JP2002102637A - Flue gas cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flue gas cleaning apparatus which can sufficiently clean a flue gas though the flue gas is subjected to gas-liquid contact with stored water in a short tower, can sufficiently agitate the stored water with the flue gas passing through the water, and can prolong the gas-liquid contact time. SOLUTION: This cleaning apparatus has a flue gas introduction chamber 11 and a gas suction chamber 12 connected to an exhaust means 4, these chambers being formed by partitioning the upper part of a tank 10 for storing water. The level of water stored at the side of the gas introduction chamber 11 is set so as to be higher than the lower end 15a of the partition plate before has sucking and lower than the lower end 15a during gas sucking. The tank 10 has an upper side guide plate 16 continuously extending from the partition plate 15 toward the gas suction chamber 12 and an under side guide plate 17 extending from a position lower than the lower end 15a of the partition plate to the gas suction chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas cleaning apparatus for cleaning exhaust gas discharged from an incinerator, various types of combustion equipment, and the like.

[0002]

2. Description of the Related Art A conventionally known exhaust gas cleaning apparatus cleans water by showering cleaning water or a chemical solution and bringing exhaust gas into contact with the inside of an airtight ventilation pipe, or washing exhaust gas in a tray stored water. It is aerated and cleaned. Further, there is also known an apparatus for cleaning exhaust gas by making gas-liquid contact through a filler.

[0003]

However, the known exhaust gas cleaning apparatus cleans the exhaust gas with a limited amount of stored water. Therefore, in order to bring the exhaust gas and the stored water into sufficient gas-liquid contact, the gas-liquid There was a problem that the contact time had to be increased by enlarging the contact tower. Furthermore, in a conventionally known exhaust gas cleaning apparatus that circulates and showers stored water, the temperature of the stored water rises to 70 to 80 ° C., and due to the rise in the temperature of the stored water, absorption of harmful components in the exhaust gas is poor. Therefore, there is a problem that a large amount of steam accompanies the exhaust. The present invention has been made in view of these problems, and an object of the present invention is to provide an exhaust gas cleaning apparatus capable of sufficiently performing exhaust gas cleaning despite the fact that exhaust gas is brought into gas-liquid contact with stored water in a short tower. Is to provide. Another subject of the present invention is:
It is an object of the present invention to provide an exhaust gas cleaning apparatus capable of sufficiently agitating the stored water by the exhaust gas itself passing through the stored water and increasing the gas-liquid contact time. Another object of the present invention is to provide an exhaust gas cleaning device that can cool stored water, increase the absorption of harmful components in exhaust gas, and reduce the amount of steam accompanying exhaust gas.

[0004]

An exhaust gas cleaning apparatus according to the present invention for solving the above problems is an exhaust gas cleaning apparatus for cleaning exhaust gas discharged from an incinerator or the like, wherein the exhaust gas cleaning apparatus stores water. A tank having a gas introduction chamber into which the exhaust gas is introduced and a gas suction chamber connected to an exhaust unit, and the gas introduction chamber and the gas suction chamber are provided at an upper portion of the tank. Partitioned from the plate is separated from each other, so that the level of the stored water on the gas introduction chamber side is above the lower end of the partition plate before gas suction and lower than the lower end of the partition plate during gas suction. The tank has an upper surface guide plate extending continuously from the partition plate in the gas suction chamber side, and a lower surface guide plate extending in a gas suction chamber side direction from a position further below the lower end of the partition plate. , The top surface guide plate and / or bottom guide plate has a wave stand plate which projects between them,
It is characterized by the following.

