embodiments is configured to form a flow path that passes through the dehumidifying unit 20 and returns to the purification target space 100 and returns the moisture once adsorbed by the dehumidifying unit 20 to the air flowing through the flow path. May be.

  Pressure equalizing valves 53 and 54, keeping valves 57 and 58, inlet valves 61X and 61Y, outlet valves 62X and 62Y, exhaust valves 63X and 63Y, valves 81A to 81F, 82A to 82F, 83A to 83F, 84A to 84F It is preferably opened and closed by a muscle actuator.

  In the air purifying apparatus according to each of the above embodiments, the above-described keeping and pressure equalization may be applied to the dehumidifying towers 20A to 20F.

  In the air cleaning apparatus according to each of the above embodiments, the number of decarburization towers may be plural, and may be three or more. The ratio of the cycle of the adsorption and desorption cycle for the decarburization tower and the cycle of the adsorption and desorption cycle for the dehumidification tower is not limited to the above example.

  The air purifying apparatus according to each of the above embodiments can be applied to the removal of carbon dioxide from a closed space in fields other than the space field, for example, aircraft, automobiles, passenger ships, ships, chemical control clothes, and diving work clothes. . Except for aircraft flying at high altitudes, the decarburization tower cannot be decompressed simply by connecting the decarburization tower to the external space. In order to promote the desorption of oxygen dioxide in the decarburization tower, it is preferable to provide a pump for reducing the pressure in the decarburization towers 30X and 30Y in the exhaust line 45.

  The techniques according to the above embodiments can be appropriately combined.

FIG. 1 is a schematic view of a conventional carbon dioxide removal apparatus. FIG. 2 is a schematic view of the air cleaning device according to the first embodiment of the present invention. FIG. 3 is a sequence diagram showing a keying operation. FIG. 4 is a perspective view of the integrated piping structure. FIG. 5 is a schematic view showing a keeping line of an air cleaning device according to the second embodiment of the present invention. FIG. 6 is a perspective view of a dehumidification tower of the air cleaning device according to the third embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Toxic gas removal device 20 ... Dehumidification part 20A-20F ... Dehumidification tower 21, 22 ... Vent 24 ... Dehumidification tower assembly 25, 26 ... Valve plate 25a ... Dehumidified air port 25b ... Carbon dioxide removed air port 26a ... Process air port 26b ... Moisture-recovered air port 30 ... Decarburization section 30X, 30Y ... Decarburization tower 31, 32 ... Vent 34 ... Heat pipe 40 ... Flow generator 41 ... Process air supply line 42 ... Dehumidified air supply Line 43 ... Carbon dioxide removed air return line 44 ... Moisture recovered air return line 45 ... Exhaust lines 46X, 46Y, 47X, 47Y, 48X, 48Y ... Connection line 50 ... Pumps 51, 52 ... Pressure equalization lines 53, 54 ... Pressure equalizing valve 55 ... Keeping line 55a ... First line 55b ... Second line 56 ... Keeping pumps 57, 58 ... Keeping valve 61X 61Y ... Inlet valve 62X, 62Y ... Outlet valve 63X, 63Y ... Exhaust valve 65-67 ... Integration target part 70 ... Integrated piping structure 71, 72 ... Plate 73 ... Joint part 74 ... Tools 75, 76 ... Grooves 81A-81F , 82A to 82F, 83A to 83F, 84A to 84F ... Valve 100 ... Space to be purified 201, 202 ... Dehumidifier bed 211, 212 ... Carbon dioxide absorbent bed

Claims (16)

