WO2021117260A1

WO2021117260A1 - Gas removal/enrichment device

Info

Publication number: WO2021117260A1
Application number: PCT/JP2020/006150
Authority: WO
Inventors: 吉田和行; 井上宏志; 梅崎哲春
Original assignee: 株式会社西部技研
Priority date: 2019-12-13
Filing date: 2020-02-18
Publication date: 2021-06-17
Also published as: TW202122150A; JP7455566B2; JP2021094485A; TWI813857B

Abstract

[Problem] To provide a gas removal/enrichment device which does not require a heating means for regenerating an adsorptive honeycomb rotor and which is energy-efficient. [Solution] This gas removal/enrichment device uses an adsorptive honeycomb rotor that carries a low-temperature regenerative adsorbent, wherein temperature increase by a blower is used as a heating means for increasing the temperature of a gas for regeneration, and thus a heating means such as a regeneration heater or a hot water coil is not required. Therefore, it is possible to reduce the heating energy required for regeneration, conserve energy, and lower the running cost.

Description

Gas removal concentrator

According to the present invention, in order to remove or concentrate a target substance from a gas to be processed composed of various gas components, adsorption / desorption is performed by a temperature difference using an adsorption honeycomb rotor carrying an adsorbent that can be regenerated at low temperature. When low-temperature regeneration is possible in the characteristic gas removal concentrator, instead of using a regeneration heater or the like as a normal regeneration gas heating means, heating is performed only by raising the temperature with a regeneration blower for blowing the regeneration gas. It is about a gas removal concentrator that can save energy and achieve energy saving.

Conventionally, as a device capable of separating and removing a gaseous substance to be removed from the air to be treated in a concentrated state at a low temperature, for example, as seen in Patent Document 1, a breathable adsorption honeycomb rotor holding an amine-based absorbent is used. There is known an absorption type removal / concentration device that can secure the substance recovery rate of the device while suppressing the regeneration energy by separating the target substance by using the enthalpy difference between the treatment target air and the regeneration air. Further, by regenerating at a low temperature, the problems of oxidative deterioration and odor of the amine-based absorber are reduced.

Regarding low temperature regeneration, Patent Document 2 discloses a low temperature regeneration desiccant dehumidifier. The low-temperature regeneration desiccant dehumidifier uses a desiccant rotor carrying an adsorbent such as a polymer sorbent, and in the cooling mode, the desiccant rotor can be regenerated using the energy of the return air as the regeneration energy. The hot water coil, which is the source, is unnecessary for basic operation and has energy saving properties. The hot water coil in the front stage of the regeneration inlet acts as a return air preheating part for heating the return air used for regeneration when the dehumidifying capacity of the cold / hot water coil in the front stage of the treatment inlet is insufficient in the cooling mode. Regenerate and secure dehumidifying capacity. On the other hand, in the heating mode, the processing side and the regeneration side of the desiccant rotor in the cooling mode are switched, and the outside air is heated through the hot water coil to supply the humidified air to the room.

Japanese Unexamined Patent Publication No. 2017-154063 Japanese Patent No. 5669587

What is disclosed in Patent Document 1 is a cooling coil, a heating coil, a Berche element, an electric heater, a condenser (condenser) of a steam heater or a heat pump, and an evaporator (evaporator) as temperature adjusting means for heating the regenerated air. ), Etc., and although it is a low-temperature regeneration, it requires energy for heating.

The one described in Patent Document 2 basically does not require a hot water coil which is a regenerated air heating means in the cooling mode, but when the dehumidifying capacity of the cold / hot water coil in the stage before the treatment inlet is insufficient, or when the heating means during heating is insufficient. As a result, a hot water coil is required, and it is necessary to provide a heating means.

In view of this situation, the main subject of the present invention is a gas removal concentrator using an adsorption honeycomb rotor carrying an adsorbent that can be regenerated at a low temperature, and a blower as a heating means for raising the temperature of the regenerating gas when the gas can be regenerated at a low temperature. It is an object of the present invention to provide a gas removal concentrator capable of reducing renewable energy and running cost without requiring a heating means such as a regeneration heater or a hot water coil by utilizing the temperature rise by the above. In the present invention, "low temperature regeneration" means regeneration with a regeneration gas having a temperature of 50 ° C. or lower (hereinafter, all temperatures are referred to as "Celsius").

