JPS5924786B2 - air cooling tower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air cooling tower for cooling high temperature gas generated in an electric furnace or the like to a temperature suitable for a bag dust collector.

A conventional air cooling tower has a cylindrical shape with an inlet for high-temperature air and an outlet for cooling air at the top and bottom, and a water tank with the same diameter on the top of the cooling chamber. The cooling chamber was cooled from the outside by flowing down along the outer peripheral wall of the cooling chamber, and the high-temperature air sent into the cooling chamber through the inlet was cooled.

However, in this type of cooling tower, if the horizontal level of the weir is not maintained, overflow water may concentrate in low-level areas, or if scale adheres to the outer wall of the cooling chamber, the cooling water is repelled and its flow is obstructed. The cooling chamber could not be cooled evenly and uniformly, resulting in a decrease in cooling efficiency.

In addition, the water-cooled double-jacket type cooling tower has a drawback that the weight per heat transfer area is heavy, that is, the weight of the metal material is large, and the equipment cost increases.

The present invention forms a sealed air cooling chamber between an inner cylinder and an outer cylinder made of a material with good thermal conductivity, and after overflowing the water supplied into the inner chamber and receiving it in a water storage tank, the outer cylinder peripheral wall The purpose of this invention is to simply provide an air cooling tower that has excellent cooling efficiency and is easy to handle by allowing water to flow out at an appropriate pressure through a gap formed in the cooling chamber to cool the cooling chamber from the inside and outside.

The present invention will be specifically described below based on embodiments shown in the drawings.

The air cooling tower includes an inner cylinder 1 having an open upper end on a bottom plate 20;
An outer cylinder 2 surrounding the outside of the inner cylinder 1 is arranged concentrically,
In addition, the upper ends of the inner and outer cylinders 1 and 2 are sealed with a top plate 21 to form a tower body, and the hollow space formed between the inner cylinder 1 and the outer cylinder 2 is an air cooling chamber 3. be.

An airflow inlet 31 is provided in the upper part of the air cooling chamber 3, and an airflow outlet 33 is provided in the lower part thereof, and an inflow pipe 32 and an outflow pipe 34 are tangentially connected to these inflow and outflow ports 31 and 33. In particular, the air swirling in the cooling chamber 3 is made to flow while contacting the wall surfaces of the inner cylinder 1 and the outer cylinder 2 forming the cooling chamber 3 so that the high-temperature air spirals downward in the cooling chamber 3.

A water supply pipe 12 is vertically inserted into the inner cylinder 1 from the upper opening, and a water supply port 13 opened at the lower end of the pipe 12 is arranged near the bottom of the inner cylinder 1 to supply water from the bottom of the inner cylinder 1. A bent 9b 11 is provided around the inner cylinder wall to absorb the difference in thermal expansion between the inner and outer cylinders 1 and 2.

A drain pipe 16 equipped with an on-off valve 15 that opens into the inner cylinder 1 is connected to the bottom plate 20 .

On the other hand, a water storage tank 4 is provided at the upper end of the side wall of the outer cylinder 2 to collect water overflowing from the inner cylinder 1.The water storage tank 4 has a bottom plate 41 expanded upward so as to surround the upper part of the outer cylinder 2. A circular circumferential wall 42 is continuously formed on the upper edge of the bottom plate 41, and a slight water gap 43 is formed between the lower edge of the bottom plate 41 and the outer cylinder 2 circumferential wall, and the water filling the water storage tank 4 flows through the water flow gap. 43, along the wall surface of the outer cylinder 2, and flows downward at a predetermined speed.

In this embodiment, an adjustment ring 44 made of an elastic material such as rubber that expands upward and can freely move forward and backward in the radial direction is fitted and tightened to the lower end of the bottom plate 41, and the adjustment ring 44 is appropriately protruded from the lower edge of the bottom plate 41. Thus, the gap width of the water flow gap 443 can be adjusted to be averaged over the entire circumference of the bottom plate so that the cooling water can flow out at a constant speed.

The adjustment ring 44 may be formed of sheet metal having elongated holes divided into an appropriate number in the circumferential direction, and may be slidably and adjustable attached to the elongated holes with bolts protruding downward from the bottom plate.

Between the upper end of the bottom plate 41 and the upper end of the outer cylinder 2, a wire gauze 5 of a suitable mesh is stretched in a ring shape to allow water reaching the water flow gap 43 to pass through.

In addition, a water heater 6 equipped with an overflow port 60 is protruded outward from the upper part of the cylindrical peripheral wall 42 of the water tank 40, and an overflow pipe 61 is communicated with the overflow port 60, and a receiving tank I is connected to the lower peripheral wall of the outer cylinder 2. It is designed to accommodate the water flowing out from the overflow pipe 61 and the water flowing down through the water flow gap 43 along the peripheral wall of the outer cylinder 2.

