JPH08327790A - Waste gas scrubbing device in glass melting furnace - Google Patents

Abstract

PURPOSE: To prevent the generation of choking phenomenon in transporting duct in a waste gas scrubbing device in a glass melting furnace by suppressing the deposition of dust and mist, etc., contained in waste gas and raise capability of separation and recovery of the dust and mist by reducing the radiation dose in the off-gas transporting duct. CONSTITUTION: Provided are a scrubbing pot 11 connected to a off-gas exhaust pipe 4 and a shower 13 discharging scrubbing liquid arranged in the upper position inside the scrubbing pot. Also provided are a waste liquid scrubbing means 14 which is connected to the inside of the scrubbing pot 11 wherein the scrubbing liquid containing dust and mist is flowed down, and an off-gas processing system 15 for processing the passed waste gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste gas cleaning device in a glass melting furnace, and more particularly to suppressing the phenomenon in which dust contained in off-gas discharged from the glass melting furnace adheres to a pipeline. Is.

[0002]

2. Description of the Related Art As a technical example for preventing dust and mist contained in off-gas in a glass melting furnace, Japanese Utility Model Laid-Open No. 146996/1987 "glass melting furnace" has been proposed. In this technical example, as shown in FIG. 2, the off-gas generated by melting the waste liquid and the glass material by the glass melting furnace 3 housed in the airtight chamber 2 of the cell 1 is sucked into the off-gas discharge pipe 4 and the off-gas suction pipe. The air curtain 6 is formed on the inner surface of the off-gas discharge pipe 4 to prevent dust and mist from adhering when the gas is sucked and discharged by the system 5.

[0003]

However, if the air curtain 6 is formed so as to extend over the entire length of the off-gas discharge pipe 4,
The consumption of air or the like for forming the air curtain 6 becomes large, and the apparent total amount of off-gas treatment is significantly increased, which makes the treatment difficult. When the length of the air curtain 6 is shortened, dust, mist, or the like is accumulated in the off-gas discharge pipe 4, and the radiation amount at that portion increases.

The present invention has been made in view of the above circumstances and achieves the following objects. Suppress the accumulation of dust and mist to prevent the off-gas transfer pipeline from blocking. Reduce the radiation dose in off-gas transfer lines. Improve the separation and recovery of dust and mist.

[0005]

A device for cleaning waste gas discharged from a glass melting furnace during transfer, the cleaning pot being connected to an off-gas discharge pipe of the glass melting furnace, and an upper part of the inside of the cleaning pot. A shower arranged at a position for ejecting the cleaning liquid sent from the cleaning liquid transfer means, a waste gas cleaning means connected to the inside of the cleaning pot for flowing down the cleaning liquid containing dust, mist, etc., and connected to the waste gas cleaning means. A technique including an off-gas treatment system that treats the waste gas that has passed through is adopted. Between the cleaning pot and the waste gas cleaning means, a downflow pipe line for flowing down the cleaning liquid containing dust, mist and the like is arranged in an inclined state. The cleaning liquid transfer means employs a technique having a pressurized air supply system for supplying pressurized air and an air lift pump connected to the pressurized air supply system and operated by the supply of pressurized air. A liquid purification system that removes impurities and the like from the overflowed cleaning liquid to purify it is connected to the waste gas cleaning means. A cleaning liquid supply system for supplying a cleaning liquid is arranged in the waste gas cleaning means, and the cleaning liquid supply system is arranged between the liquid purification system and the waste gas cleaning means.

[0006]

The waste gas generated by the operation of the glass melting furnace is guided to the cleaning pot via the off-gas discharge pipe.
The waste gas sent to the cleaning pot comes into contact with the spray liquid sent by the operation of the cleaning liquid transfer means such as an air lift pump to be cleaned, and the dust, mist, etc. contained in the waste gas are washed away. Dust, mist and the like that have been washed away are caused to flow down to the waste gas cleaning means by the inclined flow-down conduit together with the cleaning liquid, and are taken into the stored cleaning liquid. Since the cleaning liquid is flowing down inside the flow-down conduit, dust and mist are washed away without being accumulated. The waste gas that has passed through the waste gas cleaning means is sent to the off-gas processing system and processed as off-gas.
In addition, the cleaning liquid component flowing out from the waste gas cleaning means is processed by the liquid purification system.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a waste gas cleaning device in a glass melting furnace according to the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 7 is a waste liquid supply system, 8 is a glass raw material supply system, 11 is a cleaning pot, 12 is a cleaning liquid transfer means, 13 is a shower, 14 is a waste gas cleaning means, 15 is an off-gas treatment system, and 16 is a downflow pipe. Reference numeral 17 is a liquid purification system, 18 is a cleaning liquid supply system, and R is a cleaning liquid.

