JP2000202234A - Flue gas treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flue gas treating device capable of easily removing a hardly decomposable substance from the used water such as washing water, or cooling water or washing and cooling water after treating flue gas. SOLUTION: A sprinkler 52 is provided in the treating column 51 in which a humidity reducing column is connected to the smoke washing column 51a, and the sprinkler 52 is connected to the treating column 51 by interposing the sending and supplying pump 53 for sending and supplying washing and cooling water 4 and the cooling tower 56 for keeping the washing and cooling water 4 at a prescribed temp., and the discharge valve 54 for discharging partially the used washing and cooling water 4 and the supply valve 55 for supplying fresh washing and cooling water 4 are provided between the sending and supplying pump 53 and the treating column 51, and the surfactant supplying device 57 for adding the surfactant 6 to the washing and cooling water 4 is connected to the downstream side of the sending and supplying pump 53, and also the discharge valve 54 is connected to the water storage tank 61 for storing washing and cooling water 4, and the electrodes 62 and 63 connected to a power source 64 are disposed in the water storage tank 61, and a solid-liq. separation device 66 is connected to the water storage tank 61 by interposing a discharge valve 65.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas treatment apparatus for removing harmful substances contained in flue gas.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show examples of a separate type and an integrated type flue gas treatment apparatus for treating flue gas 1 generated by incinerating garbage, human waste, sewage sludge, and the like.

[Separate type] As shown in FIG. 7, smoke exhaust tower 1 is supplied with smoke exhaust gas 1.
A sprinkler 112 is provided above the inside of the smoke washing tower 111. The sprinkler 112 is connected to a lower part of the smoke washing tower 111 via a feed pump 113 for feeding the washing water 2. Between the feed pump 113 and the smoke tower 111, there are provided a discharge valve 114 for partially extracting the cleaning water 2 after the cleaning and a supply valve 115 for replenishing the new cleaning water 2.

[0004] The smoke washing tower 111 is connected to the cooling tower 121 via a duct. Above the inside of the cooling tower 121,
A sprinkler 122 is provided. The sprinkler 122 is connected to a lower part of the cooling tower 121 via a cooling tower 126 for cooling the cooling water 3 to a predetermined temperature and a feed pump 123 for feeding the cooling water 3. Between the feed pump 123 and the cooling tower 121, there are provided a discharge valve 124 for partially extracting the cooling water 3 used for cooling and a supply valve 125 for replenishing new cooling water 3. Cooling tower 12
1 communicates with a chimney (not shown).

In such a separate type flue gas treatment apparatus, the flue gas 1 (temperature: 120 to 150
C.), the flue gas 1 is washed by the washing water 2 sprayed from the sprinkler 112 via the feed pump 113, and is harmful to acid gases such as HCl and SO _X and dust. Material is removed. Subsequently, the smoke exhaust gas 1 (at a temperature of 70 to 100 ° C.) is sent from the smoke washing tower 111 to the cooling tower 121, and the white smoke is discharged by the cooling water 3 sprayed from the water spray 122 through the feed pump 123. After being cooled to prevent gasification (temperature: 40 ° C.), it is released from the cooling tower 121 to the atmosphere via the chimney.

The washing water 2 used in the smoke tower 111
Is partly withdrawn from the discharge valve 114 and solid-liquid separated from the SS and the like derived from the dust and the like, and then discharged to the outside. The washing water 2 is replenished and recycled. Further, the cooling water 3 used in the cooling tower 112 is heat-exchanged in the cooling tower 113 to be cooled to a predetermined temperature, and is then circulated and reused. The cooling water 3 is supplied from the supply valve 125 to the remaining part of which is withdrawn from the supply valve 125.

[Integral type] As shown in FIG.
The flue gas 1 is supplied to a treatment tower 151 in which a cooling tower 151b is connected to the upper part of 1a. Processing tower 15
A sprinkler 152 is provided above the inside of 1. The sprinkler 152 is provided with a feed pump 15 for feeding the washing cooling water 4.
3 and the washing / cooling water 4 are connected to a lower portion of the processing tower 151 via a cooling tower 156 for maintaining the temperature at a predetermined temperature. Between the feed pump 153 and the processing tower 151,
A discharge valve 15 for partially extracting the used washing cooling water 4
4 and supply valve 15 for replenishing new washing cooling water 4
5 are provided. The processing tower 151 communicates with a chimney (not shown).

In such an integrated flue gas treatment apparatus, the flue gas 1 (temperature: 120 to 150 ° C.) is added to the treatment tower 151.
Is sent, the flue gas 1 is washed by the washing cooling water 4 sprayed from the sprinkler 152 via the feed pump 153 and the cooling tower 156 in the smoke washing tower 151a, and the acidic gas such as HCl or SO _X is removed. While removing harmful substances such as gas and dust, the gas is cooled in the temperature reducing tower 151b (temperature: 40 ° C.), and is discharged from the processing tower 151 to the atmosphere through the chimney.