Three or more dehumidification towers,
A plurality of decarburization towers equipped with a decarburizing agent that adsorbs and desorbs carbon dioxide;
For each of the plurality of dehumidifying towers, a flow generator that generates the first flow state and the second flow state so that the time of the first flow state is shorter than the time of the second flow state. Equipped,
In the state of the first flow, after the air that has exited the purification target space passes through the dehumidification tower, it passes through one of the plurality of decarburization towers and returns to the purification target space,
In the state of the second flow, after the air that has left the purification target space passes through the dehumidification tower, it returns to the purification target space without passing through any of the plurality of decarburization towers,
In the state of the first flow, the dehumidifying agent provided in the dehumidifying tower adsorbs moisture,
In the second flow state, the dehumidifying agent desorbs moisture. The air cleaning apparatus according to claim 1, wherein the plurality of decarburization towers include a first decarburization tower and a second decarburization tower connected to the first decarburization tower via a heat pipe. The air purifier according to claim 2, further comprising an artificial muscle pump that circulates the heat medium sealed in the heat pipe. The flow generator includes a flow path through which air flows in the first flow state or the second flow state,
The flow path is formed in an integrated piping structure,
The integrated piping structure includes a first plate in which a groove corresponding to the flow path is formed, and a second plate joined to the first plate so as to cover the groove. An air purifier according to claim 1. The plurality of dehumidification towers or the plurality of decarburization towers are formed in the integrated piping structure,
The air cleaner according to claim 4, wherein the dehumidifying agent or the decarburizing agent is accommodated in a space sandwiched between the first plate and the second plate. The air cleaning device according to claim 5, wherein the space is formed in a rectangular parallelepiped shape. The plurality of decarburization towers include a first decarburization tower connected to the space vacuum via a first exhaust valve, and a second decarburization tower connected to the space vacuum via a second exhaust valve,
The air purifier according to claim 1, wherein the first decarburization tower and the second decarburization tower are connected via a pressure equalizing valve. In the state of the first flow, after the air exiting the purification target space passes through the dehumidification tower, it passes through either the first decarburization tower or the second decarburization tower and returns to the purification target space. ,
In the state of the second flow, after the air exiting the purification target space passes through the dehumidification tower, it returns to the purification target space without passing through either the first decarburization tower or the second decarburization tower. ,
The flow generator includes the first decarburization tower when the first exhaust valve, the second exhaust valve, and the pressure equalizing valve are closed and the state of the first flow does not occur in any of the plurality of dehumidification towers. And an air cleaning device according to claim 7, further comprising a keeping pump that moves air from one of the second decarburization towers to the other. Each of the plurality of decarburization towers is connected to a space vacuum through an exhaust valve,
The flow generator includes a dehumidified air supply line to which the plurality of decarburization towers and the plurality of dehumidification towers are connected via valves, and the plurality of decarburization towers and the plurality of dehumidification towers via valves. and carbon dioxide-removed air return line is connected, and a key ping pump,
The air that has exited the purification target space passes through the first dehumidification tower corresponding to the state of the first flow among the plurality of dehumidification towers, and the air that has passed through the first dehumidification tower passes through the dehumidified air supply line. The air passing through the dehumidified air supply line passes through the first decarburization tower among the plurality of decarburization towers, and the air passing through the first decarburization tower passes through the carbon dioxide-removed air return line. The air that has passed through the carbon dioxide-removed air return line passes through the second dehumidifying tower corresponding to the state of the second flow among the plurality of dehumidifying towers, and the air that has passed through the second dehumidifying tower is subjected to the purification. Return to the target space,
A valve for connecting a second decarburization tower of the plurality of decarburization towers to the dehumidified air supply line, a valve for connecting the second decarburization tower to the carbon dioxide-removed air return line, and the second decarburization tower The air purifier according to claim 1 , wherein the keeping pump moves air from the second decarburization tower to the carbon dioxide-removed air return line when an exhaust valve that connects the charcoal tower to the space vacuum is closed . The flow generator is
A first valve plate comprising a dehumidified air port and a carbon dioxide removed air port;
A second valve plate comprising a processing air port and a moisture recovered air port;