[0005] In a preferred embodiment of the exhaust gas cleaning device, it is appropriate to form an uneven cut at the lower end of the partition plate and / or the tip of the corrugated plate.
Suitably, the upper surface guide plate is provided substantially horizontally, and the lower surface guide plate is suitably provided to be inclined upward.
The lower guide plate of the exhaust gas cleaning apparatus has an upwardly inclined portion extending above the water surface of the gas suction chamber beyond the length of the upper guide plate, and the inclined portion is located near the water surface of the gas suction chamber. It is appropriate to have a washing water passage at the position of. Further, the gas introduction chamber of the exhaust gas cleaning device is suitably connected to an air introduction port provided with a damper, and the tank is provided with a water level detector for detecting a water level in the tank, and a water level detector for detecting the water level. It is appropriate to have a water supply control valve for adjusting the water level in the tank based on the signal from the vessel.
Further, the tank of the exhaust gas cleaning device has a drain pipe for draining the oil floating on the water surface of the gas suction chamber, and the drain pipe has a position of an opening through which oil flows in a position of an interface between oil and water. It is appropriate to have a regulator that can be adjusted, and furthermore, the tank has a device for adding a neutralizing solution to the stored water, or water containing dust that precipitates and floats at the bottom of the tank is supplied to the combustion furnace. Suitably, it has a pump means for feeding.

[0006]

When the gas in the gas suction chamber is exhausted by the exhaust means, the gas suction chamber becomes negative pressure, so that a pressure difference is generated between the gas introduction chamber and the gas suction chamber which are separated from each other by the partition plate. The gas introduction chamber and the gas suction chamber are separated from each other by a partition plate, and communicate with each other below the water surface because there is no partition below the lower end of the partition plate. Therefore, when a pressure difference occurs between the gas introduction chamber and the gas suction chamber,
The stored water on the gas introduction chamber side is pushed down, moves to the gas suction chamber side through the lower end of the partition plate, and the water level on the gas introduction chamber side falls. Then, when the gas in the gas suction chamber is exhausted and the level of the stored water on the gas introduction chamber side falls below the lower end of the partition plate, the exhaust gas introduced into the gas introduction chamber flows from the lower end of the partition plate into the gas suction chamber. The stored water is extruded to the side and is lifted by being lifted up by the stored water while being guided by the upper surface guide plate and the lower surface guide plate having the corrugated plate, and splashes into the gas suction chamber as a torrent.

[0007] In the exhaust gas cleaning apparatus of the present invention, the exhaust gas passing through the stored water in the process of being pushed out through the lower end of the partition plate toward the gas suction chamber and rising while being guided by the upper surface guide plate and the lower surface guide plate. Since sufficient stirring can be performed on the stored water by the gas itself, the stirring can make the exhaust gas into fine bubbles or the stored water into water droplets, thereby allowing the exhaust gas and the stored water to come into sufficient gas-liquid contact, The time of gas-liquid contact can also be lengthened. When the cuts of the unevenness are formed in the lower end of the partition plate and / or the corrugated plate, the exhaust gas and the stored water can be more sufficiently stirred. Further, when the upper surface guide plate is provided substantially horizontally and the lower surface guide plate is provided inclined upward, the exhaust gas and the stored water pushed out to the gas suction chamber side together with the stored water through the lower end of the partition plate can be appropriately formed. Can be induced, and the gas-liquid contact effect is further enhanced.

The stored water, which has been pushed out to the gas suction chamber side together with the exhaust gas through the lower end of the partition plate, flows below the lower surface guide plate through the washing water passage opening provided in the inclined portion of the lower surface guide plate. It circulates to the gas introduction chamber side through a water channel established below the guide plate. In addition, if the damper connected to the air inlet is adjusted to mix the air with the exhaust gas in the gas introduction chamber, the stored water can be cooled, thereby increasing the absorption of harmful components in the exhaust gas and entraining the exhaust gas. The generated steam is captured in the stored water by cooling and condensing, and the amount of supersaturated steam released to the atmosphere can be reduced. The water stored in the tank is reduced by steam and splashes accompanying the exhaust, but the water level is always detected by a water level detector, and the water level is appropriately controlled by a water supply control valve that adjusts the water level in the tank based on a signal from the water level detector. Water level is adjusted.

