JPH057724A - Gas-liquid contact device - Google Patents

Abstract

(57) [Summary] Gas-liquid contact device [Purpose] To facilitate the balance between the amounts of gas and liquid. Efficiently contact gas and liquid. [Structure] A plurality of fillers 15 are sequentially arranged in series in a casing 11 from front to back. The gas is transferred from the packing material 15 at the front end to the packing material 15 at the rear end while sequentially passing the packing materials 15. Filling 15 at the end to filling at the front end
The liquid is transferred while sequentially flowing down along each packing 15 up to 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for purifying air containing a relatively low concentration of NOx, such as ventilation air for road tunnels, in order to enhance the efficiency of denitration of air by zeolite, to cool and dehumidify the air. The present invention relates to a gas-liquid contact device used for

[0002]

2. Description of the Related Art As a conventional apparatus of this type, as shown in FIG. 2, a filler 62 is arranged in the middle of the height of a casing 61, and a warm air inlet 63 is provided near the lower end of the peripheral wall of the casing 61. A cold air outlet 64 is provided at the center of the top wall of the casing 61, a cold water inlet 65 is provided near the upper end of the peripheral wall of the casing 61, and a pipe with a tip water spray nozzle 66 is provided at the cold water inlet 65.
It is known that the base end of 67 is connected and a hot water outlet 68 is provided in the central portion of the bottom wall of the casing 61 to bring cold water and hot air into contact with each other to obtain hot water and cold air.

As another conventional apparatus, as shown in FIG. 3, two packings 72 are arranged in a casing 71 in two upper and lower stages, and an intermediate tray 73 is arranged between the two packings 72.
A warm air inlet 74 is provided near the lower end of the peripheral wall of the casing 71, and a cold air outlet 75 is provided at the center of the top wall of the casing 71, and the upper filling material 72 extends upward from the tray 73 and has a tip water spray nozzle 76 as the upper filling material. 72 is provided with an upper circulation pipe 77 facing from above, and the lower filling 72 is provided with a circulation pipe 77 extending upward from below to make the tip water spray nozzle 76 face the lower filling 72 from above. Known are known.

[0004]

In the device shown in FIG. 2,
It is desirable to keep the cold air temperature as low as possible and the hot water temperature as high as possible (ideally, the cold air temperature and the cold water temperature are equal,
Hot water temperature and hot air temperature are equal).

In principle, if the tower height L is sufficient, the above ideal is achieved. However, in this case, it is necessary to reduce the amount of water sprayed to the amount of air very much due to the air-water balance. If the tower diameter is too large for the amount of water sprayed,
Cold water does not flow evenly into the tower, gas-liquid contact becomes insufficient, and efficient heat exchange cannot be performed. On the contrary, if the tower diameter is too small with respect to the air flow rate, the pressure loss of the air flow is high, the air flow velocity is high, and the liquid is likely to be blown up (flatting phenomenon).

Although it depends on the operating conditions, it is difficult to design a device in which the air-water is balanced, and in reality, a design focusing on one of the cold air temperature and the hot water temperature is made.

In the apparatus shown in FIG. 3, air-water is balanced by sufficiently circulating the liquid for each packing 72 in each stage, but there is a problem that the pressure loss at the intermediate tray 73 is large. There is. Further, since the liquid is completely mixed in each stage, there is a problem that the desired performance cannot be obtained unless the number of stages is reduced.

An object of the present invention is to provide a gas-liquid contact device that solves the above problems.

[0009]

SUMMARY OF THE INVENTION A gas-liquid contactor according to the present invention comprises a plurality of packings arranged in series in the casing from front to back and a packing at the front end to a packing at the rear end. A gas transfer means for transferring the gas while sequentially passing each filling up to and a liquid transfer means for transferring the liquid while sequentially flowing down from the rearmost packing to the frontmost packing. It is equipped.

[0010]

In the gas-liquid contactor according to the present invention, since a plurality of packings are sequentially arranged in series in the casing from the front to the back, even if sufficient liquid is circulated to each packing, the above-mentioned flag is generated. The pressure loss is small because there is no such phenomenon as the intermediate tray of the conventional device.