Note that a mat is laid in the receiving tank 7 as necessary to prevent water from scattering again, and the water in the receiving tank 7 is circulated to the water supply pipe 12 via a cooling tower or a water cooler.

When water is supplied into the water supply tank 10 inside the inner cylinder 1 through the water supply pipe 12, the cooling water is filled into the water supply tank 10 and finally overflows into the water storage tank 4 through the upper opening of the water tank 10, and passes through the wire mesh 5. The filtered water flows out of the water flow gap 43 with a pressure proportional to the water level from the water surface of the water storage tank 4, flows down along the wall surface of the outer cylinder 2, and is stored in the receiving tank 7, but in this case, the water supply pipe By appropriately setting the amount of water supplied by 12 to maintain the level of water filling the water tank 4 constant, the amount and flow rate of water flowing out from the water flow gap 43 can be kept constant.

Further, by adjusting the adjustment ring 44, it is also possible to change the flow rate and flow velocity as appropriate.

In this water supply state, high temperature air is introduced into the air cooling chamber 3 from the inlet 31.

The injected high-temperature air swirls inside the cooling chamber 3 and flows while being in contact with the wall surface of the outer cylinder 1.2 while being water-cooled.
During the flow, heat is absorbed by the cooling water through the inner and outer cylinders, and at the bottom of the cooling chamber 3, sufficiently cooled air flows into the outlet 33.
From there, it is sent to the next step, a dust collection device, which sends it out of the cooling chamber 3.

In the above case, the temperature of the cooling water in the water tank 10 rises due to the heat taken from the high temperature room air, and convection occurs, but low temperature water is supplied one after another from the water supply port 13 at the bottom of the water tank 10, and the low temperature water is Because the pressure and high-temperature water is forced upward along the inner wall surface of the inner cylinder 1 by convection, a boundary layer that inhibits heat transfer is formed on the inner wall surface of the inner cylinder 1. The wall surface of cylinder 1 is sufficiently cooled.

On the other hand, in the water storage tank 4 above the water supply tank 10, the cooling water whose temperature has increased due to heat exchange is stagnant, and the cooling water flows down on the wall surface of the outer cylinder 2 through the water flow gap 43, but the water flowing out from the water flow gap 43 is The water is pushed out by a pressure proportional to the water level from the water surface of the water storage tank 4 to the water flow gap 43, and flows down on the wall surface of the outer cylinder 2 at a predetermined velocity. is cooled, and the wall surface of the outer cylinder 2 can be sufficiently and uniformly cooled.

As described above, the present invention forms a sealed air cooling chamber 3 between the inner cylinder 1 and the outer cylinder 2, cools the inner wall of the cooling chamber 3 with cooling water supplied into the inner cylinder 1, and cools the inner wall of the cooling chamber 3. Since the overflowing water is forced to flow out from the water flow gap 43 formed in the circumferential wall of the outer cylinder 2 to cool the outer wall of the cooling chamber 3, an extremely simple and compact structure can be achieved.
The cooling area of the cooling chamber 3 is significantly expanded, and the high temperature air passing through the cooling chamber 3 can be effectively cooled.

In addition, a water supply port 13 is provided at the bottom of the inner cylinder 1 to supply cooling water to the inner cylinder 4.
The water is forced to move upward along the wall surface, while the water flowing through the gap 43
Since the cooling water flowing out onto the wall surface of the outer cylinder 2 comes into contact with the atmosphere and loses its evaporation heat, the inner and outer walls of the cooling chamber 3 can be effectively and uniformly cooled, and the air cooling efficiency can be significantly improved. Moreover, unlike conventional air cooling towers, it does not particularly require horizontal level adjustment or management, and has many excellent effects such as being able to save unnecessary effort and time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an air cooling tower according to the present invention, and FIG. 2 is a plan view. 1... Inner cylinder, 13... Water supply port, 2... Outer cylinder, 3...
...Air cooling chamber, 31...Inlet, 33...Outlet, 4...Water tank, 41...Bottom plate, 43...Water gap.

Claims (1)

[Claims] 1 The outside of the inner cylinder 1 is surrounded by the outer cylinder 2, and the inner and outer cylinders 1
, an air cooling chamber 3 is formed between the two, and an inlet 31 and an outlet 33 are respectively opened to allow air to flow tangentially above and below the cooling chamber 3, and the inner cylinder 1 has its upper end open to supply water. tube 1
2 to open a water supply port 13 in the lower part, and a water tank 4 for storing overflowing water from the inner cylinder 1 is provided at the upper end of the outer cylinder 2, and a bottom plate 41 of the water tank 4 and a peripheral wall of the outer cylinder 2 are provided. An air cooling tower with a flowing water gap 43 formed between the air cooling tower and the air cooling tower.