TWI813857B - Gas Removal and Concentration Unit - Google Patents

Abstract

The present invention provides an energy-saving gas removal and concentration device that does not require a heating mechanism for regeneration of an adsorption honeycomb rotor. In a gas removal and concentration device using an adsorption honeycomb rotor carrying an adsorption material that can be regenerated at low temperature, a blower is used as a heating mechanism to increase the temperature of the regeneration gas, thereby eliminating the need for heating such as a regeneration heater or a hot water coil. mechanism, so it can reduce the heating energy required for regeneration, save energy and reduce operating costs.

Description

Gas removal and concentration device

The present invention relates to a gas removal and concentration device, which is characterized by using an adsorption honeycomb rotor carrying a low-temperature regenerable adsorption material in order to remove or concentrate a target substance from a treatment target gas composed of various gas components. Adsorption and desorption are performed by a temperature difference. When low-temperature regeneration is possible in this gas removal and concentration device, heating is performed by simply raising the temperature of a regeneration blower for blowing out the regeneration gas instead of the usual use of a regeneration heater. The gas heating mechanism is regenerated, thus saving energy used for heating and achieving energy savings.

Conventionally, as an apparatus capable of separating and removing gaseous removal target substances from air to be processed in a concentrated state at low temperature, for example, an absorption-type removal/concentration apparatus shown in Patent Document 1 is known, which uses a retaining amine absorbent. It uses a breathable adsorption honeycomb rotor and uses the enthalpy difference between the air to be processed and the air for regeneration to separate target substances, thereby ensuring the material recovery rate of the device while suppressing regeneration energy. In addition, by regenerating at low temperatures, oxidative deterioration and odor problems of the amine absorbent can be reduced.

Regarding low-temperature regeneration, Patent Document 2 discloses a low-temperature regeneration drying dehumidifier. In the aforementioned low-temperature regeneration drying dehumidifier, a drying rotor loaded with adsorbent materials such as polymer adsorbents is used. In the cooling mode, the return air energy can be used as regeneration energy to regenerate the drying rotor. Therefore, there is no need to regenerate the front section of the inlet during basic operation. The heating source is a warm water coil, which is energy-saving. In the cooling mode, when the dehumidification capability of the cold and hot water coils in front of the treatment inlet is insufficient, the hot water coil in front of the regeneration inlet functions as a return air preheating section for heating the return air used for regeneration, thereby regenerating Drying rotor to ensure dehumidification capability. On the other hand, in the heating mode, the processing side and the regeneration side of the drying rotor in the cooling mode are switched, the outside air is heated by passing the hot water coil, and the humidified air is supplied to the room. [Prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2017-154063 [Patent Document 2] Japanese Patent No. 5669587

Among those disclosed in Patent Document 1, examples of the temperature adjustment mechanism for heating the regeneration air include a cooling coil, a heating coil, a Peltier element, an electric heater, a steam heater, or a condenser of a heat pump. ), evaporator, etc., although they are low-temperature regeneration, they require energy for heating.

Among those described in Patent Document 2, a hot water coil as a regeneration air heating mechanism is basically unnecessary in the cooling mode. However, when the dehumidification capability of the cold hot water coil in front of the process inlet is insufficient or heating is required, The mechanism requires a warm water coil and a heating mechanism.

In view of this fact, the main subject of the present invention is to provide a gas removal and concentration device that uses an adsorption honeycomb rotor carrying an adsorption material that can be regenerated at low temperature. In this gas removal and concentration device, when low temperature regeneration is possible, as a regeneration device The heating mechanism that raises the temperature of the gas uses a blower-based heating mechanism. This eliminates the need for heating mechanisms such as regenerative heaters or hot water coils, and can reduce regeneration energy and operating costs. In addition, in the present invention, "low-temperature regeneration" means regeneration with a regeneration gas at a temperature of 50° C. or lower (hereinafter, temperatures are all referred to as "Celsius").

