JP4583637B2 - Air purification air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a means for removing and purifying soluble pollutant gases such as SO ₂ from the outside air in order to introduce the outside air into a clean room in which equipment for generating heat is installed. In particular, the present invention relates to an air-conditioning means capable of enhancing the air purification function during the humidification period from autumn to spring when the outside air humidity is low.
[0002]
[Prior art]
Conventionally, the means shown in FIG. 5 (a) is known as means for purifying and air-conditioning outside air. In the figure, a cooling coil 2, a heating coil 3, an air washer 4, and a dew point meter (humidity meter) 5 are sequentially arranged in a housing 1 for taking in outside air. Here, the air humidified to a predetermined absolute humidity is The air is supplied to the air chamber (clean room) through a filter including a blower, a chemical filter, and a HEPA filter. The air washer 4 includes a spray device 4a, a hydrophilic eliminator 4b, and an absorption water tank 4c. The water washer is circulated by a pump and sprayed from a nozzle to absorb soluble polluted gas and increase air humidity. If the concentration of the pollutant gas in the water w increases, it is diluted with fresh absorbed water (for example, pure water). In addition, the state of the air of the part which attached | subjected ad in the figure is shown as state point ad in FIG.5 (b) which shows the state of the air by the process of this apparatus in a humidifier.
[0003]
The humidity of the processing air is controlled by changing the amount of hot water supplied to the heating coil 3 by adjusting the two-way electric valve 3 a for hot water by a signal from a dew point meter 5 installed downstream of the air washer 4. For example, when the processing air does not reach the set absolute humidity, the dew point meter 5 measures a low value. Therefore, the opening of the hot water amount adjusting valve 3a is increased by the signal, and the air temperature is increased to increase the absolute humidity. Is raised.
[0004]
FIG. 5 (b) is an air diagram of the above means, and the low-temperature and low-humidity outside air a in the humidification period is adjusted to a point d at a temperature of 23 ° C. and an absolute humidity of 7.8 g / kg (DA) in the air to be treated. Then, it is mixed with the air in the clean room to be in the state of point e. Reference numerals b, c, and d indicate the transition of the air state as the processing operation is performed up to that point.
[0005]
First, the outside air is heated up to b by the heating coil 3 upstream of the air washer 4 and is humidified by the air washer 4 (the temperature is lowered) to a predetermined absolute humidity of 7.8 g / kg downstream of the air washer 4. At this time, the humidification amount is controlled by adjusting the amount of hot water supplied to the heating coil 3 via the heating amount control valve 3a by the dew point of the dew point meter 5. For example, when the set absolute humidity is not reached, a low value is measured by the dew point meter 5, and the opening degree of the heating amount control valve 3a is increased by the signal, and the outside air heating temperature b rises. When the processing air temperature rises, the amount of humidification increases, the absolute humidity rises to the set value c, the temperature rises to d due to the frictional heat of the blower 12, the filter 7 and the air, and the heat generated by the blower motor, and is sent to the clean room. Mixing with room air, it becomes the state of point e.
[0006]
In this conventional apparatus, the soluble pollutant gas in the processing air is absorbed to some extent by the water by the air washer 4, but further improvement in performance has been demanded. In Japanese Patent Application Laid-Open No. 2000-279741, the present applicant filed an invention in which a gas-liquid contact is performed to first remove soluble gas, and then a secondary removal is performed by a cooling coil. However, in the winter when the outside air is originally dry, the desired indoor humidity could not be obtained when cooling and condensing the soluble gas. Furthermore, there was room for improvement in energy saving.
[0007]
[Problems to be solved by the invention]
This invention makes it a subject to obtain the air-conditioning means which can fully remove soluble pollutant gas, implement | achieving an energy saving operation, even in the humidification period which does not dehumidify from external air.
[0008]
[Means for Solving the Problems]
One of the air purification air conditioning methods for solving the above problems includes a cooling coil, a heating coil, an air washer, and humidity detection means in a housing that sucks outside air as processing air, and controls the temperature of the processing air. In an air purification air conditioning method that absorbs soluble pollutant gas in the air by gas-liquid contact in the air washer, the air washer humidifies more than the set absolute humidity of the air-conditioned room, and a dehumidification coil provided downstream of the air washer The air is cooled and dehumidified until the set absolute humidity of the air-conditioned room is reached.
In another air purification air conditioning method, a cooling coil, a heating coil, an air washer, and a humidity detecting means are provided in a housing that sucks outside air as processing air, and the temperature of the processing air is controlled, and the air washer is contacted by gas-liquid contact. In the air purification air conditioning method for absorbing soluble pollutant gas in the air and cooling and dehumidifying the air with a dehumidifying coil provided downstream of the air washer, a preheating coil capable of absorbing the cold of the outside air at the outside air inlet in the housing. The cooling heat absorbed by the preheating coil is used for cooling by the dehumidifying coil.