A waste liquid supply system 7 and a glass raw material supply system 8 are connected to the glass melting furnace 3, and an offgas discharge pipe 4 is arranged at a waste gas outlet 3a. As shown in FIG. 1, the off-gas discharge pipe 4 and the waste gas outlet 3a are provided in an upright state and, if necessary, an air curtain 6
Are arranged.

The cleaning pot 11 is provided with the off gas discharge pipe 4
The cleaning liquid transfer means 12 and the flow-down conduit 16 are disposed in an intervening state, and the shower 13 is disposed inside the cleaning pot 11.

The cleaning liquid transfer means 12 is arranged in a connected state between the inside of the waste gas cleaning means 14 and the shower 13, and a pressurized air supply system 12a such as a blower or a compressor for supplying pressurized air, The pressurized air supply system 12a
Connected to the air lift pump 12b that operates by the supply of pressurized air to transfer the cleaning liquid R to the shower 13, a pressurized air supply pipe 12c that connects between the pressurized air supply system 12a and the air lift pump 12b, and an air lift pump. 1
Cleaning liquid supply pipe 12 connecting between 2b and shower 13
Those with d and apply.

The shower 13 is arranged above the inside of the cleaning pot 11, and sprays the cleaning liquid R fed from the cleaning liquid transfer means 12 downward in a shower shape or a spray shape via, for example, the perforated plate 13a. The cleaning liquid is brought into contact with the waste gas, and the volatile components, dust components and mist components contained in the waste gas are taken into the cleaning liquid.

The waste gas cleaning means 14 is disposed between the off-gas processing system 15 and the flow-down conduit 16, and is provided with a storage tank 14a for storing the cleaning liquid R, and the storage tank 14
a downward pipe 14b disposed in a state of being immersed in the cleaning liquid R and flowing down the cleaning liquid R containing dust, mist and the like, and a waste pipe discharging a waste gas, and a suspension pipe 14b disposed around the suspension pipe 14b. The cleaning unit R has a condensing unit 14c for cleaning the waste gas, such as contacting a gas component rising in the cleaning liquid R with the cleaning liquid R to condense and collect volatile components.
For the condensing unit 14c, one having a metal mesh layer that bends and disperses the flow path of the rising gas to enhance contact with the cleaning liquid is applied.

The off-gas processing system 15 is connected to the waste gas cleaning means 14 and processes the waste gas that has passed through the cleaning state as off gas.

The flow-down conduit 16 is disposed between the cleaning pot 11 and the waste gas cleaning means 14 in an inclined state in which the downstream side is at a downward position, transfers waste gas, and contains dust, mist and the like. The cleaning liquid R to be used is made to flow down using an inclination.

The liquid purification system 17 includes a waste gas cleaning means 14
In the storage tank 14a in a connected state, the cleaning liquid R is caused to flow down (overflow), and the liquid level RL
Is used, which has a function of holding impurities at a constant position and removing impurities from the overflowed cleaning liquid R to purify the cleaning liquid R. The liquid cleaning system 17 is connected to a cleaning liquid supply system 18 for supplying or replenishing the cleaning liquid R to the storage tank 14a in the waste gas cleaning means 14, and recirculates the cleaned cleaning liquid R as necessary. I am trying.

In the waste gas cleaning device having such a configuration, the waste gas generated by the operation of the glass melting furnace 3 is passed from the waste gas outlet 3a to the cleaning pot 11 via the off gas discharge pipe 4. Sent in. Off-gas exhaust pipe 4
In the interior of the waste gas, due to the formation of the air curtain 6 and the short pipeline, the temperature of the waste gas is unlikely to drop, and the waste gas is sent to the cleaning pot 11 in a high temperature state, The dust, volatile components, mist and the like of the above are prevented from adhering to the inner surface of the pipeline.

The waste gas sent to the cleaning pot 11 is
Since the dust and mist contained in the waste gas are washed away by contacting with the jetting liquid of the washing liquid R sent by the operation of the washing liquid transfer means 12, the washing liquid R including the washed dust and mist flows down. It is sent to the inside of the storage tank 14a in the waste gas cleaning means 14 by the pipe line 16. In the inside of the cleaning pot 11, the temperature of the waste gas is cooled by the jetting of the cleaning liquid R in a low temperature and the temperature is rapidly lowered, and dust or mist in the waste gas is taken into the cleaning liquid R as it is. The volatile components become condensed liquid and are similarly taken into the cleaning liquid R.

Therefore, the down-flowing line 16 is transferred in a state where the down-flowing liquid containing dust and the like and the gas component are mixed, and the down-flowing liquid is prevented from accumulating on the way together with the setting of the inclination. It is made to flow down with it and sent to the waste gas cleaning means 14.

