JP4014393B2 - Dehumidifier - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adsorption-type dehumidifying device, and more specifically, dehumidifies air by ventilating the dehumidifying adsorbent layer, and applies the dehumidifying adsorbent layer used for the air dehumidification to the dehumidifying adsorbent layer. The present invention relates to a dehumidifying device that is configured to be regenerated by ventilation of a high-temperature gas for regeneration and used again for the air dehumidification.
[0002]
[Prior art]
When a burner is used as a heat source device for regeneration in this type of dehumidifier, if the combustion gas of the burner is directly ventilated as a regeneration high-temperature gas through the dehumidifying adsorbent layer, the odor contained in the fuel supplied to the burner Impurity oxides (especially sulfur oxides) such as components cause deterioration of the dehumidifying adsorbent layer, and also cause deterioration of various equipment components around the dehumidifying adsorbent layer. High-temperature air or steam is generated by a heat exchanger using the combustion gas as a heat source, and these high-temperature air or steam is passed as a regeneration high-temperature gas to the dehumidifying adsorbent layer.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional apparatus, necessary regeneration is caused by heat loss due to heat exchange in a heat exchanger that generates high-temperature air or steam by using combustion gas as a heat source and heat loss due to the heat capacity of the heat exchanger. There is a problem that the amount of combustion required to obtain the amount of heat for use increases and the operating cost of the apparatus increases, and the equipment becomes larger and the apparatus cost increases due to the installation of the heat exchanger. .
[0004]
In view of this situation, the main problem of the present invention is to effectively solve the above problem while preventing the deterioration of the adsorbent layer and the like by using a burner in the heat source device for regeneration.
[0005]
[Means for Solving the Problems]
[1] The invention according to claim 1 relates to a dehumidifying device, the feature of which is
The air is dehumidified by ventilating the dehumidifying adsorbent layer, and the dehumidifying adsorbent layer used for the air dehumidification is regenerated by ventilating the regeneration high-temperature gas to the dehumidifying adsorbent layer, and the air is reused. A dehumidifying device configured to be used for dehumidification,
In the rotation path of the adsorption rotor on which the dehumidifying adsorbent layer is arranged, a processing area for dehumidifying the air and a regeneration area for regenerating the dehumidifying adsorbent layer are arranged side by side in the rotor rotation direction,
In the regeneration zone, the combustion gas of the burner is vented to the dehumidifying adsorbent layer as the regeneration high-temperature gas,
The combustion gas path that guides the combustion gas to the regeneration zone is provided with a regeneration side damper that maintains the processing zone at a positive pressure with respect to the regeneration zone by adjusting the damper opening, and from the fuel supplied to the burner A fuel purifying means is provided for removing an impure component that causes deterioration of the dehumidifying adsorbent layer.
[0006]
In other words, in this configuration, air is dehumidified by ventilation to the dehumidifying adsorbent layer, and the dehumidifying adsorbent layer used for this air dehumidification is regenerated by ventilating the regeneration high-temperature gas to the dehumidifying adsorbent layer. In order to re-use the air for dehumidification, the regeneration area for dehumidifying the adsorbent layer and the processing area for dehumidifying the air are regenerated on the rotation path of the adsorption rotor provided with the dehumidifying adsorbent layer. In the regeneration zone, the burner combustion gas is passed through the dehumidifying adsorbent layer as the regeneration high-temperature gas. In this configuration, as described above, Since the treatment area is maintained at a positive pressure with respect to the regeneration area, gas leakage from the regeneration area to the treatment area (that is, leakage of burner combustion gas as a regeneration high-temperature gas from the regeneration area to the treatment area) is prevented. Can be prevented.
In addition, since the fuel from which the impure components that cause the deterioration of the dehumidifying adsorbent layer are removed by the fuel purifying means is supplied to the burner and burned, the combustion gas is an impure component oxide that deteriorates the dehumidifying adsorbent layer. Concentration is effectively reduced, which makes it possible to effectively deteriorate the dehumidifying adsorbent layer while adopting a configuration in which the combustion gas is directly passed through the dehumidifying adsorbent layer as a high-temperature gas for regeneration. In addition, various apparatus components around the dehumidifying adsorbent layer (for example, rotor components other than the dehumidifying adsorbent layer in embodiments described later, such as rotor components such as honeycomb materials) may also deteriorate. It can be effectively prevented.