The washing and cooling water 4 used in the treatment tower 151 is partly withdrawn from the discharge valve 154 to be separated into solid and liquid components such as SS, and then discharged to the outside. The remaining cleaning water 4 is replenished from the supply valve 155 and recycled for reuse.

[0010]

In the above-described flue gas treatment apparatus, when flue gas 1 is washed with washing water 2 and washing cooling water 3, for example, organic halogen-based compounds such as PCBs and dioxins are obtained. Even the hardly decomposable substances are transferred to the washing water 2 and the washing cooling water 3. For this reason, smoke
Although it is necessary to remove the hard-to-decompose substances from the washing water 2 and the washing / cooling water 3 after washing, it is easy to remove such hard-to-decompose substances from the washing water 2 and the washing / cooling water 3. Was not.

In the separate type flue gas treatment apparatus, the hardly decomposable substances in the flue gas 1 that could not be transferred to the washing water 2 are transferred to the cooling water 3 when cooling in the cooling tower 115. Would. For this reason, the concentration of the hardly decomposable substance in the cooling water 3 becomes gradually higher with the circulating reuse, which causes a problem.

In view of the above, the present invention provides a flue gas treatment apparatus capable of easily removing hardly decomposable substances from used water such as washing water, cooling water and washing cooling water after treating flue gas. Aimed to provide.

[0013]

According to a first aspect of the present invention, there is provided a smoke exhaust treatment apparatus for spraying washing water onto smoke to remove harmful substances in the smoke, and the smoke removing means. A flue gas treatment apparatus comprising: a cooling device that sprays cooling water on the smoke-washed flue gas to cool the flue gas, wherein the cooling device supplies hydroxy radicals to the cooling water that cooled the flue gas. Hydroxy radical supply means for water is provided.

According to a second aspect of the present invention, there is provided a smoke exhaust treatment apparatus, comprising: a smoke washer for spraying washing water onto the smoke to remove harmful substances in the smoke; In a flue gas treatment apparatus comprising: a cooling water sprayer for spraying cooling water to cool the flue gas; and a cooling water electrolysis means for performing an electrolysis treatment on the cooling water after cooling the flue gas. It is characterized by having.

According to a third aspect of the present invention, there is provided a smoke exhaust treatment apparatus comprising: a smoke washer for spraying washing water on the smoke to remove harmful substances in the smoke; In a flue gas treatment device comprising: a temperature reducing means for spraying cooling water on smoke to cool the flue gas, wherein a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water after cooling the flue gas And a cooling water electrolysis means for performing an electrolysis treatment on the cooling water that has cooled the flue gas.

According to a fourth aspect of the present invention, there is provided the smoke exhaust treatment device according to any one of the first to third inventions, wherein the cooling water or the smoke exhausted for cooling the exhaust gas is cooled to reduce the temperature. A cooling water surfactant supply means for adding a surfactant to at least one of the cooling water discharged from the means is provided.

According to a fifth aspect of the present invention, there is provided the smoke exhaust treatment device according to any one of the first to fourth inventions, wherein a hydroxy radical supply means for a washing water for supplying a hydroxy radical to the washing water after washing the flue gas. At least one of cleaning water electrolytic means for performing an electrolysis treatment on the cleaning water after cleaning the flue gas is provided.

A sixth aspect of the present invention is the smoke exhaust treatment device according to the fifth invention, wherein the washing water or the smoke exhausted for cleaning the exhaust gas is washed and discharged from the smoke washing means. A cleaning water surfactant supplying means for adding a surfactant to at least one of the cleaning waters is provided.

According to a seventh aspect of the present invention, there is provided a flue gas treatment apparatus according to the fifth or sixth aspect, further comprising a solid-liquid separating means for removing a solid component from the washing water having washed the flue gas. I do.

According to an eighth aspect of the present invention, there is provided a smoke exhaust treatment apparatus, comprising: a smoke washer for spraying washing water onto the smoke to remove harmful substances in the smoke; and the smoke exhauster cleaned by the smoke washer. In a flue gas treatment device comprising: a temperature reducing means for spraying cooling water on smoke to cool the flue gas, wherein a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water after cooling the flue gas Alternatively, at least one of a cooling water electrolyzing means for subjecting the cooling water that has cooled the flue gas to an electrolysis treatment, and cooling the cooling water or the flue gas provided for cooling the flue gas to reduce the amount of the flue gas. A surfactant supply means for cooling water for adding a surfactant to at least one of the cooling water discharged from the warming means, and a hydroxyl radical to the cleaning water for cleaning the flue gas. Hydroxy for washing water Cleaning at least one of radical supply means or cleaning water electrolysis means for performing an electrolysis treatment on the cleaning water after cleaning the flue gas and the cleaning water or the flue gas provided for cleaning the flue gas; And a cleaning water surfactant supply means for adding a surfactant to at least one of the cleaning water discharged from the smoke cleaning means.