[0009]
In addition, an air purification air conditioner for this purpose includes a cooling coil, a heating coil, an air washer , a dew point meter, etc. in a housing that sucks outside air, controls the temperature of the outside air, and sprays absorbed water from the air washer. In an air purification air conditioner configured to absorb soluble pollutant gas in the air, a preheating coil capable of absorbing the cold of the outside air is provided at the outside air inlet in the housing, and the heating temperature of the processing air is set upstream of the air washer. A heating coil that can increase the amount of humidification by the air washer is provided above the temperature. Cooling and dehumidification of the air that has been excessively humidified during the humidification period is possible downstream of the air washer, and air can be reheated during the dehumidification period. The dehumidifying / reheating coil is provided, and the cold heat absorbed by the preheating coil during the humidification period is used for cooling the dehumidifying / reheating coil via circulating water.
[0010]
In the above-described method and apparatus, the amount of soluble pollutant gas removed is increased by dehumidification of the increased amount of humidification.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (a) shows a first embodiment, in which a cooling coil 2, a heating coil 3, an air washer 4, and a dew point meter 5 are contained in a housing 1 in the same manner as shown in FIG. The blower 6 and the filter 7 are installed outside the housing 1 in the order in which the air to be treated passes. The air washer 4 includes a spraying device 4a composed of a standing pipe and a nozzle, a breathable capturing portion 4b that captures the absorbed water by inertial collision, a water tank 4c, a circulation pump, and the like. In addition, the structure which makes an absorption water flow down to a filler and a hydrophilic eliminator can be illustrated. In addition, a preheating coil 10 is installed in the housing 1 on the upstream side of the cooling coil 2, and a dehumidifying / reheating coil 12 is installed on the downstream side of the air washer 4. The dew point meter 5 is installed downstream of the dehumidifying / reheating coil 12 to measure the temperature-conditioned air, and may be installed in the path of the processed air before reaching the air-conditioned room. Not limited to the housing. The temperature sensor is installed between the air washer and the dehumidifying / reheating coil in order to measure the temperature fluctuated by gas-liquid contact with the air washer.
[0012]
The preheating coil 10 and the dehumidification / reheating coil 12 are connected by water passages 13 and 14, and an inverter control pump 15 and a heat exchanger 16 are interposed in the water passage 13. Cooling with cold water passing through the cold water pipe 17 is possible. The cold water pipe 17 can be branched from a pipe for cooling the circulating air in the air-conditioned room, for example. More specifically, a part of cold water of a sensible heat exchanger (registered trademark “dry coil”) system for cooling the clean room can be used.
[0013]
In the humidification period when the outside air is dried at a low temperature, the cold heat obtained from the outside air by the preheating coil 10 is transmitted to the dehumidification / reheating coil 12 to effect dehumidification (act as a dehumidification coil), and the heat obtained by dehumidification is preheated. Tell the coil 10 to preheat the outside air. At this time, the valve of the cold water pipe 17 is closed and heat exchange in the heat exchanger 16 is not performed. FIG. 1B is an air diagram showing the state of air at positions a to f when the apparatus of FIG. 1A is used in the humidification period. The outside air a is dehumidified downstream of the air washer 4. The reheated coil 12 is heated to b by the return water of the circulating water used for cooling and dehumidification, and further heated to the temperature c greatly exceeding 23 ° C. by the heating coil 3. Then, the air washer 4 humidifies the humidified amount A to the point d along the isenthalpy line, and then in the dehumidifying / reheating coil 12 to the point e along the saturation line by the cold heat supplied from the preheating coil 10. While receiving the dehumidifying action corresponding to the dehumidifying amount B and being sent to the clean room by the blower 6, the blower 6 and the filter 7 receive heat such as frictional heat to be in the state f. By dehumidifying the dehumidifying amount B, a water film is formed on the coil surface, and the soluble gas that cannot be removed by the air washer is absorbed and removed. The absorbed water w containing the soluble polluted gas is drained alone or discharged after being mixed with the water tank 4c. The housing bottom plate may be formed in a downward slope from the dehumidifying / reheating coil 12 to the water tank 4c.
[0014]
In the above apparatus, the temperature of water sent to the dehumidification / reheating coil 12 varies depending on the absolute humidity condition of the supply air. For example, under the condition of 7.8 g / kg (DA), the dew point temperature is about 10.5 ° C. Therefore, it is desirable that the temperature is about 7 ° C.
[0015]
When the cold heat from the preheating coil 10 is insufficient, the valve attached to the outgoing pipe of the cold water pipe 17 is opened, and the cold water from the refrigerator is sent from the cold water pipe 17 to the heat exchanger 16 to be lowered to the required temperature. The humidification amount for the processing air is adjusted by controlling the opening degree of the two-way motor-operated valve 3a that controls the amount of hot water supplied to the heating coil 3 according to the temperature downstream of the air washer 4 or the dew point temperature. The amount of dehumidification in the dual-purpose coil 12 is performed by adjusting the amount of water by controlling the pump 15 according to the dew point temperature of the dew point meter 5. The air that has been processed in this way and is in the state e is heated slightly to become f as described above and is supplied to the clean room. Since the dew point meter is expensive, a thermometer may be used to calculate the absolute humidity back from the measured temperature, or a hygrometer may be used to perform feedback control from the relative humidity measurement value.