[0007]
In addition, by adopting a configuration in which the combustion gas of the burner is directly ventilated to the dehumidifying adsorbent layer as a regeneration high-temperature gas while preventing the deterioration of the dehumidifying adsorbent layer and the like as in the above-described conventional apparatus. A heat exchanger for a combustion gas heat source (a heat exchanger for a combustion gas heat source that heats and generates high-temperature air or steam used as a high-temperature gas for regeneration) can be eliminated, and the heat associated with the heat exchange in that heat exchanger The amount of heat generated by the burner can be used efficiently for regeneration while avoiding loss and heat loss due to the heat capacity of the heat exchanger, and as a result, combustion required to obtain the necessary amount of heat for regeneration compared to conventional devices The amount can be effectively reduced, and the operating cost of the apparatus can be reduced.
[0008]
Further, since the heat exchanger for the combustion gas heat source is not required, the apparatus can be downsized and the apparatus cost can be reduced as compared with the conventional apparatus.
[0009]
In the embodiment of the invention according to claim 1, the fuel supplied to the burner may be any of gas fuel, liquid fuel, and solid fuel.
[0010]
In addition, the fuel purifying means may be any type of removal method such as a method of removing impure components contained in fuel by adsorption or absorption, or a method of removing impurities by chemically separating or reforming them. Any suitable removal method may be selected according to the type of fuel used and the impurity component to be removed.
[0011]
[2] The invention according to claim 2 specifies a preferred embodiment for carrying out the invention according to claim 1, and its features are as follows:
An air-permeable fuel adsorbent layer that removes odorous components of the gas fuel by adsorption is provided in the gas fuel supply path to the burner as the fuel purification means.
[0012]
In other words, the odorous component of the gas fuel is often a cause of deterioration of the dehumidifying adsorbent layer (for example, mercaptans and sulfides), whereas in the above configuration of the invention according to claim 2, the gas fuel is burned. The odorous component in the gas fuel is removed by ventilating the fuel adsorbent layer in the process of feeding to the fuel, and as a result, the odorous component in the combustion gas ventilated to the dehumidifying adsorbent layer as a high-temperature regeneration gas By reducing the oxide concentration, the dehumidifying adsorbent layer is prevented from deteriorating, and the deterioration of various device components around the dehumidifying adsorbent layer is also prevented.
[0013]
Therefore, according to the invention which concerns on Claim 2, it can be set as the apparatus suitable when using odor gas fuels, such as city gas (a natural gas is included) and propane gas which a gas company sells.
[0014]
In the implementation of the invention according to claim 2, the fuel adsorbent layer may have any structure such as a packed bed structure, a net structure, or a honeycomb structure.
[0015]
In addition, as the adsorbent constituting the fuel adsorbent layer, various substances can be used as long as they can adsorb odorous components of gas fuel, such as activated carbon, silica gel, zeolite or various catalysts. An appropriate adsorbent may be selected according to the odor component to be removed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, reference numeral 1 denotes a dry room as a low humidity target area for manufacturing an article that dislikes the presence of moisture in the air (for example, electronic parts, drugs, films, etc.). The extremely low humidity air SA (for example, air having a dew point temperature of −35 ° C.) generated by the dehumidifying device 2 is supplied, and the dry room 1 is maintained in a required low humidity atmosphere by supplying the low humidity air SA.
[0017]
The adsorption rotor 3 of the dehumidifying device 2 is one in which a honeycomb-structured breathable dehumidifying adsorbent layer X using an adsorbent such as silica gel, zeolite, activated carbon or the like is continuously arranged in the rotor rotation direction as a rotor constituent material. In this embodiment, as shown in FIG. 2, a disk-like adsorption rotor 3 that allows gas to pass in the direction of the rotor rotation axis P is used.