The oily dust in the exhaust gas can be efficiently captured by floating viscous oil on the storage surface of the gas suction chamber, but the oil that has captured the oily dust is located in the opening through which the oil flows. It is withdrawn by a withdrawal tube having an adjuster whose position can be adjusted to the position of the oil-water interface. Further, in order to further enhance the cleaning effect of the exhaust gas, a neutralizing solution is added to the stored water from an adding device provided in the tank. Dust adsorbed to the stored water by the exhaust gas washing becomes a dust suspension that precipitates and floats at the bottom of the tank, and the dust suspension is sent little by little to an incinerator by a pump provided in the tank. Is incinerated by being sprayed into the incinerator.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the exhaust gas cleaning apparatus according to the present invention. The exhaust gas cleaning apparatus 1 has a tank 10 for storing the cleaning water 2, the tank 10 is a container surrounded by a top plate 10 a, a side plate 10 b, and a bottom plate 10 c, and gas is introduced into an upper portion of the tank 10. It has a chamber 11 and a gas suction chamber 12, and the gas introduction chamber 11 and the gas suction chamber 1
2 is connected to a gas inlet 13 and a gas outlet 14 projecting upward from the top plate 10a of the tank 10, and exhaust gas discharged from an incinerator or the like is connected to the gas inlet 13 via an exhaust gas supply pipe 3. The gas outlet 14 is connected to the suction fan 4 via the suction pipe 5, and the exhaust gas that has been cleaned by driving the suction fan 4 is discharged. A gas-liquid contactor 35 is provided in the gas inlet 13, and the gas-liquid contactor 35 has a plurality of pipes (not shown) having a plurality of spray means. The pump is connected to a pump (not shown) for supplying the stored water, and the stored water is sprayed to exhaust gas discharged from an incinerator or the like through the pipe. Therefore, exhaust gas discharged from incinerators, etc.
After the gas-liquid contact in the short gas-liquid contact tower having the gas-liquid contactor 35, the gas flows into the gas introduction chamber 11. The gas outlet 14 is provided with a plurality of water droplet collision plates 36 for collecting water droplets in the exhaust gas. The suction fan 4 has a drive motor whose rotation speed can be controlled and a damper (not shown) provided at an exhaust port of the suction fan 4 and whose opening can be controlled. Can be controlled.

The gas introduction chamber 11 and the gas suction chamber 12
Are separated from each other by a partition plate 15 hanging down from the top plate 10a of the tank 10, and communicate with each other below the water surface because there is no partition below the lower end 15a of the partition plate 15. Before the gas suction, the water level of the stored water on the gas introduction chamber 11 side is the same as the water level on the gas suction chamber 12 side and above the lower end 15a of the partition plate 15 (the water level indicated by P in FIG. 1). When the exhaust gas is sucked by driving the suction fan 4, the water level is lowered by the suction of the gas, and the partition plate 15 is provided so as to be lower than the lower end 15a (the water level indicated by Q in FIG. 1). Further, both ends and the upper end of the partition plate 15 are air-tightly fixed to both side plates 10b and the top plate 10a of the tank 10 by welding or the like. The tank 10 is provided with an upper surface guide plate 16 extending substantially horizontally above the partition plate 15 in the direction of the gas suction chamber 12 above the lower end 15a of the partition plate 15;
5 has a lower surface guide plate 17 which extends obliquely upward in the direction of the gas suction chamber 12 from a position further below the lower end 15a, and the lower surface guide plate 17 has a plurality of undulating plates 17a standing on the upper surface thereof at appropriate intervals. The upper surface guide plate 16 has a corrugated plate 16a hanging at its tip.

An uneven portion 15b is formed on the lower edge of the partition plate 15.
(See FIG. 2).
A similar concavo-convex portion may be cut out and formed at the tips of a and 17a. When the concave and convex portions 15b are cut out on the lower edge of the partition plate 15, the stored water can flow through the concave cutouts of the partition plate. The lower end is the upper end of the concave cutout of the uneven portion 15b of the partition plate 15. Therefore,
In the case where the concave and convex portions 15b are cut out at the lower edge of the partition plate 15, the water level P of the stored water on the gas introduction chamber 11 side before the gas suction is at least the concave notch of the partition plate 15. Provided above the upper end, the upper surface guide plate 16
At least a portion of the partition plate 15 above the upper end of the concave cutout extends toward the gas suction chamber 12.
Further, the distance between the lower surface guide plate 17 and the lower end of the partition plate 15 is desirably about twice as large as the notch size of the uneven portion of the partition plate 15. Further, the lower guide plate 17 is further inclined at a steep angle at a portion where the inclined portion inclined upwardly exceeds the length of the upper guide plate sufficiently, and the portion 17b inclined at the steep angle is a gas suction portion. Extending above the surface of the room,
A storage water passage 17c is provided at a position near the water surface of the gas suction chamber of the inclined portion 17b, specifically, just above the water surface when the exhaust gas cleaning device 1 is not operating.