[0016]
The experimental results of measuring the SO ₂ gas removal performance using this apparatus are shown in FIGS. FIG. 2 shows the relationship between the dehumidification amount in the dehumidification / reheating coil 12 downstream of the air washer 4 and the SO ₂ gas removal rate. According to this, when the dehumidification amount is 0, the removal performance is 0, but the dehumidification is performed. A removal rate exceeding 65% was obtained at an amount of 9 g / kg (DA), and it was proved that the removal performance surely increased as the dehumidification amount increased.
[0017]
FIG. 3 shows the total removal rate of SO ₂ gas in both the air washer 4 and the dehumidification / reheating coil 12 with the dehumidification amount as a parameter. The removal performance when the dehumidification amount is 0 is about 75%, which indicates the removal performance of the air washer 4 alone in the humidification period. The overall removal performance increased as the dehumidification amount increased, and a high performance exceeding 90% was confirmed at a dehumidification amount of 8 g / kg (DA).
[0018]
As described above, it was proved that the removal performance of the soluble pollutant gas can be easily improved by about 10% by performing extra dehumidification to the outside air during the humidification period. Moreover, excessive moisture can be dehumidified to prevent condensation in the air conditioning room or supply duct.
[0019]
Further, in this apparatus, during a relatively high temperature and high humidity dehumidification period from spring to autumn, high temperature outside air is used as a heat source for reheating the processing air downstream of the air washer 4. That is, by precooling the high temperature outside air by the preheating coil 10 and supplying the water whose temperature has been raised by the precooling to the dehumidification / reheating coil 12, the air cooled by the cooling coil 2 can be reheated. Reheating prevents condensation and improves the temperature distribution. In addition, it can replace with the coil 12 for both dehumidification and reheating, and can also be used as a coil only for dehumidification.
[0020]
FIG. 4 shows the second embodiment. Compared to the first embodiment, FIG. 4 shows that 1) the cooling coil 2 is installed on the downstream side of the air washer 4, and 2) the blower 6 is installed in the most upstream part. 3) In the control of the circulating water amount for dehumidifying excess humidified water during the humidification period, the bypass pipe 13a and the three-way electric motor are connected to the cold water passage 13 sent to the dehumidification / reheating coil 12 instead of the pump control. Although the valve 13b is installed and the electric valve 13b is adjusted to open and close to control the amount of cold water, etc., the other configurations are the same and the dehumidifying and purifying actions are the same. In particular, the advantage of this embodiment is that the amount of dehumidification that can be dehumidified increases in summer, and the performance of removing soluble gases is enhanced.
[0021]
【The invention's effect】
As described above, the present invention introduces means for removing soluble pollutant gas by dehumidifying excess humidified water by increasing the amount of humidification that can be placed in the humidification period to be greater than the required humidification amount. Since the gas removal effect by dehumidification can be obtained even during the humidification period, the total gas removal performance combined with the air washer can be improved. At the same time, there is an effect that the amount of input energy required for the treatment can be greatly reduced by utilizing the cold heat obtained from the low intake outside air during the humidification period for dehumidification.
[Brief description of the drawings]
FIG. 1 is a layout diagram and an air diagram of the first embodiment of the present invention. FIG. 2 is a graph showing a relationship between a dehumidification amount and a gas removal rate in a dehumidification coil. FIG. 4 is a layout diagram of the second embodiment. FIG. 5 is a layout diagram and an air line diagram of a conventional apparatus.
2 Cooling coil 3 Heating coil 4 Air washer 5 Dew point meter 6 Blower 7 Blower 10 Preheating coil 12 Dehumidification / reheating coils 13, 14 Water passage

Claims (3)

A cooling coil, heating coil, air washer, and humidity detection means are provided in the housing that sucks in outside air, and the temperature of the outside air is controlled, and absorbed water is sprayed from the air washer to absorb soluble pollutant gas in the air. In the air purification air conditioner, a preheating coil that can absorb the cold of the outside air is provided at the outside air inlet in the housing, and a heating coil that can increase the amount of humidification by the air washer by controlling the heating temperature of the processing air upstream of the air washer. provided, downstream of the air washer, can be extra cooled dividing the humidified air humidity in the humidifying period, dehumidification and re-heat dual coil capable reheat the air provided to the dehumidification phase, dehumidification, reheating and preheating coil the circulation path is formed by connecting the dual coil through the first water passage and the second water passage, a cold heat absorbed in the preheating coil humidification period, dehumidification, via circulating water Was used to cool the heat dual coil, dehumidification phase air cleaning air conditioning system the absorbed heat in the preheating coil, characterized in that it utilizes the heat of the dehumidifying-reheat dual coil through the circulating water. The air purification air conditioner according to claim 1, wherein the heating amount of the heating coil is controlled by the temperature of a thermometer provided downstream of the air washer, the humidity of the hygrometer, or the dew point of the dew point meter. The air purification air conditioner according to claim 1, wherein cooling with cold water is added to the circulating water for cooling the dehumidifying coil through a heat exchanger.

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