JPS58170520A - Gas pufirication apparatus - Google Patents

Abstract

PURPOSE:To pufiry an exhaust gas having a bad odor simply to a degree free from danger of environmental pollution even if said exhaust gas after treatment is directly discharged to the atmosphere. CONSTITUTION:The gas (a) enters a washing tank 1 from a gas inlet port 6 and is purified through contact with a washing liquid atomized and fallen in said tank 1. The purified gas subsequently enters a second washing apparatus and further purified by contacting the same with the similarily stomized and fallen washing liquid. The purified gas is drawn out from the top part of the washing tank 3 to be introduced into an exhaust tower and discharged to the atmosphere. The washing liquid contacted with the gas is accumulated in a washing liquid tank 10 through drain pipes 4, 4', 4'' and a collecting pipe 5 and precipitative separation of impurities is carried out in this tank. The supernatant liquid is supplied to a spray apparatus 8 from the washing liquid tank 10 through a supply pipe 9 by a pump P and recirculated to be reused in gas purification.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas purification device for purifying gas, particularly gas having a characteristic odor emitted from chemical factories, garbage disposal factories, slaughterhouses, food processing factories, etc. These odors are ammonia, trimethylamine, hydrogen sulfide, methyl sulfide, etc., and these odorous components are mixed to produce a unique odor.

In order to remove these odor components and purify the gas,
Conventionally, water cleaning methods and cleaning methods using chemicals such as acids or alkalis have been used, but sufficient deodorizing effects cannot be expected.
Moreover, when the water washing method is carried out, the used washing water contaminates rivers and underground water due to the strong odor components dissolved therein, especially ammonia, causing secondary pollution.

Further, cleaning methods using acidic or alkaline chemicals are expensive, and cleaning solutions containing products of neutralization or chemical reactions are also a source of secondary pollution. In addition, deodorizing methods have been carried out by passing it through a substance with adsorption ability such as zeolite, but it is impossible to remove all malodorous components with this method. Must be regenerated after use. Although there is a method in which the above-mentioned methods are combined, for example, the gas is passed through an adsorbent material after being pretreated with water, sufficient deodorization cannot be achieved even with this method.

By using the gas purification device according to the present invention, gases having the above-mentioned bad odor can be easily purified to the extent that there is no risk of environmental pollution even if the exhaust gas after treatment is released directly into the atmosphere. be able to.

The present invention relates to a gas purification device for purifying gas, particularly gas having a certain degree of bad odor, which is emitted from chemical plants, garbage processing plants, slaughterhouses, food processing plants, etc. It has a drain pipe at the bottom and several gas cleaning tanks connected in series so that the gas flows sequentially, and the drain pipe opens from above at the bottom of the cleaning tank. The cleaning tank has a spray device at the top to atomize the cleaning liquid, and the other end of the supply pipe plunges into the supernatant liquid layer in the cleaning liquid tank. For example, a suspension of ferrous sulfate, deolite, and pearlite in water was inserted into two stainless steel tubes with Nichrome wire insulated so that the current flowing through the two wires was in different directions. Heat the liquid with an electric heater and apply a magnetic field at the same time to bring the temperature of the liquid to 75-85°C for about 40-45 minutes.
Aluminum sulfate is added as a precipitant, and the supernatant liquid is taken out. For example, a four-person wire is placed coaxially in a porous vinyl chloride tube, and activated carbon particles are filled between the vinyl chloride tube and the chrome wire. The voltage between the electrodes is 0.5-0 at 5-150,000 rt.
．． It is characterized by being a solution obtained by passing a current of 70 amperes.

FIG. 1 shows an embodiment of the apparatus according to the invention, which comprises three cleaning tanks connected in series. The first cleaning device is a cleaning tank 1 with a gas tank 6 at the top left and a cleaning liquid discharge storage at the bottom.
It's okay. The second cleaning device connected to the first cleaning device by a pipe 7 is configured as a unit device in which cleaning tanks 2 and 3 are connected to each other, and the cleaning tanks 2 and 3 are in communication with each other through a gas passage. . Of course, the cleaning tanks 2 and 3 may be independent cleaning tanks. The cleaning tanks 2 and 3 are equipped with drain pipes ◆' and 4' at the bottom, and these wastewater storage e 4' *
Reference numeral 4' indicates a noisy manifold which collects in a collecting pipe 6, and the collecting pipe 6 opens 1° above the cleaning liquid tank. The first and second cleaning devices are equipped with a common cleaning liquid spray device 8 consisting of a tube with a number of nozzle holes in its upper part.