In order to solve the above problems, the present invention has an adsorption honeycomb rotor, and the adsorption honeycomb rotor is divided into at least a processing zone and a regeneration zone, and the processing target gas is ventilated through the processing zone to be treated. The target substance contained in the gas is adsorbed on the honeycomb to be separated and removed from the gas to be treated, and in the regeneration zone, the regeneration gas is ventilated to desorb the target substance adsorbed by the honeycomb in the treatment zone with the regeneration gas. It is a gas removal concentrator that concentrates by letting it concentrate and regenerates the adsorbent carried on the rotor part, and instead of using a regeneration heater as a regeneration heating means, it heats only by raising the temperature with a regeneration blower, so for heating It eliminates the need for energy and makes it possible to achieve energy saving.

The gas removal and concentrating device of the present invention is configured as described above, and by ventilating the treatment target gas through the treatment zone, the target substance contained in the treatment target gas is adsorbed on the honeycomb and separated and removed from the treatment target gas. In the regeneration zone, the target substance adsorbed by the honeycomb in the treatment zone is desorbed and concentrated in the regeneration air by ventilating the regeneration gas, and the supported adsorbent of the rotor portion is regenerated. When the honeycomb can be regenerated at a low temperature, it does not require a heating means such as a regeneration heater and is heated only by raising the temperature with a regenerating blower. Therefore, energy for heating is not required, and energy saving can be achieved. Running cost can be reduced.

For example, in the gas removal and concentrating device according to the present invention, even if an amine-based absorbent that easily causes performance deterioration due to temperature is used as an adsorbent that can be regenerated at low temperature, oxidative deterioration and odor of the absorbent can be suppressed. In addition, it can be easily operated even in an environment without utilities such as a heat pump and hot water. Furthermore, since a regeneration heater and a heat exchanger are not required, the entire device can be miniaturized, leading to a reduction in initial cost.

FIG. 1 is a flow chart of the first embodiment of the gas removing and concentrating device of the present invention. FIG. 2 is a flow chart of the second embodiment of the gas removing and concentrating device of the present invention. FIG. 3 is a flow chart in Example 3 of the gas removing and concentrating device of the present invention.

The present invention has an adsorption honeycomb rotor carrying an adsorbent that can be regenerated at a low temperature, and divides the adsorption honeycomb rotor into at least a treatment zone and a regeneration zone. The structure is such that the gas to be treated is ventilated to the treatment zone, the target substance is separated and removed from the gas to be treated, and the regenerative gas whose temperature has been raised through the regeneration blower is ventilated to the regeneration zone to desorb the adsorbed target substance. It is set to.

Hereinafter, Example 1 of the gas removing and concentrating device of the present invention will be described in detail with reference to FIG. Reference numeral 1 denotes an adsorption honeycomb rotor, which is a non-combustible sheet such as ceramic fiber paper or glass fiber paper that is corrugated and wound into a rotor shape. For example, an amine-based solid absorbent is supported. The adsorption honeycomb rotor 1 is divided into a processing zone 2, a regeneration zone 3, and a purge zone 4, and the adsorption honeycomb rotor 1 rotates in this order to continuously remove and concentrate the target substance from the gas to be processed.

By ventilating the treatment target gas into the treatment zone 2 and adsorbing the target substance such as carbon dioxide contained in the treatment target gas on the honeycomb to separate and remove it from the treatment target gas, the concentration of the target substance is reduced and the treatment blower. It is supplied or exhausted to the supply destination through 5. The gas temperature rises by branching a part of the gas supplied to the treatment zone and ventilating the purge zone 4. Further, the gas that has passed through the purge zone 4 is passed through the regeneration blower 6, the heated regeneration gas is ventilated to the regeneration zone 3, and the target substance adsorbed on the honeycomb is desorbed on the regeneration gas, and the concentrated purpose is achieved. Gas containing substances is supplied or exhausted to the supply destination.