The gas introduction chamber 11 and the gas suction chamber 12 are separated from each other by a partition plate 15, and since there is no partition below the lower end 15a of the partition plate 15, they communicate with each other below the water surface. When the device 1 is not operating, the water level of the stored water 2 in the gas introduction chamber 11 and the gas suction chamber 12 is lower than the lower end 1 of the partition plate 15.
At the same water level above 5a. The operation of the exhaust gas cleaning device 1 is started, and exhaust gas is introduced into the gas introduction chamber 11,
When the gas in the gas suction chamber 12 is exhausted by the suction fan 4, the gas suction chamber 12 has a negative pressure, and a pressure difference is generated between the gas introduction chamber 11 and the gas suction chamber 12 partitioned by the partition plate 15. Then, the stored water 2 on the gas introduction chamber 11 side is pushed down, moves to the gas suction chamber 12 side through the lower end 15a of the partition plate 15, and the water level of the stored water on the gas introduction chamber 11 side falls.

When the gas in the gas suction chamber 12 is exhausted and the level of the stored water on the gas introduction chamber 11 side falls below the lower end 15a of the partition plate 15, the gas introduction chamber 11
The exhaust gas introduced into the chamber is pushed out from the lower end 15a of the partition plate 15 toward the gas suction chamber 12, is guided by the upper surface guide plate 16 and the lower surface guide plate 17 having a plurality of corrugated plates 17a, and is stirred and mixed. Then, the stored water is lifted up by being scooped up, and splashes into the gas suction chamber 12 as a torrent. In the exhaust gas cleaning apparatus 1, the exhaust gas is pushed out to the gas suction chamber side 12 through the lower end 15a of the partition plate 15, and is guided by the lower surface guide plate 17 having the upper surface guide plate 16 and the plurality of corrugated plates 17a. In the process of rising while being
Since the exhaust gas itself passing through the stored water itself can sufficiently agitate the stored water, the agitation turns the exhaust gas into fine bubbles or makes the stored water droplets to sufficiently separate the exhaust gas and the stored water from the gas. Contact can be made, and the time of gas-liquid contact can be prolonged.

The harmful substances in the exhaust gas can be dissolved in the stored water and removed by efficient stirring with the stored water in the tank. Further, in the exhaust gas cleaning device 1, the chemical injector 34 having the injection amount adjusting mechanism is connected to the tank 10.
A chemical substance that easily absorbs harmful substances in the exhaust gas and an alkaline solution for neutralization are added to the stored water by the chemical injector 34 to enhance the cleaning effect of the exhaust gas, and the acid treatment is performed by the exhaust gas treatment. Neutralizing the circulating stored water, which is becoming liquefied, enhances the effect of absorbing harmful components in the exhaust gas. The lower end 15a of the partition plate 15 and / or the wavy plate 16a,
When the cuts of the irregularities are formed in 17a, the exhaust gas and the stored water can be more sufficiently stirred. Further, the upper surface guide plate 16 is provided substantially horizontally, and the lower surface guide plate 1 is provided.
When 7 is inclined upward, a wave-return effect is exhibited, the stirring effect is enhanced, and the gas-liquid contact effect is further increased. Partition plate 15
Water pushed out to the gas suction chamber 12 side together with the exhaust gas through the lower end 15a of the lower surface guide plate 17 passes through a stored water passage opening 17c provided in the inclined portion of the lower surface guide plate 17, hits the side plate 10b, and gas is introduced into the bottom of the tank. Circulates to the chamber 11 side to make the properties and temperature of the water stored in the tank uniform.