In order to solve the above problems, the present invention provides a gas removal and concentration device, which has an adsorption honeycomb rotor. The adsorption honeycomb rotor is divided into at least a treatment area and a regeneration area, and the treatment target gas is ventilated into the treatment area, thereby treating the process. The target substance contained in the target gas is adsorbed to the honeycomb and separated and removed from the treatment target gas. In the regeneration area, the regeneration gas is ventilated, whereby the target substance adsorbed by the honeycomb in the aforementioned treatment area is desorbed by the regeneration gas. The adsorbent loaded on the rotor portion that is concentrated and regenerated is heated only by temperature rise by the regeneration blower instead of using a regeneration heater or the like as a regeneration heating mechanism. Therefore, energy for heating is not required and energy saving can be achieved. . [Effects of the invention]

The gas removal and concentration device of the present invention is configured as described above. It ventilates the gas to be processed into the processing area, thereby adsorbing the target substance contained in the gas to be processed to the honeycomb, and separating and removing it from the gas to be processed. In the regeneration area , the regeneration gas is ventilated, thereby desorbing the target substances adsorbed by the honeycomb in the aforementioned treatment area into the regeneration air and concentrating it, and regenerating the loaded adsorption material in the rotor part. In the regeneration of this honeycomb, when low-temperature regeneration is possible, there is no need for a heating mechanism such as a regeneration heater, and heating is performed only by raising the temperature by a regeneration blower. Therefore, energy for heating is not required, and energy saving can be achieved. Reduce operating costs.

For example, in the gas removal and concentration device of the present invention, even if an amine-based absorbent that is prone to performance degradation due to temperature is used as a low-temperature regenerable adsorbent, oxidative deterioration and odor of the absorbent can be suppressed. In addition, it can be operated easily even in an environment without facilities such as a heat pump or warm water. In addition, since a regeneration heater or a heat exchanger is not required, the entire device can be miniaturized, thereby reducing initial costs.

In the present invention, there is an adsorption honeycomb rotor carrying an adsorption material that can be regenerated at low temperature, and the adsorption honeycomb rotor is divided into at least a treatment area and a regeneration area. The gas to be processed is ventilated into the treatment area, the target substance is separated and removed from the gas to be processed, the regeneration gas heated by the regeneration blower is ventilated into the regeneration area, and the adsorbed target substance is desorbed. [Example 1]

Hereinafter, Embodiment 1 of the gas removal and concentration device of the present invention will be described in detail with reference to FIG. 1 . 1. To absorb the honeycomb rotor, flame-retardant sheets such as ceramic fiber paper or glass fiber paper are corrugated (with corrugated paper) and rolled into a rotor shape, and can be loaded at temperatures below 50°C. Low-temperature regenerated adsorbent materials, such as amine-based solid absorbents. The adsorption honeycomb rotor 1 is divided into a processing area 2, a regeneration area 3, and a purge area 4. The adsorption honeycomb rotor 1 rotates in this order to continuously remove the concentrated target substance from the gas to be processed.

The gas to be processed is ventilated into the processing area 2, and target substances such as carbon dioxide contained in the gas to be processed are adsorbed to the honeycomb and separated and removed from the gas to be processed, thereby reducing the concentration of the target substance, and then supplied to the gas through the blower 5 for processing. position for supply or discharge. A part of the gas supplied to the processing area is branched and ventilated to the purge area 4, thereby increasing the temperature of the gas. In addition, the gas passing through the purge area 4 passes through the regeneration blower 6, and the heated regeneration gas is ventilated to the regeneration area 3, and the target substances adsorbed on the honeycomb are desorbed into the regeneration gas, and the target substances containing the concentrated target substances are desorbed. Gas is supplied or discharged to the supply site.