[0018]
Further, the rotation path of the adsorption rotor 3 is divided into four regions of a pretreatment region 4, a regeneration region 5, a purge region 6, and a main treatment region 7 in the rotor rotation direction, and these four regions 4 to 7 are described above. By arranging them in order in the rotor rotation direction, each part of the rotor is shifted in the order of the preprocessing area 4, the regeneration area 5, the purge area 6, and the main processing area 7 as the suction rotor 3 rotates.
[0019]
Reference numeral 8 denotes an outside air introduction path for introducing outside air OA from the outside. The outside air introduction path 8 has a filter 9A for purifying the introduced outside air OA (for example, air having a dry bulb temperature of 34 ° C. and an absolute humidity of 22.1 g / kgDA). And a precooler 9B for precooling the outside air OA purified by the filter 9A. 9C is an eliminator equipped on the precooler 9B.
[0020]
In the pretreatment area 4, the introduced outside air OA purified and precooled by the filter 9A and the precooler 9B is passed through the dehumidifying adsorbent layer X of the rotor part in the area passage process as air to be treated. The outside air OA is dehumidified (pre-dehumidified) by moisture adsorption by the dehumidifying adsorbent layer X.
[0021]
Further, in the main processing area 7, the dehumidifying adsorbent layer X (that is, the preprocessing) of the rotor portion in the process of passing the pre-dehumidified outside air OA ′ guided from the preprocessing area 4 through the inter-area air duct 10. The adsorbent layer having a high adsorption capacity before use in the area 4 is ventilated in the direction opposite to the direction of the outside air OA in the pretreatment area 4 so that the outside air OA ′ after the prehumidification is similarly dehumidified. The moisture is adsorbed by the adsorbent layer X for further dehumidification to the required humidity (main dehumidification), and the outside air OA ″ after the main dehumidification is cooled by the aftercooler 11 and then generated as the low-humidity air SA through the air supply path 12 in the dry room 1 To supply.
[0022]
On the other hand, 13 is a regeneration-side outside air introduction path for introducing outside air OA through the filter 13A, and 14 is a regeneration burner for burning the gaseous fuel G using the introduced outside air OA from the regeneration-side outside air introduction path 13 as combustion air, In the regeneration zone 5, the combustion gas HA produced by the regeneration burner 14 is used as a regeneration high-temperature gas, and the dehumidifying adsorbent layer X in the rotor portion in the process of passing through the zone (that is, after being used for main dehumidification and pre-dehumidification) The adsorbed water in the main processing area 7 and the preprocessing area 4 is desorbed from the dehumidifying adsorbent layer X by ventilating the adsorbent layer) in the direction opposite to the direction of the outside air OA in the preprocessing area 4. Then, the dehumidifying adsorbent layer X is regenerated.
[0023]
Further, in the purge zone 6, the dehumidifying adsorbent for the rotor portion that is in the process of passing through the zone using a part of the pre-dehumidified outside air OA ′ branched from the inter-zone air duct 10 to the purge branch channel 16 as the purge gas PA. By scavenging the layer X in the same direction as that of the outside air OA ′ in the main processing area 7, the scavenging (purge) of the combustion gas HA remaining in the dehumidifying adsorbent layer X and the dehumidifying adsorption The agent layer X is cooled, and after the scavenging / cooling process in the purge region 6, the dehumidifying adsorbent layer X after the regeneration in the regeneration region 5 is moved to the main treatment region 7 and the subsequent pretreatment region as the rotor 3 rotates. Shift to the processing area 4 again.
[0024]
The fuel supply passage 14a to the regeneration burner 14 is provided with a breathable fuel adsorbent layer 15 that removes odorous components of the gas fuel G supplied to the regeneration burner 14 by adsorption as fuel purification means. By removing this odorous component, the concentration of the odorous component oxide (especially sulfur oxide) in the combustion gas HA flowing through the dehumidifying adsorbent layer X as a high-temperature gas for regeneration is reduced, and the odor The deterioration of the dehumidifying adsorbent layer X due to the component oxides and the deterioration of various device components around the dehumidifying adsorbent layer X (rotor material and honeycomb material other than the adsorbent layer X) are prevented.