In addition, the viscous oil is floated on the storage water surface on the side of the gas suction chamber 12 partitioned by the partition plate 15, and the oily soot and dust in the exhaust gas is efficiently captured by bringing the oil into gas-liquid contact with the stirring of the water. can do. In this case, in order to extract the oil 31 floating on the stored water, the suction fan 4
The extraction pipe 32 provided with the adjuster 32a capable of setting the position of the oil-water interface at the time of stoppage as the opening position is connected to the tank 1
Start up from below 0. The lower end of the extraction pipe 32 is connected to a valve 33 outside the tank 10 so that the oil 31 can be extracted when the oil 31 becomes dirty. The adjuster 32a has an opening into its peripheral wall through which oil flows, and is provided on the outer periphery of the upper end of the extraction pipe 32 so that the position of the opening can be adjusted to the position of the interface between oil and water when the suction fan 4 is stopped. The support arm 32b is fixed to the adjuster 32a, and the support arm 32b is rotatably screwed to a socket 32c provided on the top plate 10a of the tank 10. Then, the adjuster 32a is rotated by turning a handle 32d provided at the upper end of the support arm 32b, and the adjuster 32a is pulled out of the pipe 32.
The suction fan 4 is moved up and down by being screwed or screwed into the opening, so that the position of the opening through which the oil flows in is adjusted to the position of the oil-water interface when the suction fan 4 is stopped.

The top plate 10a of the gas introduction chamber 11 is connected to an air introduction port 22 provided with a damper 21 close to the partition plate 15. When the atmosphere is mixed with the exhaust gas passing through the lower end of the partition plate 15, the temperature of the stored water 2 can be lowered during the gas-liquid contact, so that the absorption of harmful components in the exhaust gas is increased, and the steam accompanying the exhaust gas is increased. Can be reduced. The tank 10 includes a water level detector 23 for detecting a water level in the tank 10, and a water supply control valve 2 for adjusting the water level in the tank 10 based on a signal from the water level detector 23.
Four. The water level detector 23 includes two upper and lower water pipes 2 that are attached through the side plate 10 b of the tank 10.
Attach a non-conductive tube 23c to each of the tubes 3a and 23b.
3c, a conductive float 23d is placed in the tube 23c.
An annular magnetic detector 23e for detecting the position of the float 23d is provided at two intervals above and below the float, and the upper surface of the magnetic detector 23e is a liquid level position at the time of stop, and a lower surface is the liquid level at the time of operation. It is provided so that it may become a position. The water supply control valve 24 adjusts the water level in the tank 10 based on a signal from the water level detector 23, and stably replenishes the stored water evaporated by exhaust gas cleaning.

[0018]

EXAMPLE An exhaust gas from an incinerator is introduced into an exhaust gas inlet 13 of the exhaust gas cleaning apparatus 1, and the exhaust gas is sprayed with stored water by a gas-liquid contactor 35 provided at the exhaust gas inlet 13; The exhaust gas was caused to flow into the gas introduction chamber 11. The gas discharge port 14 fitted with a plurality of droplet collision plate 36, the static pressure 80 mm, was connected a suction port of the turbo blower 4 per minute 80 m ^3. When the turbo blower 4 was operated, the water level of the partition plate 15 was lowered by about 60 mm, and the flow of the gas that was scattered from the partition plate 15 to the gas suction chamber 12 to be splashed and torrent was confirmed from the viewing window. 2 for stored water
m ³ , the introduced exhaust gas was 380 ° C., and 40 m ³ of outside air was sucked in with respect to the exhaust gas suction amount of 40 m ³ per minute.
The temperature of the stored water is 57 ℃ and the temperature of the exhaust gas is 56 ℃
And stable.