As described in Patent Document 2, not only the dehumidification device but also the device using an adsorption honeycomb rotor is generally equipped with a blower on the regeneration outlet side. This is because arranging a regeneration heater as a heating mechanism on the side of the regeneration inlet is also one of the reasons. However, when the processing outlet gas is supplied to the supply part for removal purposes, the regeneration inlet/regeneration outlet is relatively different from the processing inlet/processing outlet. When the pressure becomes negative, the leakage amount of the desorbed target substance from the regeneration side to the treatment side is reduced, so the removal efficiency of the target substance in the treatment outlet side becomes good.

On the other hand, the regeneration blower 6 according to Embodiment 1 of the present invention is arranged on the regeneration inlet side. When the regeneration outlet gas is supplied to the supply site for concentration purposes, the process inlet/process outlet becomes a negative pressure relative to the regeneration inlet/regeneration outlet, and the gas leaks from the process side to the process side where the target substance concentration is low on the regeneration side. The amount is reduced, thus improving the concentration performance. However, in removal applications, the treatment outlet gas in which the target substance has been removed is supplied to the supply site, so leakage occurs from the regeneration inlet side to the treatment outlet side, and the removal efficiency may deteriorate. Therefore, a purge area 4 is provided behind the regeneration area 3 along the rotor rotation direction to reduce leakage between the processing side/regeneration side.

If the wind passing through the blower is directly ventilated into the duct, wind noise may be generated due to drift. In building air conditioning, wind noise becomes a cause of noise and potentially a fatal problem. In Example 1, since the regeneration gas that has passed through the regeneration blower 6 is ventilated to the adsorption honeycomb rotor 1 on the regeneration side, rectification is performed and wind noise is reduced by the sound absorption effect of the adsorption honeycomb rotor 1 . Therefore, it is possible to reduce noise and vibration when installing the gas removal and concentration device of the present invention indoors, and to install the device in an equipment room or the like.

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

In buildings in subtropical areas such as Thailand and Singapore, warm water is rarely supplied. In order to obtain regenerated heating gas, heating by an electric heater, heat rejection by a heat pump, or heat rejection by a refrigerator is required. In the gas removal and concentration device of the present invention, these are not required and the regeneration inlet temperature can be solved simply by raising the temperature by the blower. Therefore, it can be particularly effective in subtropical areas where warm water cannot be expected.

In the present invention, the adsorbent material is required to have the ability to desorb the target substance even at low temperatures such as 50° C. or lower. When the target substance is carbon dioxide, for example, using an amine-carrying solid absorbent as the adsorbent material has the effect of reducing thermal degradation and extending the life of the adsorption honeycomb rotor by regenerating it at low temperatures. In addition, it is also possible to suppress odors generated from the adsorbed honeycomb rotor such as amine odor due to decomposition of amines.

The present invention is not limited to the flowchart of FIG. 1 , and may be configured as follows: part of the processing outlet gas passing through the processing area 2 or external air, return air from the room, etc. is introduced into the purge area 4 . In addition, it may be configured to circulate on either or both of the processing side and the regeneration side.

Moreover, a precooler, an aftercooler, a humidity adjustment mechanism, etc. may be provided as needed, or a process blower 5 may be provided on the process inlet side. In addition, the blowers other than the regeneration blower 6 may be arranged at appropriate positions as necessary and may be added.

In addition, the purge area may be deleted and only the processing area and the regeneration area may be provided. In this case, leakage from the regeneration side to the treatment side becomes a problem. However, for example, when the target substance is carbon dioxide, the carbon dioxide concentration of the outside air is low, about 450 ppm. Therefore, even if the outside air leaks to the treatment outlet side, The carbon dioxide concentration only increases by about a few tens of ppm. Weigh the purge area setting and initial cost to make a proposal that meets the requirements. [Example 2]

In the process of Embodiment 2 of the present invention in Figure 2, the difference from Embodiment 1 is that there is a pre-purge area 7. As mentioned above, the pre-purge area 7 is provided in front of the regeneration area 3 and the purge area 4 is provided in the back of the regeneration area 3, thereby further reducing leakage.

