JP2000157833A - Gas-liquid contact reaction tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance contact efficiency to increase flow velocity to reduce the vol. of a reaction tower. SOLUTION: A flotation preventing material 3 is provided in the upper part in a reaction tower while a sedimentation blocking material 4 is provided in the lower part therein and the intermediate space between both materials 3, 4 is packed with a granular contact material 2 of a foamed polystyrene resin having a large specific surface area and a water tank 5 and a circulating pump 6 are provided in the lower part of the reaction tower while a water sprinkling nozzle 8 and a washing nozzle 8a are provided in the upper part thereof and contaminated water is allowed to flow in the lower part of the reaction tower so as to flow along the upper surface of the water tank and countercurrently brought into contact with water sprinkled from above to remove a malodor and dust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact reaction tower between an odor gas, a chemical, and an aqueous solution when deodorizing odor gas generated in a sewage treatment process in a sewage treatment plant, a human waste treatment plant, and the like. It is related to the deodorization treatment accompanying the treatment. At the same time, the treatment of automobile exhaust gas containing dust in a road tunnel or the like is performed by a gas-liquid contact tower, and is related to exhaust gas treatment as an incidental facility of road traffic facilities.

[0002]

2. Description of the Related Art Conventionally, Raschig rings, terrarets, etc. of about 30 m / m to 100 m / m have been mainly used as contact materials for reaction towers, but these have relatively large porosity and low gas passage resistance. Although small, the contact area per unit is small, and the odor removal efficiency by gas-liquid contact is not good.
That is, the overall efficiency is covered by increasing the size of the device and decreasing the wind speed.

[0003]

SUMMARY OF THE INVENTION It is a main object of the present invention to provide a reaction tower which has a large specific surface area by means of an internal filling contact material, reduces the volume of the apparatus, and is still more efficient.

[0004]

The contact material 2 of the reaction tower 1 has a specific gravity of 0.02 to 0.06 and a particle size of 3 m / m to 3 m / m.
A granular contact material of 5 m / m or less of expanded polystyrene resin or expanded polystyrene resin is selected and used according to load conditions. On the upper and lower sides of the reaction tower 1, a floating prevention material 3 and a settlement prevention material 4 made of a screen or wire mesh are provided. A water storage tank 5 and a low-speed circulation pump 6 are provided at the lower part of the reaction tower, a water or chemical spray nozzle 8 and a washing nozzle 8a are provided at the upper part, and a water storage valve 14 for changing the water level of the water storage tank 5 and a water level gauge 15 are provided. I do. Further, a makeup water pipe 9 and an air inflow pipe 10 are provided.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has two cases, that is, removal of dust from contaminated air and removal of odor. The removal of dust is mainly by water washing, and the makeup water and the inside of the water storage tank 5 are water. 5 m / m of expanded polystyrene resin as the contact material 2
Fill with granular contact material. The contact material may have a different particle size depending on the nature of the dust and local conditions. Then, the contaminated air is caused to flow in from the air inflow pipe 10, and at the same time, the circulation pump 6 is normally operated at a low speed to spray water from the spray nozzle 8. The contaminated air containing dust is diffused in the air chamber and flows into the contact material 2 on average through the settling prevention plate 4, and the surface of the contact material is wet by the scattered water, and the dust in the air adheres to the water. To separate from air. Further, the substance that dissolves in water is dissolved in water, separated and removed from air, and flows into a water storage tank.

[0006] Dust mainly adheres to the lower part and increases the air passage resistance. The circulation pump 6 is operated at a high speed for dusty air, and the water spray nozzle 8 and the cleaning nozzle 8a are opened to spray water at the same time to remove the water at the lower contact portion. When the adhesion of dust increases and the passage resistance increases, the water storage valve 14 is closed, water is supplied from the makeup water pipe 9, the water level is raised, the water level is raised to L2 by the water level gauge 15, and then the water storage valve 14 is opened to open the contact material. Drain more water and discharge attached dust with water,
This operation is repeated twice or three times.

[0007] When removing odors mainly by cleaning with a chemical solution, the inside of the water tank is an acidic or alkaline chemical solution. The makeup water pipe requires two sets of medicine and water. The contact material 2 is filled with a 5 m / mφ granular contact material of expanded polystyrene resin. The particle size of the contact material may be changed according to the load and site conditions. Then, the contaminated air is caused to flow in from the air inflow pipe 10, the circulation pump 6 is operated at a low speed, and the medicine is sprayed from the spray nozzle 8. The chemical solution adhering to the surface of the contact material and the odor element in the contaminated air undergo an oxidation reaction or a reduction reaction to remove the odor. The cleaning is performed mainly by the cleaning nozzle described in the preceding section.

