JP3995436B2 - Air washer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air washer and relates to a technique for removing dust and harmful gases in the air and cooling the air in a cold water spray air washer or the like.
[0002]
[Prior art]
An example of a conventional cold water spray air washer is shown in FIG. In FIG. 7, the air washer has a water spray chamber 12 of a predetermined length inside a main body casing 11 having a rectangular channel cross section, and the water spray chamber 12 has a duct ( The airflow flowing in from this duct flows out from the air outlet 13b formed at the other end through the flow path of the water spray chamber 12.
[0003]
In the water spray chamber 12, a first washer medium 14 is disposed on the air inlet 13a side, and a second washer medium 15 is disposed on the air outlet 13b side. It has a shape substantially equal to the cross section of the flow path.
[0004]
Inside the water spray chamber 12, banks 16 are provided in multiple stages along the air flow direction, and each bank 16 is provided with a plurality of spray nozzles 17 that eject spray water toward the upstream direction of the air flow. ing. A water storage tank 18 for receiving the spray water flowing down is provided at the lower part of the water spray chamber 12, and a circulating water supply system 19 for circulating and supplying the circulating water staying in the water storage tank 18 to each bank 16 is provided at the lower part of the water storage tank 18. Communicate.
[0005]
The circulating water supply system 19 is provided with a circulation pump 20 and a heat exchanger 21, and the circulating water is cooled to a predetermined temperature by primary cold water having a predetermined temperature supplied to the heat exchanger 21. A makeup water supply system 22 opens on the upstream side of the main casing 11, and a drain system 23 and an overflow system 24 are connected to the water storage tank 18.
[0006]
[Problems to be solved by the invention]
In the conventional configuration described above, the total amount of circulating water sprayed from the spray nozzles 17 of each bank 16 flows to the heat exchanger 21 through the circulating water supply system 19, and the total amount of circulating water is converted into primary cold water in the heat exchanger 21. Heat exchange between.
[0007]
In order to cool the air to a normally required temperature with an air washer, the amount of circulating water is required to be greater than the weight of air (L / G> 1.0), and the circulating water from the heat exchanger 21 toward each bank 16 is required. The temperature difference between the feed temperature of the circulating water and the return temperature of the circulating water returning from each bank 16 to the heat exchanger 21 is small and the return temperature of the circulating water does not increase, so the outlet temperature of the primary cold water returning from the heat exchanger 21 to the refrigerator In order to secure a predetermined temperature difference between the inlet temperature and the outlet temperature of the primary chilled water in the heat exchanger 21, it is necessary to lower the inlet temperature of the primary chilled water, which reduces the efficiency of the refrigerator. Since the amount of circulating water is large and the temperature difference between the return temperature of the circulating water and the outlet temperature of the primary cold water does not increase, it is necessary to increase the size of the heat exchanger 21 in order to widen the heat transfer area.
[0008]
This invention solves the above-mentioned subject, raises the return temperature of the circulating water to a heat exchanger, enlarges the cooling temperature difference of circulating water, and prevents the fall of the outlet temperature of the primary cold water in a heat exchanger. The purpose is to provide an air washer.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the air washer of the present invention is provided with banks in multiple stages along the flow direction of the air flow in a water spray chamber in which an air flow is generated from the air inlet toward the air outlet. Provided with a plurality of spray nozzles for spraying spray water in the air flow, spray water sprayed from each spray nozzle of each bank flows, and a reservoir for mixing and storing the spray water that has flowed down is provided. cooling and uncooled circulating water system is provided between the front side of the bank arranged on the upstream side of the air flow, having a heat exchanger between the rear stage side of the bank arranged on the downstream side of the water tank and the air flow A circulating water system is provided.
[0010]
With the configuration described above, the circulating water staying in the water storage tank is divided into an uncooled circulating water system and a cooled circulating water system, and the circulating water flowing through the uncooled circulating water system is circulated to the bank on the preceding stage without being cooled and is supplied from the spray nozzle. The circulating water sprayed in the air stream and flowing through the cooling circulating water system is cooled by the heat exchanger and then circulated to the bank on the rear stage side and sprayed from the spray nozzle into the air stream.
[0011]
Therefore, the cooling circulating water sprayed in the latter bank cools the air and is heated to fall into the water storage tank, and the non-cooling circulating water sprayed in the preceding bank cools the air on the washer inlet side, The temperature rises above the circulating water temperature and falls to the water tank. By mixing both the circulating water in the water storage tank, the return temperature of the cooling circulating water system entering the heat exchanger inlet is kept high.
[0012]
In this way, the circulating water is diverted, and a part of the diverted circulating water is cooled, so that compared with the conventional case where the entire amount of circulating water is cooled, heat is generated under the same conditions of the circulating water amount and the heat load. The return temperature of the circulating water in the exchanger can be kept high, and a predetermined temperature difference that is ensured between the inlet temperature and the outlet temperature of the primary cold water in the heat exchanger can be set in a higher temperature range than before. The heat exchanger can be greatly downsized without reducing the operating efficiency of the refrigerator.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Members that perform the same operations as those shown in FIG. 7 are assigned the same reference numerals, and descriptions thereof are omitted.
[0014]
Example 1