The flow of gas in Figure 2 is basically the same as that in Figure 1. The gas passing through the purge area 4 and the gas passing through the pre-purge area 7 are mixed, heated by the regeneration blower 6, and ventilated to the regeneration area 3.

In addition, the present invention is not limited to the flow shown in FIG. 2 , and may be configured to introduce part of the process outlet gas passing through the process area 2 , external air, or return air from the room into the purge area 4 . Similarly, not only external air is introduced into the pre-purge area 7, but also return air from the room, part of the gas introduced into the treatment area, part of the treatment outlet gas passing through the treatment area, etc. can be introduced into the pre-purge area. Area 7. The gas may be circulated between the purge area 4 and the pre-purge area 7 . In addition, it may be configured to circulate on either or both of the processing side and the regeneration side.

Moreover, a precooler, an aftercooler, a humidity adjustment mechanism, etc. may be provided as needed. In addition, blowers other than the regeneration blower 6 may be arranged at appropriate positions as needed and may be added. [Example 3]

In the process of Embodiment 3 of the present invention in FIG. 3 , the difference from Embodiment 2 is that part of the regeneration outlet gas is introduced into the pre-purge area 7 . When concentrating a target substance, a part of the outlet gas is recycled and regenerated, thereby further increasing the concentration.

Regarding the regeneration outlet chamber of the chamber (not shown) of the mechanism that divides the areas, if the partition plate in the area between the pre-purge inlet and the regeneration outlet is deleted, the regeneration outlet gas can be directly used in the chamber. A portion is returned to the pre-purge inlet, and the cost of the chamber is reduced. In addition, the structure is not limited to this form, and a part of the gas passing through the regeneration outlet chamber may be introduced into the pre-purge inlet through a conduit from outside the chamber.

The present invention is not limited to the flowchart of FIG. 3 , and may be configured as follows: a part of the processing outlet gas passing through the processing area 2 or external air, return air from the room, etc. is introduced into the purge area 4 .

Moreover, a precooler, an aftercooler, a humidity adjustment mechanism, etc. may be provided as needed. In addition, the blowers other than the regeneration blower 6 may be arranged at appropriate positions as necessary and may be added. In addition, it may also be configured to circulate on the processing side.

In addition, it may be configured such that it can be installed in any or both of the pipes that transport gas from the outlet of the purge area 4 and the outlet of the pre-purge area 7 in FIGS. 2 and 3 to the blower 6 for regeneration. Air volume adjustment devices such as dampers or valves are used to control the air volume and control the target substance removal performance on the treatment outlet side or the target substance concentration performance on the regeneration outlet side.

In a common dehumidification device or a device according to the present invention, a control panel is often installed in an integrated manner. Generally, the temperature inside the control panel may rise due to the heat generated by internal devices, etc., which may cause the control panel to malfunction. Therefore, a small cooling fan or the like is provided. It can also be configured as follows: in order to recover the heat of this temperature increase, an air inlet is provided on the control panel, an air outlet is provided on the opposite side, and a connection between the air outlet and the purge inlet or outlet is provided. Piping. In addition, for example, the pipe may be passed near the motor of each blower to recover the heat released from each motor to the outside. In addition, when the purge area is not provided at the air outlet, a pipe connected to the inlet of the regeneration area may be provided.

In the process shown in Figure 1, a carbon dioxide removal and concentration experiment was conducted using a gas removal and concentration device equipped with an adsorption honeycomb rotor with a diameter of ψ200mm and a thickness of 200mm. The concentration of carbon dioxide supplied to the treatment inlet side and the purge inlet side is set to about 500 ppm based on atmospheric conditions. In the device, two modes were compared between the case where the equipment constituting the flow of Figure 1 is used (Mode 1) and the case where the following configuration is used (Mode 2). In Mode 2, in addition to the equipment in Mode 1, there are also The control panel is provided with an air inlet, and an air outlet is provided on the opposite side of the control panel. A pipe is connected from the air outlet to the purge inlet, and the pipe is passed near the motors of the treatment blower and the regeneration blower to control recovery. The heat in the plate and the heat from each motor. As a result, compared with the device in Mode 1, the purge inlet temperature of the device in Mode 2 configured to recover heat increased by more than 3°C, and the temperature of the gas passing through the regeneration blower increased by more than 2°C. As a result, the concentration of carbon dioxide on the regeneration outlet side in Mode 2 increases by 50 ppm compared with Mode 1. In addition, compared with Mode 1, in the case of Mode 2, the operating cost required to recover 1 kg of carbon dioxide is reduced by 10%.