From this, it was confirmed that the stored water in the tank 10 was cooled by the outside air. Only a slight release of steam was observed from the outlet of the turbo blower 4. Almost no black smoke emitted from the chimney of the incinerator was recognized, and it was confirmed only instantaneously after the incineration (used tires) was charged. When the operation was stopped and the oil floating on the surface of the water was inspected, it was confirmed that the oil was completely black and was contaminated with carbon, and that black smoke dust was adsorbed. 0.1% or less surfactant was added to the stored water. The sample obtained from the water level at the bottom of the stored water was a suspension of fine dust and dust, indicating that the gas-liquid contact was sufficiently performed, and it was confirmed that the purification effect of the exhaust gas was improved. The results of dioxin analysis of atmospheric release were 1.7-3.0 ng, TE
Q / m ³ N, and 5.0 ng of TEQ / m ³
N was able to be cleared.

[0020]

As described above in detail, the exhaust gas cleaning apparatus of the present invention can sufficiently clean the exhaust gas even though the exhaust gas is brought into gas-liquid contact with the stored water in a short tower. Further, the exhaust gas cleaning apparatus of the present invention can sufficiently agitate the stored water by the exhaust gas itself passing through the stored water, can increase the gas-liquid contact time, and can cool the stored water. To increase the absorption of harmful components in the exhaust gas,
Steam accompanying the exhaust gas can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an exhaust gas cleaning apparatus of the present invention.

FIG. 2 is a partial cross-sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust gas cleaning apparatus 2 Reservoir 4 Exhaust means 10 Tank 11 Gas introduction chamber 12 Gas suction chamber 15 Partition plate 15a Lower end of partition plate 16 Upper surface guide plate 17 Lower surface guide plate

Claims (9)

[Claims] 1. An exhaust gas cleaning apparatus for cleaning exhaust gas discharged from an incinerator or the like, wherein the exhaust gas cleaning apparatus has a tank for storing water, and the tank has an upper portion into which the exhaust gas is introduced. A gas suction chamber connected to a gas introduction chamber and an exhaust unit, wherein the gas introduction chamber and the gas suction chamber are separated from each other by a partition plate hanging down from a top plate of the tank; The water level of the stored water is provided so as to be higher than the lower end of the partition plate before gas suction and to be lower than the lower end of the partition plate during gas suction. The tank is continuously connected to the gas suction chamber from the partition plate. A lower surface guide plate extending in a direction toward the gas suction chamber from a position further below the lower end of the partition plate, and the upper surface guide plate and / or the lower surface guide plate protrude therebetween. And a vertical plate, the exhaust gas cleaning apparatus characterized by. 2. The exhaust gas cleaning apparatus according to claim 1, wherein an uneven cut is formed at a lower end of the partition plate and / or a tip of the corrugated plate. 3. The exhaust gas cleaning apparatus according to claim 1, wherein the upper surface guide plate is provided substantially horizontally, and the lower surface guide plate is provided to be inclined upward. Exhaust gas cleaning equipment. 4. The exhaust gas cleaning apparatus according to claim 3, wherein the lower guide plate has an upwardly inclined portion extending above the water surface of the gas suction chamber beyond the length of the upper guide plate. The exhaust gas cleaning apparatus, wherein the inclined portion has a cleaning water passage port at a position near a water surface of the gas suction chamber. 5. The exhaust gas cleaning apparatus according to claim 1, wherein the gas introduction chamber is connected to an air introduction port provided with a damper. . 6. The exhaust gas cleaning device according to claim 1, wherein the tank is a water level detector that detects a water level in the tank.
And a water supply control valve for adjusting a water level in the tank based on a signal from the water level detector. 7. The exhaust gas cleaning apparatus according to claim 1, wherein the tank has a drain pipe for draining oil floating on the water surface of the gas suction chamber. An exhaust gas cleaning device comprising an adjuster capable of adjusting a position of an opening through which oil flows into an interface between oil and water. 8. The exhaust gas cleaning apparatus according to claim 1, wherein the tank has a device for adding a neutralizing solution to the stored water. apparatus. 9. The exhaust gas cleaning apparatus according to any one of claims 1 to 8, wherein the tank has a pump means for sending water containing dust precipitated and floating to a combustion furnace at a bottom portion thereof. An exhaust gas cleaning device characterized by the above-mentioned.