In the waste gas cleaning means 14, the waste gas and the falling liquid are discharged into the cleaning liquid R from the lower opening of the hanging pipe 14b, and the falling liquid is taken into the cleaning liquid R in a mixed state. The discharged waste gas is condensed part 1
By passing through 4c, the contact between the waste gas and the cleaning liquid R is enhanced, and dust, volatile components, mist, etc. in the waste gas are repeatedly taken into the cleaning liquid R.

Storage tank 14a in the waste gas cleaning means 14
The cleaning liquid R is supplied to the shower 13 inside the cleaning pot 11 by the operation of the air lift pump 12b in the cleaning liquid transfer means 12. At this time, the air lift pump 1
If 2b is applied, the occurrence of failure is reduced because there is no mechanically movable part, but the gas-liquid mixed fluid is sent from the cleaning liquid supply pipe 12d to the shower 13 as it is. In that case, spraying is performed by jetting the gas-liquid mixed fluid.

Condensing part 14c in the waste gas cleaning means 14
The waste gas that has passed through is condensed by a temperature drop by increasing the contact with the cleaning liquid R in the condensing unit 14c, and volatile components, mist, and the like are repeatedly collected, and become only gas components to form an off-gas treatment system. It is sent to 15 and processed as off gas. At this time, the cleaning liquid R purified by the liquid cleaning system 17 is supplied to the cleaning liquid supply system 18 if necessary.
It is returned to and recycled.

The storage tank 14a in the waste gas cleaning means 14 is supplied by supplying volatile components and mist in the waste gas.
When the liquid level RL of No. 2 rises, the overflowed outflow is processed by the liquid purification system 17.

[0023]

As described above, the waste gas cleaning device for a glass melting furnace according to the present invention has the following effects. (1) The waste gas of the glass melting furnace is fed into the cleaning pot to be brought into contact with the cleaning liquid ejected from the shower for cleaning, and the cleaning of the waste gas cleaning means is added to prevent the accumulation of dust or mist. It is possible to suppress the occurrence of the blockage phenomenon of the entire off-gas transfer pipeline. (2) The amount of radiation in the off-gas transfer pipeline can be reduced by cleaning the waste gas during transfer. (3) By removing the waste gas by washing and removing it in the middle of the transfer path, it is possible to prevent a deposition phenomenon from occurring downstream,
The effect of reducing the radiation dose can be enhanced. (4) The cleaning liquid containing dust and mist, etc. is sent into the stored liquid of the waste gas cleaning means along with the gas component in the inclined flow-down conduit to enhance the separation and recovery property from the gas component in the dust, mist, etc. You can (5) By operating the cleaning liquid transfer means with an air lift pump, it is possible to reduce the occurrence of failures and improve the soundness of the waste gas cleaning device that handles radioactive substances.

[Brief description of drawings]

FIG. 1 is a connection diagram showing an embodiment of a waste gas cleaning device in a glass melting furnace according to the present invention.

FIG. 2 is a front sectional view showing a schematic example of a vitrification facility.

[Explanation of symbols]

 3 Glass Melting Furnace 4 Off Gas Discharge Pipe 6 Air Curtain 11 Cleaning Pot 12 Cleaning Liquid Transfer Means 12a Pressurized Air Supply System 12b Air Lift Pump 12c Pressurized Air Supply Pipe 12d Cleaning Liquid Supply Pipe 13 Shower 14 Waste Gas Cleaning Means 14a Storage Tank 15 Off Gas Treatment System 16 Downstream line 17 Liquid purification system 18 Cleaning liquid supply system R Cleaning liquid RL Liquid level

Claims (4)

[Claims] 1. A device for cleaning waste gas discharged from a glass melting furnace (3) during transfer, which is a cleaning pot (11) connected to an off-gas discharge pipe (4) of the glass melting furnace.
A shower (13) arranged above the inside of the cleaning pot and ejecting the cleaning liquid (R) fed from the cleaning liquid transfer means (12); and a cleaning liquid connected to the inside of the cleaning pot and containing dust, mist, etc. A waste gas cleaning device in a glass melting furnace, comprising: a waste gas cleaning means (14) that is made to flow down; and an off-gas processing system (15) that is connected to the waste gas cleaning means and that processes the waste gas that has passed through. . 2. A flow-down pipe line (16) for allowing a cleaning liquid (R) containing dust, mist, etc. to flow down, is arranged in an inclined state between the cleaning pot (11) and the waste gas cleaning means (14). The waste gas cleaning device in a glass melting furnace according to claim 1, characterized in that. 3. The cleaning liquid transfer means (12) comprises a pressurized air supply system (12a) and an air lift pump (12b) connected to the pressurized air supply system and operated by supplying pressurized air.
The waste gas cleaning device in the glass melting furnace according to claim 1 or 2, further comprising: 4. The liquid purification system (17) for removing impurities and the like from the overflowed cleaning liquid (R) and purifying the waste gas cleaning device (14) is connected to the waste gas cleaning means (14). 2. The waste gas cleaning device in the glass melting furnace according to 2 or 3.