A processing air supply line through which air flows from the processing target space to the processing air port;
A dehumidified air supply line through which air flows from the dehumidified air port to the plurality of decarburization towers;
A carbon dioxide removed air return line through which air flows from the multiple decarburization tower to the carbon dioxide removed air port;
A moisture recovered air return line through which air flows from the moisture recovered air port to the treatment target space,
The plurality of dehumidifying towers are arranged on the circumference to form a dehumidifying tower assembly,
The processing air port and the dehumidified air port are connected via one or more M dehumidification towers of the plurality of dehumidification towers,
The carbon dioxide-removed air port and the moisture-recovered air port are connected via other N dehumidifying towers of more than M among the plurality of dehumidifying towers,
The dehumidifying tower assembly is rotated relative to the valve plate pair formed by the first valve plate and the second valve plate, so that the dehumidifying towers constituting the M dehumidifying towers are replaced, The air purifier according to claim 1, wherein the dehumidifying towers constituting the N dehumidifying towers are replaced. For each of the three or more multiple dehumidification towers, a first flow state is generated in which the air that has exited the purification target space passes through the dehumidification tower and then passes through one of the multiple decarburization towers to return to the purification target space. And steps to
Regarding the dehumidification tower, the state of the second flow in which the air that has exited the purification target space passes through the dehumidification tower and then returns to the purification target space without passing through any of the plurality of decarburization towers. And a step that occurs so as to be longer than the state of
Each of the plurality of decarburization towers includes a decarburizing agent that adsorbs and desorbs carbon dioxide,
In the step of generating the state of the first flow, the dehumidifying agent provided in the dehumidifying tower adsorbs moisture,
In the step of generating the second flow state, the dehumidifying agent desorbs moisture. One of the first decarburization tower and the second decarburization tower provided in the decarburization unit adsorbs carbon dioxide and the other desorbs carbon dioxide;
Exchanging roles of the one and the other;
A processing air supply line and a dehumidified air supply line are connected via one or more M dehumidification towers among three or more dehumidification towers provided in the dehumidification unit, and M of the plurality of dehumidification towers Connecting the carbon dioxide-removed air return line and the moisture-recovered air return line via more N other dehumidification towers;
Replacing the dehumidifying towers constituting the M dehumidifying towers, and replacing the dehumidifying towers constituting the N dehumidifying towers,
Each of the plurality of dehumidifying towers includes a dehumidifying agent that adsorbs and desorbs moisture.
In the step in which the one adsorbs carbon dioxide and the other desorbs carbon dioxide,
Air from the processing target space flows through the processing air supply line to the dehumidifying unit,
The air dehumidified in the dehumidifying section flows to the one through the dehumidified air supply line,
On the other hand, air from which carbon dioxide has been removed flows to the dehumidifying section through the carbon dioxide-removed air return line,
The air whose moisture has been returned in the dehumidifying section returns to the processing target space through the moisture recovered air return line,
An air cleaning method in which carbon dioxide desorbed on the other side is exhausted to an external space. The external space is a space vacuum;
The air cleaning method according to claim 12, further comprising a step of equalizing the pressures of the one and the other. The air cleaning method according to claim 13, further comprising: moving air from the one to the other using a pump. Each of the first decarburization tower and the second decarburization tower is connected to the carbon dioxide-removed air return line via an on-off valve,
The air cleaning method according to claim 12, further comprising moving air from the one side to the carbon dioxide-removed air return line using a pump. The plurality of dehumidifying towers are arranged on the circumference to form a dehumidifying tower assembly,
The valve plate pair includes a first valve plate having a dehumidified air port and a carbon dioxide-removed air port, and a second valve plate having a process air port and a moisture recovered air port,
The dehumidified air port is connected to the dehumidified air supply line;
The carbon dioxide removed air port is connected to the carbon dioxide removed air return line;
The processing air port is connected to the processing air supply line;
The moisture recovered air port is connected to the moisture recovered air return line;
The processing air port and the dehumidified air port are connected via the M dehumidifying towers,
The carbon dioxide-removed air port and the moisture-recovered air port are connected via the N dehumidifying towers,
The air cleaning method according to any one of claims 12 to 15, wherein in the replacing step, the dehumidifying tower assembly is rotated relative to the valve plate pair.

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