In addition, as for the air inlet of the control panel in this experiment, an opening with a dust filter installed is provided at the lower part of the door of the control panel facing the outside of the device, and as for the air outlet, it is provided at the upper part of the installation part of the control panel facing the inside of the device. . However, the present invention is not limited to the above-mentioned position of the control panel. The air inlet may be provided on the side of the lower part of the control panel, or the air outlet may be provided on the top of the control panel. The key is to configure it so that the heat generated can be recovered to the maximum extent by the arrangement of the equipment in the control panel, the flow of air, etc. In addition, when the device is installed outdoors, in order to prevent rainwater from entering the control panel, a shutter or a transom may be installed. [Industrial availability]

In the present invention, in a gas removal and concentration device using an adsorption honeycomb rotor carrying an adsorption material that can be regenerated at low temperature, heating is performed only by the temperature increase of the regeneration blower instead of the usual temperature increase by a regeneration gas heating mechanism such as a regeneration heater. And regeneration is performed, so the heating energy required for desorption of the adsorbed target substance can be reduced, saving energy and reducing operating costs. In addition, since a regeneration heater or a heat exchanger is not required, the entire apparatus can be downsized, thereby also reducing the initial cost.

1: Adsorption honeycomb rotor 2: Processing area 3: Regeneration area 4:Purge area 5:Blower for treatment 6: Blower for regeneration 7: Pre-purge area

Figure 1 is a flow chart in Embodiment 1 of the gas removal and concentration device of the present invention. Figure 2 is a flow chart in Embodiment 2 of the gas removal and concentration device of the present invention. Figure 3 is a flow chart in Embodiment 3 of the gas removal and concentration device of the present invention.

1: Adsorption honeycomb rotor

2: Processing area

3: Regeneration area

4:Purge area

5:Blower for treatment

6: Blower for regeneration

Claims (7)

A gas removal and concentration device, which has an adsorption honeycomb rotor carrying low-temperature regenerable adsorption material. The adsorption honeycomb rotor is divided into at least a treatment area and a regeneration area. The treatment target gas is ventilated into the treatment area and the target substance is adsorbed. to the honeycomb and remove it, and ventilate the regeneration gas into the regeneration area to desorb the target substance adsorbed by the honeycomb. The characteristic is that a regeneration blower is arranged on the regeneration inlet side, and in the gas removal and concentration device, Does not have heating mechanism. The gas removal and concentration device as claimed in claim 1, wherein a purge area is provided behind the regeneration area in the adsorption honeycomb rotor. The gas removal and concentration device as claimed in claim 1, wherein in the adsorption honeycomb rotor, a pre-purge area is provided in front of the regeneration area, and a purge area is provided behind the regeneration area. The gas removal and concentration device as claimed in claim 3, wherein in the adsorption honeycomb rotor, a part of the outlet gas of the regeneration area is introduced into the inlet of the pre-purge area. The gas removal and concentration device as claimed in claim 3, wherein the air volume adjusting device is used to control the air volume of the outlet gas of the purge area and/or the outlet gas of the pre-purge area. The gas removal and concentration device as described in claim 2, wherein a control panel is provided with an air inlet and an air outlet, and is provided with a gas outlet leading from the air outlet to the regeneration area inlet, the purge area inlet, and the purge area outlet. At least one or more pipes. The gas removal and concentration device according to claim 6, wherein the pipe passes near the motor of the treatment blower and/or the regeneration blower.

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