[0025]
As shown in FIG. 3, the fuel adsorbent layer 15 has a packed bed structure in which a gas-permeable container 15a is filled with a granular or fibrous adsorbent 15b (for example, activated carbon, silica gel, zeolite, etc.). The container 15a filled with the agent 15b has a cartridge structure that is detachably attached to a storage portion 14b provided in the middle of the fuel supply path 14a.
[0026]
Reference numeral 17 denotes an exhaust passage for discharging the used combustion gas HA ′ sent from the regeneration zone 5 to the outside. Reference numeral 18 denotes a part of the used combustion gas HA ′ from the exhaust passage 17, and the divided gas HA ″. Is an exhaust-side heat recovery mixing path that mixes with the introduced outside air OA of the regeneration-side outside air introduction path 13, and 19 is a regeneration-side outside air introduction path for the used purge gas PA ′ delivered from the purge zone 6. 13 is a purge-side heat recovery mixing path for mixing with the 13 introduced outside air OA.
[0027]
Reference numeral 20 denotes a processing-side fan interposed in the inter-area air guide passage 10 upstream from the branching point of the purge branching passage 16. The processing-side fan 20 introduces and preliminarily introduces the outside air OA through the outside air introduction passage 8. Ventilation of the outside air OA and OA ′ to the dehumidifying adsorbent layer X in each of the processing area 4 and the main processing area 7 and ventilation of the purge gas PA to the dehumidifying adsorbent layer X in the purge area 6 are performed.
[0028]
Reference numeral 21 denotes a regeneration-side fan interposed in the exhaust passage 17 upstream from the branching point of the exhaust-side heat recovery mixing passage 18, and the dehumidifying adsorbent layer in the regeneration region 5 by the regeneration-side fan 21. Ventilate the combustion gas HA to X.
[0029]
Reference numeral 22 denotes a purge-side damper interposed in the purge branch flow path 16. As described above, the process-side fan 20 is passed through the dehumidifying adsorbent layer X in the main processing area 7 by the outside air OA ′ and dehumidified in the purge area 6. The main processing area 7 is kept at a positive pressure with respect to the adjacent purge area 6 by adjusting the opening degree of the purge side damper 22 in contrast to the ventilation of the purge gas PA to the adsorbent layer X. This reliably prevents gas leakage from the purge area 6 to the main processing area 7 which causes a decrease in dehumidification performance.
[0030]
In addition, the main process area 7 is maintained at a positive pressure with respect to the opposite pre-process area 4 by adopting a format in which the process-side fan 20 is interposed in the inter-area air guide path 10. Gas leakage from the pre-processing area 4 to the main processing area 7 that causes a decrease in the temperature is reliably prevented.
[0031]
Reference numeral 23 denotes a regeneration side damper that is interposed in a combustion gas passage 24 that guides the combustion gas HA of the regeneration burner 14 to the regeneration zone 5, and has a type in which the processing side fan 20 is interposed in the inter-zone air duct 10 as described above. On the other hand, by adjusting the opening of the regeneration-side damper 23 (that is, the damper opening) , the pretreatment area 4 is kept at a positive pressure with respect to the adjacent regeneration area 5, so that the dehumidifying performance can be maintained. Gas leakage from the regeneration zone 5 to the pretreatment zone 4 that causes a decrease is also reliably prevented.
[0032]
[Another embodiment]
Next, another embodiment will be listed.
[0033]
In the above-described embodiment, an example of the all-outside air method in which 100% outside air is passed through the dehumidifying adsorbent layer X in the preprocessing area 4 is shown, but the processing target air in the preprocessing area 4 is limited to 100% outside air. Air that is mixed with a part of the exhaust air from the dry room 1, a part of the air OA ″ after the main dehumidification, or a part of the air OA ′ after the pre-dehumidification is mixed with the outside air OA introduced from the outside. Pre-dehumidification may be performed in the pre-processing area 4.