As described in Patent Document 2, not only the dehumidifying device but also the device using the adsorption honeycomb rotor usually has a blower arranged on the regeneration outlet side. One reason for this is that a regeneration heater or the like is arranged as a heating means on the regeneration inlet side, but in the case of a removal application in which the treatment outlet gas is supplied to the supply destination, regeneration is performed with respect to the treatment inlet / treatment outlet. This is because the inlet and the regeneration outlet have a negative pressure, and the amount of leakage of the target substance desorbed from the regeneration side to the treatment side is reduced, so that the removal efficiency of the target substance on the treatment outlet side is improved.

On the other hand, the regeneration blower 6 of the first embodiment according to the present invention is arranged on the regeneration inlet side. In the case of a concentration application that supplies the regenerated outlet gas to the supply destination, the processing inlet / processing outlet has a negative pressure with respect to the regenerating inlet / regenerating outlet, and the gas on the processing side having a low target substance concentration from the processing side to the regenerating side Since the amount of leakage is reduced, the concentration performance is improved. However, in the removal application, since the treatment outlet gas from which the target substance has been removed is supplied to the supply destination, a leak may occur from the regeneration inlet side to the treatment outlet side, and the removal efficiency may deteriorate. Therefore, a purge zone 4 is provided after the regeneration zone 3 along the rotor rotation direction to reduce leakage between the processing side and the regeneration side.

If the wind that has passed through the blower is blown directly into the duct, wind noise may occur due to the drift. In building air conditioning, wind noise causes noise and can be a fatal problem. In the first embodiment, since the regeneration gas after passing through the regeneration blower 6 is ventilated to the adsorption honeycomb rotor 1 on the regeneration side, it is rectified and the wind noise is reduced by the sound absorbing effect of the adsorption honeycomb rotor 1. Therefore, it is possible to reduce noise and vibration when the gas removing and concentrating device according to the present invention is installed indoors, and the device can be installed in a machine room or the like.

The temperature rise by the blower differs depending on the type of blower. If it is a centrifugal blower such as a plug fan or a turbo fan, the temperature is about 3 ° C., but if it is a blower capable of generating a high static pressure (for example, a vortex blower such as a vortex blower), the temperature is raised by 10 ° C. or more. For example, if the outside air is 20 ° C., the temperature rises to about 30 ° C. after passing through the purge. After that, the temperature is further raised by 3 to 10 ° C. through a blower.

In buildings in subtropical areas such as Thailand and Singapore, hot water is hardly supplied, and heating with an electric heater, exhaust heat from a heat pump, or exhaust heat from a chiller is required to obtain regenerated heating gas. Since the gas removal and concentrating device according to the present invention does not require these and can cover the regeneration inlet temperature only by raising the temperature with a blower, it can be particularly effective in the subtropical region where hot water cannot be expected.

In the present invention, the adsorbent is required to have the property of being able to desorb the target substance even at a low temperature of 50 ° C. or lower. When the target substance is carbon dioxide, for example, an amine-supported solid absorbent is used as the adsorbent, but by regenerating at a low temperature, there is an effect of reducing thermal deterioration and extending the life of the adsorbed honeycomb rotor. Furthermore, it is possible to suppress the generation of odors from the adsorption honeycomb rotor such as amine odors due to the decomposition of amines.

The present invention is not limited to the flow shown in FIG. 1, and a part of the processing outlet gas that has passed through the processing zone 2, the outside air, the return air from the room, and the like may be introduced into the purge zone 4. Further, a configuration may be configured in which either one or both of the processing side and the reproducing side are circulated.

Further, if necessary, a precooler, an aftercooler, a humidity adjusting means, etc. may be provided, or the processing blower 5 may be installed on the processing inlet side. Blowers other than the regenerative blower 6 may be arranged at an appropriate location and added to the blower as needed.