[0008]

FIG. 1 is a sectional view of a reactor according to an embodiment of the present invention. A floating prevention plate 3 is provided at the upper part of the inside of the reaction tower 1, and a settlement prevention plate 4 is provided at the lower part, and a granular contact material of expanded polystyrene resin having a specific gravity smaller than 1 is filled as a contact material 2 between them. An air inflow pipe 10 is connected to the lower water storage tank 5, air flows into the contact member 2 through the air chamber 11, and the water storage tank 5 secures a required amount of water by a supply water pipe 9, and is capable of low-speed and high-speed switching. A pump 6 is provided, and water or a chemical is sprayed on the contact member 2 from a spray nozzle 8 via a transfer water pipe 7 and a transfer valve 7a.
The processed air passes through the upper processing air chamber 12 and passes through the duct 17.
Transferred out of the system. The cleaning of the contact material is normally performed by operating the circulation pump 6 at a low speed and using only the spray nozzle 8,
When a large amount of dust or the like is present, high-speed operation is performed and the washing nozzle 8a is also sprayed at the same time to remove dust at the lower part of the contact material. When dust accumulates and the passage resistance rises, the water level of the water storage tank 5 is raised by closing the water storage valve 14 and the water level is set to L2 by the water level gauge 15,
Next, the water storage valve 14 is opened, drained, and dust and the like are flown to wash the contact material.

As the contact material, a foamed polystyrene resin having a diameter of 5 m / m was used as an example. The surface area s of one granular contact material is s = 3.14 × 0.005 m × 0.005 m = the number n n = 200 × 200 × 200 = 8,000,000 total surface area S of the particulate contact material of 0.005m diameter in 0.0000785m ² 1m ³ is S = s × n = 0.0000785 ×
8,000,000 = 628 m ^{2, that} is, 1 m ³ of the reaction tower has a contact material surface area of about 628 m ² , and the specific surface area of a general contact material is approximately 50 m ² / m ^{3 to} 100 m ² /. m ³
Since the contact area is twice to ten times, the contact efficiency is improved. Approximately 28 m ² for a maximum particle size of 35 m / m proposed in the present invention, and approximately 100 m for a maximum particle size of 30 m / m.
² .

[0011]

According to the present invention, the treatment efficiency is excellent for both the deodorization reaction tower and the dust removal reaction tower, and the capacity of the tower is about 30 to 50% of the conventional one.
Energy saving type and economical. Further, the device is simple, the handling of the contact material is easy, and the controllability is excellent.

[Brief description of the drawings]

FIG. 1 is a sectional view of a gas-liquid contact reaction tower.

[Explanation of symbols]

 1 is a reaction tower 2, a contact material 3, a floating prevention material 4, a settlement prevention material 5, a water storage tank 6, a circulating pump 7, a transfer water pipe 7 a, 7 b, a spray valve, a cleaning valve 8, The spray nozzle 8a, the washing nozzle 9, the makeup water pipe 10, the air inflow pipe 11, the air chamber 12, the treatment air chamber 13, the storage water extraction pipe 14, the water storage valve 15, the water level gauges 15a, 15b, Water level detector 16 is a drain valve 17 is an air duct

Claims (3)

[Claims] 1. A contact reaction tower for physicochemically removing contaminated air containing odors, dust, etc., in which an anti-floating material is provided at an upper portion and a subsiding material is provided at a lower portion, and foaming having a specific gravity smaller than 1 is provided in the middle. Filled with granular contact material of polystyrene resin,
Contaminated air flows in from the lower part, water or chemical liquid is sprayed from the upper part by the circulation pump, and gas or liquid contact is made in the reaction tower by counter flow through the contact material in the reaction tower. A gas-liquid contact reaction tower characterized by removing methane. 2. The gas-liquid contact reaction tower according to claim 1, wherein when there is a large amount of dust in the contaminated air, the circulation pump is operated at a high speed, and the dust is sprayed from the water spray nozzle and the washing nozzle. A gas-liquid contact reaction tower characterized by capturing dust and removing it by a water flow while performing gas-liquid contact. 3. The gas-liquid contact reaction tower according to claim 1 or 2, wherein when dust or the like adheres to the contact material and the air passage resistance increases, the water level of the water tank for water circulation is increased. Gas-liquid contact reaction characterized by dissolving the dust on the surface of the contact material into water by raising it to the top, cleaning the contact material while draining at a lower water level, and lowering the air passage resistance to perform gas-liquid contact Tower.