As shown in FIG. 1, a plurality of banks 16a, 16b, and 16c are provided in the water spray chamber 12 in order from the upstream side to the downstream side along the flow direction of the air flow generated from the air inlet 13a to the air outlet 13b. In each of the banks 16a, 16b, and 16c, a plurality of spray nozzles 17 for spraying spray water toward the upstream side of the air flow are provided.
[0015]
A circulating water supply system 19 that communicates between the water storage tank 18 through which the spray water flows and the banks 16a, 16b, and 16c branches on the way into an uncooled circulating water system 19a and a cooled circulating water system 19b, and an uncooled circulating water system 19a. Is communicated with the upstream banks 16a and 16b disposed upstream of the air flow, and the cooling circulation water system 19b is communicated with the downstream bank 16c disposed downstream of the air flow via the heat exchanger 21.
[0016]
Hereinafter, the operation of the above-described configuration will be described. The circulating water staying in the water storage tank 18 by the driving of the circulation pump 20 is divided into the uncooled circulating water system 19a and the cooled circulating water system 19b through the circulating water supply system 19.
[0017]
The circulating water flowing through the non-cooled circulating water system 19a is not cooled and circulated to the banks 16a and 16b on the preceding stage and sprayed into the air stream from the spray nozzle 17, and the circulating water flowing through the cooling circulating water system 19b is passed through the heat exchanger 21. After being cooled, it is circulated to the bank 16c on the rear stage side and sprayed from the spray nozzle 17 into the air flow.
[0018]
The spray water contacts the air flow to remove dust and harmful gases in the air and cool the air. At this time, there is a temperature difference between the spray water (14 ° C.) sprayed from the banks 16a and 16b on the front side and the spray water (8.5 ° C.) sprayed from the bank 16c on the back side.
[0019]
FIG. 2 is an air diagram showing changes in air flowing through the water spray chamber 12, and FIG. 3 is a graph showing changes in temperature of air and spray water. Spray water (9.5 ° C.) in which the entire amount of circulating water is cooled as in the conventional case and spray water (14 ° C.) that is not cooled from the banks 16a and 16b on the previous stage, under the same conditions as the amount of circulating water and heat load. The same cooling effect can be obtained by spraying spray water (8.5 ° C.) cooled from the bank 16c on the rear stage side.
[0020]
The spray water from each bank 16 a, 16 b, 16 c flows with the air flow and collides with the washer media 14, 15, travels down the washer media 14, 15 to the water storage tank 18, and is mixed in the water storage tank 18. That is, the spray water that has passed through the uncooled circulating water system 19a flows down to the water storage tank 18 at 16 ° C., and the sprayed water that has been cooled by the heat exchanger 21 through the cooling circulating water system 19b flows down to the water storage tank 18 at 12 ° C. Then, the mixed water of both becomes 14 ° C., the temperature rises to 12 ° C. or higher, and returns to the heat exchanger 21.
[0021]
Therefore, in the heat exchanger 21, the inlet temperature (7 ° C.) of the primary cold water is maintained higher than the conventional temperature (6 ° C.), and the predetermined temperature is ensured between the inlet temperature (7 ° C.) and the outlet temperature (12 ° C.). The difference can be set in a higher temperature range than before.
[0022]
Further, the amount of circulating water passing through the heat exchanger 21 may be equivalent to L / G = 0.7, 44% of the conventional amount (corresponding to L / G = 1.6), and the size of the heat exchanger 21 can be reduced. . As shown in FIG. 4, the circulation pump 20 can also be provided in each of the non-cooling circulation water system 19a and the cooling circulation water system 19b.
[0023]
As shown in FIG. 5, the banks 16 a and 16 c can be provided in two stages in the water spray chamber 12.
As shown in FIG. 6, the water storage tank 18 can be provided separately from the main body casing 11.
[0024]
【The invention's effect】
As described above, according to the present invention, the circulating water is diverted, and a part of the diverted circulating water is cooled, so that the amount of circulating water and heat are reduced as compared with the conventional case where the entire amount of circulating water is cooled. The return temperature of the circulating water in the heat exchanger can be kept high under the same load conditions, and a predetermined temperature difference is ensured between the inlet temperature and the outlet temperature of the primary chilled water in the heat exchanger. The heat exchanger can be greatly reduced in size without reducing the operating efficiency of the refrigerator.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an air washer in an embodiment of the present invention.
FIG. 2 is an air diagram in the same embodiment.
FIG. 3 is a graph showing temperature changes of air and spray water in the same embodiment.
FIG. 4 is a piping diagram showing a main part in another embodiment of the present invention.
FIG. 5 is a cross-sectional view of an air washer according to still another embodiment of the present invention.
FIG. 6 is a cross-sectional view of an air washer according to still another embodiment of the present invention.
FIG. 7 is a cross-sectional view of a conventional air washer.
[Explanation of symbols]
11 Body casing 12 Water spray chamber 13a Air inlet 13b Air outlets 14, 15 Washer media 16a, 16b, 16c Bank 17 Spray nozzle 18 Water tank 19 Circulating water supply system 19a Uncooled circulating water system 19b Cooling circulating water system 20 Circulating pump 21 Heat exchange Equipment 22 Makeup water supply system 23 Drain system 24 Overflow system

Claims (1)

In the water spray chamber in which an air flow is generated from the air inlet to the air outlet, banks are provided in multiple stages along the air flow direction, and each bank is provided with a plurality of spray nozzles that eject spray water into the air flow. Spray water sprayed from each spray nozzle of each bank flows down, a water storage tank is provided for mixing and storing the spray water that has flowed down, and between this water storage tank and the upstream bank disposed upstream of the air flow the uncooled circulating water system is provided, an air washer, characterized in that a cooling circulating water system having a heat exchanger between the rear stage side of the bank arranged on the downstream side of the water tank and the air flow.

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