Further, the purge zone may be eliminated and only the processing zone and the regeneration zone may be configured.
In this case, leakage from the regeneration side to the treatment side becomes a problem. For example, when the target substance is carbon dioxide, the carbon dioxide concentration of the outside air is as low as about 450 ppm, so even if the outside air leaks to the treatment outlet side, the treatment is performed. The carbon dioxide concentration at the outlet is only increased by several tens of ppm. By providing a purge zone and weighing the initial cost, we can make proposals according to the requirements.

In the flow according to the second embodiment of the present invention of FIG. 2, the difference from the first embodiment is that the pre-purge zone 7 is provided. In this way, by providing the pre-purge zone 7 in front of the regeneration zone 3 and the purge zone 4 after it, the leak can be further reduced.

The gas flow in FIG. 2 is basically the same as that in FIG. 1, but the gas that has passed through the purge zone 4 and the gas that has passed through the pre-purge zone 7 are mixed and passed through the regeneration blower 6 to raise the temperature. , Ventilate the reproduction zone 3.

The present invention is not limited to the flow shown in FIG. 2, and the purge zone 4 may be configured to introduce a part of the processing outlet gas that has passed through the processing zone 2, the outside air, and the return air from the room. .. Similarly, not only the outside air but also the return air from the room, a part of the gas to be introduced into the treatment zone, a part of the treatment outlet gas that has passed through the treatment zone, and the like may be introduced into the pre-purge 7. The gas may be configured to circulate between the purge zone 4 and the pre-purge zone 7. Further, a configuration may be configured in which either one or both of the processing side and the reproducing side are circulated.

If necessary, a pre-cooler, an after-cooler, a humidity adjusting means, etc. may be provided. Blowers other than the regenerative blower 6 may be arranged at an appropriate location and added to the blower as needed.

In the flow according to the third embodiment of the present invention of FIG. 3, the difference from the second embodiment is that a part of the regeneration outlet gas is introduced into the pre-purge zone 7. When concentrating the target substance, the concentration can be further increased by circulating a part of the regenerated outlet gas.

The regeneration outlet chamber of the chamber (not shown), which is a means of separating the zones, eliminates the zone partition between the pre-purge inlet and the regeneration outlet so that part of the regeneration outlet gas is returned directly to the pre-purge inlet in the chamber. When configured, it leads to cost reduction of the chamber. The form is not limited to this, and a part of the gas that has passed through the regeneration outlet chamber may be introduced from outside the chamber through a duct to the pre-purge inlet.

The present invention is not limited to the flow shown in FIG. 3, and a part of the processing outlet gas that has passed through the processing zone 2, the outside air, the return air from the room, and the like may be introduced into the purge zone 4.

If necessary, a pre-cooler, an after-cooler, a humidity adjusting means, etc. may be provided. Blowers other than the regenerative blower 6 may be arranged at an appropriate location and added to the blower as needed. Further, the processing side may be circulated.

Further, an air volume adjusting device such as a damper or a valve is provided in one or both of the pipes for sending gas from the outlet of the purge zone 4 and the outlet of the pre-purge zone 7 of FIGS. The configuration may be such that the target substance removal performance on the treatment outlet side and the target substance concentration performance on the regeneration outlet side can be controlled so as to be controllable.

In many cases, a control panel is integrally attached to a general dehumidifying device or a device such as the present invention. Normally, the temperature inside the control panel rises due to heat generated by internal equipment or the like, which may lead to a malfunction of the control panel. Therefore, a small fan or the like for cooling is provided. In order to recover the heat for this temperature rise, the control panel is provided with an air intake port, an air outlet is provided at a position opposite to the air intake port, and a pipe connecting the air intake port to the purge inlet and outlet is provided. May be good. Further, for example, the pipe may be passed near the motor of each blower to recover the heat emitted from each motor to the outside. If the air outlet is not provided with a purge zone, the air outlet may be configured to be provided with a pipe connected to the inlet of the regeneration zone.

