JPH07185305A - Wet type packed tower - Google Patents

Abstract

PURPOSE:To provide a wet type packed tower in which a preliminary cooler is installed there to effectively, surely and preliminarily cool high temp. gas. CONSTITUTION:A preliminary cooler 15 in the form of a horizontal conduit, into which a water spray device 16 is incorporated is installed in the part of a gas inlet 7 of a wet type packed tower 1 in which high temp. gas is cooled by subjecting it to gas-liquid contact with circulating water in the part of a packing material 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet packed column equipped with a precooling device for hot gas.

[0002]

2. Description of the Related Art A wet packed tower in which a passing gas and circulating water come into gas-liquid contact with a packing material installed in the tower is used for cooling high-temperature gas, removing dust and oil droplets in the passing gas, or harmful poisonous substances. It is used for various gas treatments such as the removal of various components and malodorous components.

FIG. 4 shows a typical example of this type of wet packed tower. Explaining the figure, inside the tower body 2 of the wet packed tower 1, the water in the water storage tank 5 is sent by the pump 6 to the sprinkler 4 installed above the packing material 3, and the water sprayed on the packing material 3 is filled. Material 3
It flows down inside and is circulated again in the water storage tank 5. On the other hand, the high temperature gas flowing into the tower from the gas inlet 7 is countercurrently contacted with the circulating water flowing down in the process of rising inside the packing material 3 and is subjected to treatments such as cooling and dust removal, and the treatment is completed. The gas is discharged from the gas outlet 8 to the outside. When performing chemical treatment such as neutralization of acidic gas or alkaline gas and decomposition of malodorous components in addition to cooling and dust removal, add a small amount of chemical solution to the circulating water according to the treatment purpose and perform the above treatment. I do.

As the packing material 3 of this type of wet packed tower,
Generally, a filling material in which corrugated plastic sheets are laminated is used. The reason is that the gas-liquid contact area is large and the pressure loss is small, but the low heat resistant temperature is a weak point of the device. The heat resistance temperature of the commonly used vinyl chloride filler is about 70 ° C, and the heat resistance temperature of polypropylene filler used for high temperature is only 100 ° C, so the gas to be treated is from an incinerator or a metal melting furnace. When the high temperature gas is discharged, it is necessary to sufficiently perform pre-cooling and set the gas temperature to the heat resistant temperature of the packing material or lower before being introduced into the wet packed column.

Next, FIG. 5 and FIG. 6 show a conventional example of a wet packed column for treating high temperature exhaust gas.

In the example of FIG. 5, an unpacked tower 12 having only a water sprinkler 11 installed in the tower is arranged in series in front of the wet packed tower 1 to precool the high temperature exhaust gas. The example in FIG.
A sprinkler device 13 is additionally installed in the tower below the packing material 3 of the wet packed tower 1 to precool the high temperature exhaust gas in the tower. The same reference numerals are used for the parts common to the wet packed column of FIG.

[0007]

However, in the example of FIG. 5, an extra installation area is required for the additional unpacked tower 12, and in the example of FIG. 6, a space for precooling is provided at the bottom of the tower. The height of the tower increases by the amount. Generally, the cooling water used for pre-cooling is easily contaminated due to the rapid progress of pollution due to dust or the like in the gas, and if any of the nozzles of the water spray device 13 in FIG. 6 is clogged. If the sprinkling is stopped partially or insufficiently, there is a risk that the high temperature gas will enter the filler portion without touching the cooling water and the filler will be softened and damaged. The present invention has been made in view of the above problems of the conventional technique, and an object thereof is to provide a wet packed column having a simple structure and a highly reliable cooling function for high-temperature gas. Especially.

[0008]

In order to achieve the above object, the present invention is a wet packed tower in which a gas passing through the inside of a packing material installed in the tower comes into gas-liquid contact with circulating water, and a sprinkler is provided A first aspect of the present invention is a wet-packed tower characterized in that a built-in horizontal pipe-shaped precooling device is attached to a gas inlet portion of a tower body. The second aspect of the present invention is a wet packed tower, which is a countercurrent contact type in which circulating water flowing down through and a gas passing upward through the inside of the packing are in countercurrent contact with each other in the packing portion in the tower, and the above-mentioned first or first invention. In the second invention, the water spraying device of the precooling device is a wet packed tower composed of a plurality of water spray nozzles arranged in the gas flow direction as the third invention, and in the above first, second or third invention, Direct at least the bottom surface of the cooling device to the gas inlet of the wet packed tower. A wet packed column was cormorant down slope to the fourth aspect of the present invention.

[0009]

In the precooling device, a plurality of water spray nozzles are arranged at least in the gas flow direction, and a plurality of water curtains are formed by these nozzles, so that the hot gas passes through these water curtains in sequence. It will be cooled repeatedly. Since the hot gas and the cooling water intersect, if the cooling water is contaminated and one of the nozzles is clogged and the water curtain is not sufficiently formed, the high temperature gas can be reliably collected by the water curtain before and after it. Since it is cooled to 0, there is no risk that the gas flowing into the tower will reach the packing material portion at a high temperature.