[0034]
As for the main dehumidification in the main treatment area 7, only the air OA ′ after the pre-dehumidification is replaced with the main dehumidification in the main treatment area 7 as in the above-described embodiment, and the air is removed from the air OA ′ after the pre-dehumidification. You may make it main dehumidify in the main process area 7 the air which mixed a part of exhaust air from the room 1, and a part of air OA "after the main dehumidification.
[0035]
In the above-described embodiment, the example in which the air OA to be dehumidified is dehumidified in two stages in the pre-processing area 4 and the main processing area 7 has been described, but the number of dehumidifying stages for the dehumidifying target air OA may be one stage, There may be three or more stages.
[0036]
The adsorption rotor 3 provided with the dehumidifying adsorbent layer X is not limited to a disk-shaped rotor that allows gas to pass in the direction of the rotor rotation axis P, but may be a cylindrical rotor that allows gas to pass in the rotational radius direction. Moreover, an endless belt-like rotor that allows gas to pass in a direction orthogonal to the belt surface may be used.
[0037]
In the above-described embodiment, the dehumidifying adsorbent layer X is alternately moved over the processing areas 4 and 7 for dehumidifying the air OA and OA ′ and the regeneration area 5 for performing the regeneration process. The present invention can also be applied to a dehumidifier of a type in which the ventilation air to the fixed dehumidifying adsorbent layer X is alternately switched between the dehumidification target air OA and the combustion gas HA as a high-temperature regeneration gas.
[0038]
The purge gas PA is not limited to a part of the pre-dehumidified air OA ′, but a part of the air OA ″ after the main dehumidification and other gases, such as a scavenging / cooling process for the dehumidifying adsorbent layer X after the regeneration. Any gas may be used as long as it can be performed.
[0039]
The use of the dehumidified low-humidity air may be any, and the dehumidifying device according to the present invention can be used for various applications in various fields.
[0040]
In the implementation of the invention according to claim 1, the impure component in the fuel removed by the fuel purifying means is not limited to the odorous component, but if it is an impure component that causes deterioration of the dehumidifying adsorbent layer X, it is attached. Components other than odor components may be targeted for removal.
[0041]
In the implementation of the invention according to claim 1, the fuel of the burner 14 that generates the combustion gas used as the regeneration high-temperature gas is not limited to the gas fuel, and may be a liquid fuel or a solid fuel.
[Brief description of the drawings]
FIG. 1 is a diagram showing the overall configuration of the apparatus. FIG. 2 is a perspective view of an adsorption rotor portion. FIG. 3 is a structural diagram of a fuel adsorbent layer.
3 adsorption rotor
4,7 treatment area
5 regeneration zone 14 burner 14a fuel supply path 15 fuel purification means, fuel adsorbent layer G fuel HA combustion gas, regeneration high temperature gas OA, OA 'air X adsorbent layer for dehumidification

Claims (2)

The air is dehumidified by ventilating the dehumidifying adsorbent layer, and the dehumidifying adsorbent layer used for the air dehumidification is regenerated by ventilating the regeneration high-temperature gas to the dehumidifying adsorbent layer, and then the air is reused. A dehumidifying device configured to be used for dehumidification,
In the rotation path of the adsorption rotor on which the dehumidifying adsorbent layer is arranged, a processing area for dehumidifying the air and a regeneration area for regenerating the dehumidifying adsorbent layer are arranged side by side in the rotor rotation direction,
In the regeneration region, the combustion gas of the burner is vented to the dehumidifying adsorbent layer as the regeneration high-temperature gas,
The combustion gas path for guiding the combustion gas to the regeneration zone is provided with a regeneration-side damper that maintains the processing zone at a positive pressure with respect to the regeneration zone by adjusting the damper opening, and from the fuel supplied to the burner. A dehumidifying device provided with a fuel purifying means for removing impure components that cause deterioration of the dehumidifying adsorbent layer.   2. A dehumidifying apparatus according to claim 1, wherein an air-permeable fuel adsorbent layer for removing odorous components of the gas fuel by adsorption is interposed in the gas fuel supply path to the burner as the fuel purification means.

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