Further, the apparatus further includes a gas transfer means for transferring gas from the frontmost packing to the rearmost packing while sequentially passing each packing, and from the rearmost packing to the frontmost packing. Since the liquid transfer means for transferring the liquid while sequentially flowing down each packing is provided, the gas flows from the front to the rear in the casing, and the liquid flows from the rear to the front while flowing each packing, The flow of gas and liquid becomes countercurrent.

[0012]

Embodiments of the present invention will be described below with reference to FIG.

The gas-liquid contact device has a box-shaped casing 11 which is long in the front-rear direction. The front end wall of the casing 11 is provided with a warm air inlet 12 and the rear end wall thereof is provided with a cold air outlet 13. Three upper bulges 14 are provided on the top wall of the casing 11. Three fillers 15 are arranged in the casing 11 so as to be located immediately below each bulge portion 14. Each filling 15 is provided with a vertical first partition plate 16 rising from the bottom wall of the casing 11 and a vertical second partition plate 17 having a gap between the vertical partition wall 16 and the bottom wall of the casing 11. The circulation pipe 21 that rises from a position slightly rearward of the second partition plate 17 and penetrates the top of the corresponding bulging portion 14 and extends therein.
Is provided. A pump 22 is provided in the middle of the length of the circulation pipe 21, and a water spray nozzle 23 is provided at the tip of the pump 22.
Is provided. The cold water supply pipe 31 is connected to the rearmost circulation pipe 21 of the three circulation pipes 21, and the hot water discharge pipe 32 is connected to the lower end portion of the front end wall of the casing 11.

Hot air is introduced into the casing 11 through the hot air inlet 12 and cold air is led out through the cold air outlet 13, so that an air flow from the front to the rear is generated in the casing 11.

On the other hand, in each filling 15, by the operation of the pump 22, a sufficient amount of cold water (hot water depending on the location) is sprayed from the nozzle 23 through the circulation pipe 21, and the sprayed cold water is filled. Run down along Object 15. The cold water that has flowed down is divided into two streams, a backward stream and a forward stream, by both partition plates 16 and 17, but it is preferable that the amounts of the divided two streams are substantially equal. The downstream cold water is circulated to the packing 15 just flown down, and the downstream cold water is sent to the packing 15 immediately before the packing 15 just flown down to be circulated. Then, the cold water (hot water in this place) that has flowed down the filling material 15 at the foremost end and has become the front flow is discharged to the outside of the casing 11 through the discharge pipe 32. Further, cold water corresponding to this discharged portion is supplied to the rearmost circulation pipe 21 through the cold water supply pipe 31.

[0016]

According to the present invention, even if a sufficient amount of liquid is circulated for each packing, the above-mentioned flattening phenomenon does not occur, and there is no intermediate tray of the conventional apparatus, so that pressure loss is eliminated. Is small, it is easy to balance the amounts of gas and liquid.

Further, gas flows from front to back in the casing, and liquid flows from back to front while flowing down each packing,
Since the gas and the liquid flow countercurrently, the gas and the liquid can be efficiently brought into contact with each other.

[Brief description of drawings]

1 is a vertical longitudinal sectional view of a device according to the present invention.

FIG. 2 is a vertical vertical sectional view of a conventional device.

FIG. 3 is a vertical longitudinal sectional view of another conventional device.

[Explanation of symbols]

 11 Casing 12 Hot air inlet 13 Cold air outlet 21 Circulation pipe 31 Cold water supply pipe 32 Hot water discharge pipe

Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location B01D 53/34 130 D 6953-4D B01F 5/00 Z 9260-4G F28C 1/04 7153-3L

Claims (1)

Claims: 1. A plurality of packings 15 arranged in series in the casing 11 sequentially from the front to the back, and each packing from the packing 15 at the frontmost end to the packing 15 at the rearmost end. Object 15
Gas transfer means for transferring the gas while sequentially passing through, and each packing 15 from the packing 15 at the end to the packing 15 at the front end.
A gas-liquid contactor comprising: a liquid transfer means for transferring the liquid while sequentially flowing down.