[0010]

EXAMPLES The case where the present invention is applied to the treatment of high temperature exhaust gas will be described below with reference to FIG. Since the tower body 2 in FIG. 1 is the same as the tower body in FIG. 4, the same reference numerals are used for common members to avoid duplication of description.

In the apparatus of the present invention, a horizontal pipe-like precooling device 15 is attached to the gas inlet 7 of the wet packed tower 1,
The sprinkler 16 for pre-cooling is provided in the inside. The pre-cooling device 15 expands the cross-sectional area of the exhaust gas introduction pipe to the wet packed tower 1 to provide an installation space for the sprinkler 16 and a space for cooling the exhaust gas, and the pipe cross-section is a cylinder. A shape such as a square cylinder can be adopted.

The water sprinkler 16 in the pipe line is composed of a plurality of water sprinkling nozzles 16a arranged in the exhaust gas flow direction, and the cooling water sprinkled from each nozzle forms a plurality of water curtains in the pipe line. The high temperature exhaust gas is repeatedly cooled by passing through a plurality of water curtains. As the water sprinkling device 16 provided in the preliminary cooling device 15, as shown in FIG. 2, in addition to the structure shown in FIG. It is also possible to employ a configuration in which a plurality of sets arranged in (3) are arranged along the gas flow direction. Further, it is also possible to adopt a configuration in which a plurality of water spray nozzles are arranged in the radial direction of the inner cross section of the pipeline and a plurality of sets are arranged along the gas flow direction.

The cooling of the high temperature exhaust gas is performed by cooling the latent heat transfer center,
That is, since the heat of the exhaust gas is taken by the evaporation of the cooling water,
Even when the temperature of the exhaust gas is extremely high, the temperature of the high-temperature exhaust gas can be lowered to the critical temperature that changes depending on the humidity. As a result, the temperature of the hot exhaust gas can be easily pre-cooled to the heat resistant temperature of the filler or lower.

When the high temperature exhaust gas contains a large amount of dust such as exhaust gas from an incinerator or a powder dryer,
Although the dust in the exhaust gas is captured and the cooling water is rapidly contaminated,
Since at least the bottom surface of the pre-cooling device 15 has a downward gradient S toward the gas inlet 7 of the wet packed tower, the flow of the cooling water in the pipeline becomes active and pollutants do not accumulate.

The polluted cooling water is discarded as it is, or cooled outside the tower and subjected to solid-liquid separation and used again as cooling water. Fresh water is replenished corresponding to the amount of cooling water reduced due to evaporation or disposal, and a constant amount of cooling water is constantly circulated in the cooling water path.

FIG. 3 shows an example in which the wet packed tower 1 of the present invention is applied to the deodorizing device 17 as a pretreatment device having a cooling function, and 18 indicates a dryer. That is, after the high temperature exhaust gas is cooled by the preliminary cooling device 15, the exhaust gas is sufficiently cooled by gas-liquid contact inside the filler 3.

The wet packed tower of the present invention is not limited to the countercurrent contact type wet packed tower as shown in FIGS. 1 and 3, but may also be a cross flow type wet packed tower in which gas laterally passes through the inside of the packing material. Applicable.

[0018]

As described above, the wet packed tower of the present invention is
Since the pre-cooling part for the high-temperature gas was formed using the gas introduction pipe part connected to the gas inlet, the number of additional components is small compared to the conventional wet packed tower, and the high-temperature gas can be pre-cooled efficiently and reliably. can do.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a wet packed tower of the present invention.

FIG. 2 is an enlarged perspective view of a preliminary cooling device portion showing another embodiment of the water sprinkler.

FIG. 3 is a schematic configuration diagram showing an application example of the wet packed tower of the present invention.

FIG. 4 is a schematic configuration diagram showing a typical example of a conventional wet packed tower.

FIG. 5 is a schematic configuration diagram showing another example of a conventional wet packed tower.

FIG. 6 is a schematic configuration diagram showing still another example of a conventional wet packed tower.

[Explanation of symbols]

 1 ... Wet packed tower 2 ... Tower body 3 ... Filler 4 ... Sprinkler 5 ... Water tank 6 ... Pump 7 ... Gas inlet 8 ... Gas outlet 11 ... Sprinkler 12 ... Unfilled tower 13 ... Sprinkler 15 ... Precooler 16 ... Sprinkler 16a ... Sprinkler nozzle 17 ... Deodorizer 18 ... Dryer S ... Downhill

Claims (4)

[Claims] 1. A wet packed tower in which a gas passing through the inside of a packing material installed in the tower comes into gas-liquid contact with circulating water, wherein a horizontal pipe-shaped pre-cooling device having a sprinkler is installed in the tower body gas. A wet packed tower characterized by being attached to an inlet part. 2. The wet packed tower is a countercurrent contact type in which circulating water flowing down inside the packing material and gas passing upward inside the packing material come into countercurrent contact with the packing material portion inside the tower. 1. The wet packed tower according to 1. 3. The wet packed tower according to claim 1, wherein the sprinkler of the precooling device comprises a plurality of sprinkler nozzles arranged in the gas flow direction. 4. The wet packed tower according to claim 1, 2 or 3, wherein at least the bottom surface of the precooling device has a downward slope toward the gas inlet of the wet packed tower.