In the flow shown in FIG. 1, a carbon dioxide removal and concentration experiment was performed using a gas removal and concentration device equipped with an adsorption honeycomb rotor having a diameter of φ200 mm and a thickness of 200 mm. The carbon dioxide concentration supplied to the treatment inlet side and the purge inlet side was set to about 500 ppm, which is an atmospheric condition. When the equipment that constitutes the flow of FIG. 1 is used as the device (pattern 1), an air intake port is provided in the control panel in addition to those devices, and an air intake port is provided at a position opposite to the device to take out air. When a pipe is provided from the mouth to the purge inlet, and the pipe is passed near the motors of the processing blower and the regeneration blower to recover the heat in the control panel and the heat from each motor (pattern). The two patterns of 2) were compared. As a result, in the pattern 2 apparatus configured to recover heat, the purge inlet temperature increased by 3 ° C. or more and the temperature of the gas passing through the regeneration blower increased by 2 ° C. or more as compared with the pattern 1 apparatus. As a result, the concentration of carbon dioxide on the regeneration outlet side in pattern 2 increased by 50 ppm as compared with pattern 1. In addition, the running cost required to recover carbon dioxide per kg was reduced by 10% in the case of pattern 2 as compared with pattern 1.

Regarding the air intake port of the control panel in this experiment, an opening with a dust filter attached was provided at the bottom of the door of the control panel facing the outside of the device, and for the air outlet, the control panel facing the inside of the device. It was provided at the top of the mounting part. However, the present invention is not limited to the above-mentioned position of the control panel, and the air intake port may be provided on the side surface of the lower part of the control panel, or the air intake port may be provided on the ceiling of the control panel. In short, it should be configured so that the maximum amount of heat generated can be recovered depending on the arrangement of equipment in the control panel and the flow of air. Further, when the device is installed outdoors, a louver, a louver, or the like may be attached in order to prevent rainwater from entering the control panel.

According to the present invention, in a gas removal concentrator using an adsorption honeycomb rotor carrying an adsorbent that can be regenerated at a low temperature, instead of raising the temperature and regenerating by means of regenerating gas heating such as a normal regenerating heater, only a regenerating blower is used. Since it is heated by raising the temperature of the above, it is possible to reduce the heating energy required for desorption of the adsorbed target substance, which is energy saving and can reduce the running cost. In addition, since a regeneration heater and a heat exchanger are not required, the entire device can be miniaturized, which leads to a reduction in initial cost.

1 Adsorption Honeycomb Rotor 2 Processing Zone 3 Regeneration Zone 4 Purge Zone 5 Processing Blower 6 Regeneration Blower 7 Pre-Purge Zone

Claims

It has an adsorption honeycomb rotor carrying an adsorbent that can be regenerated at low temperature, divides the adsorption honeycomb rotor into at least a treatment zone and a regeneration zone, ventilates the treatment target gas through the treatment zone, and adsorbs the target substance to the honeycomb. It is a gas removal and concentrating device that desorbs the target substance adsorbed by the honeycomb by removing it and ventilating the regeneration gas through the regeneration zone, and is characterized in that the regeneration blower is arranged on the regeneration inlet side. Gas removal concentrator.
The gas removing and concentrating device according to claim 1, wherein the adsorption honeycomb rotor is provided with a purge zone after the regeneration zone.
The gas removing and concentrating device according to claim 1, wherein the adsorption honeycomb rotor is provided with a pre-purge zone before the regeneration zone and a purge zone after the regeneration zone.
The gas removing and concentrating device according to claim 3, wherein in the adsorption honeycomb rotor, a part of the outlet gas of the regeneration zone is introduced into the inlet of the pre-purge zone.
The gas removing and concentrating device according to claim 3 or 4, wherein the air volume of the outlet gas of the purge zone and / or the outlet gas of the pre-purge zone is controlled by an air volume adjusting device. apparatus.
In the gas removal and concentrating device according to any one of claims 1 to 5, the control panel is provided with an air intake port and an air outlet, and the regeneration zone inlet, the purge zone inlet, and the above from the air outlet. A gas removal concentrator characterized by providing a pipe that passes through at least one of the purge zone outlets.
The gas removing and concentrating device according to claim 6, wherein the pipe is passed through the vicinity of the motor of the processing blower and / or the regenerating blower.