A supply pipe 9 having a pump P is connected to the spray device 8 , and the other end of the supply pipe 9 projects below the liquid level of the cleaning liquid tank 10 .

Gas is input from the left side in the figure to the cleaning tank L with a gas population of 6.
Here, it is atomized and comes into contact with the raining cleaning solution to be purified. The gas then enters the second cleaning device through the pipe 7 and is further purified by coming into contact with the cleaning liquid which is also atomized and rains down. The purified gas is led out from the top of the cleaning tank 3 to the exhaust tower and released into the atmosphere. The cleaning liquid that has come into contact with the gas is transferred to the cleaning liquid tank 10 through wastewater storage e4'e4' and collection t5, where impurities are sedimented and separated. The supernatant liquid is supplied from the cleaning liquid 41I11o to the syspray device 8 through the supply pipe 9 as InzoP, and is circulated and used for gas purification.

If desired, several further cleaning device units can be connected to the cleaning device shown in FIG. 1, and FIG. 2 shows such an embodiment. The first and second cleaning devices in FIG. 2 are the same as in FIG. 1, and corresponding parts are designated by the same reference numerals. However, a third cleaning device is connected to the second cleaning device through the pipe 16, and this third cleaning device is a unit device in which two cleaning tanks 12, 13 are connected to each other. The upper part of the unit device is fitted with a spray device consisting of a tube with a large number of nozzle holes similar to that shown in FIG.
18 are in communication and are provided with a pipe 18Fi, a pump P', and are connected at the other end to a supply pipe 19 immersed in the cleaning liquid tank 15.

The gas enters from the gas port 6 of the first cleaning device, passes through the second cleaning device (2, 3), continues through the pipe 16 and enters the third cleaning device (12, 13), where it is atomized. It is further purified by contact with the cleaning liquid, and is then discharged from the top of the cleaning tank 13 to the exhaust tower 1.
It is discharged at 7. In the third cleaning device, the cleaning liquid atomized by the spray device 18 is transferred to the cleaning tank 13.14.
After coming into contact with the gas passing therein, the drain pipes 14, 14'
The liquid is then discharged and enters the cleaning liquid tank 20 through the collection pipe 15. The supernatant liquid obtained in the cleaning liquid tank 20 is supplied to the spray device 16 by a pump P' via a supply pipe 19, likewise forming a circulation path for the cleaning liquid.

Pumps P and P' can also be replaced by submersible pumps. The cleaning liquid tank 10.20 is charged or replenished with cleaning liquid from a cleaning liquid production device (not shown), regulated by a suitable control device.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the apparatus according to the present invention using three O cleaning tanks, and FIG. 2 is a system diagram showing another embodiment of the apparatus using six cleaning tanks. 1.2.3...Cleaning tank, feeding @ 4' @ 4'...
Drain pipe, 5... Collection pipe, 6... Gas inlet, 7...
Connecting pipe, 8... Spray device, 9... Supply pipe, 1o
...Cleaning liquid tank, 11...Exhaust tower, 12.13...
Cleaning tank, 14.14'... Drain pipe, 15... Collection pipe, 16... Connecting pipe, 17... Exhaust tower, 16... Spray device, 19... Supply pipe, 20 ...Washing liquid tank

Claims (1)

[Claims] A gas cleaning tank with a gas inlet and outlet, a drain pipe at the bottom, and several gas cleaning tanks connected in series so that the gas flows sequentially, with a drain pipe below the cleaning tank. A cleaning liquid tank that opens from above is arranged, the cleaning tank has a spray device on the top for atomizing the cleaning liquid, a supply pipe equipped with a pump is connected to the spray device, and the other end of the supply pipe is connected to the cleaning liquid tank. The washing liquid enters the supernatant liquid layer inside the tank, and at the same time heats the suspension of ferrous sulfate, deolite, and perlite in water with an electric heater, and simultaneously connects the heating wire of the electric heater. A magnetic field generated by a flowing current is applied to lower the temperature of the liquid to approximately 40 to 40
The temperature was heated to 75 to 86°C for 5 minutes, aluminum sulfate was added as a precipitant, and the liquid was taken out and the voltage was 5 to 150,000 rut.
．． A gas purification device characterized in that it is purified by a solution obtained by passing a current of 5 to 0.7 tlJ ampere.