According to a ninth aspect of the present invention, in the flue gas treatment apparatus according to the ninth aspect, there is provided a solid-liquid separating means for removing solid components from the washing water obtained by washing the flue gas.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a separate type and integrated type of flue gas treatment apparatus according to the present invention will be described below, but the present invention is not limited to these embodiments.

[Separate Type Smoke Exhaust System] <First Embodiment> A first embodiment in which a smoke exhaust system according to the present invention is applied to a separate type will be described with reference to FIG. . FIG. 1 is a schematic configuration diagram.

As shown in FIG. 1, smoke exhaust tower 1 is supplied with smoke exhaust tower 1. A sprinkler 12 is provided above the inside of the smoke washing tower 11. The sprinkler 12
Smoke washing tower 11 via feed pump 13 for feeding wash water 2
Is connected to the lower part. Feed pump 13 and smoke tower 11
A discharge valve 14 for partially extracting the cleaning water 2 provided for the smoke cleaning and a supply valve 15 for replenishing the new cleaning water 2 are provided between the cleaning water 2 and the cleaning water 2. In the present embodiment, the smoke washing tower 11, the sprinkler 12, the supply pump 13, the discharge valve 14, the supply valve 15, and the like constitute a smoke washing means.

A downstream side of the feed pump 13 is connected to a surfactant supply device 17 which is a surfactant supply means for washing water to which the surfactant 6 is added. The discharge valve 14 is connected to a water storage tank 31 that stores the extracted washing water 2. The inside of the water storage tank 31 has ultraviolet rays (UV).
A UV lamp 32 for irradiating is provided. Water tank 3
An air diffuser 33 connected to an ozone generator 34 for generating the ozone 7 is provided in the vicinity of the UV lamp 32 inside 1. A solid-liquid separation device 36 which is a solid-liquid separation means such as a filter, a sand filter, a coagulation sedimentation device, or the like is connected to a lower portion of the water storage tank 31 via a discharge valve 35. Such a water storage tank 31, a UV lamp 32, an air diffuser 3
3. In the present embodiment, the ozone generator 34, the discharge valve 35, and the like constitute a hydroxy radical supply unit for washing water.

The smoke washing tower 11 is connected to the cooling tower 21 via a duct. A sprinkler 22 is provided above the inside of the cooling tower 21. The sprinkler 22 is connected to a lower part of the cooling tower 21 via a cooling tower 26 for cooling the cooling water 3 to a predetermined temperature and a feed pump 23 for feeding the cooling water 3. Between the feed pump 23 and the cooling tower 21, a discharge valve 24 for partially extracting the cooling water 3 provided for cooling and a supply valve 2 for replenishing the new cooling water 3
5 are provided. The upper part of the cooling tower 21 communicates with a chimney (not shown). Such a cooling tower 21,
In the present embodiment, the sprinkler 22, the supply pump 23, the discharge valve 24, the supply valve 25, the cooling tower 26, and the like constitute a temperature reducing means.

Downstream of the feed pump 23, a surfactant supply device 27, which is a means for supplying a surfactant for cooling water to which the surfactant 6 is added, is connected. Discharge valve 2
Reference numeral 4 communicates with a water storage tank 41 for storing the extracted cooling water 3. A UV lamp 42 for irradiating ultraviolet rays (UV) is provided inside the water storage tank 41. An ozone generator 44 is provided inside the water storage tank 41 near the UV lamp 42.
The air diffuser 43 connected to is provided. Water storage tank 41
A discharge valve 45 is provided at a lower portion of the hopper. In the present embodiment, the water storage tank 41, the UV lamp 42, the air diffuser 43, the ozone generator 44, the discharge valve 45, and the like constitute a hydroxy radical supply means for cooling water.

Next, the operation of the above-mentioned separate type smoke exhaust treatment device will be described. When the feed pump 13 and the surfactant supply device 17 are operated, the washing water 2 (surfactant concentration: about 0.1 to 1%) to which a predetermined amount of the surfactant 6 is added is sprayed from the water sprayer 12. Is done.

Subsequently, when smoke exhaust gas 1 (temperature: 120 to 150 ° C.) is fed into the smoke washing tower 11 from below, the washing water 2
Removes harmful substances such as acid gas such as HCl and SO _X and soot and dust from the flue gas 1. At this time, since the surfactant 6 is added to the washing water 2,
The washing water 2 can transfer almost water-insoluble and hardly decomposable substances such as organic halogenated compounds such as PCBs and dioxins from the flue gas 1 and the sludge 5 derived from the dust.

Next, the discharge valve 14 and the supply valve 1
When the cleaning water 2 is opened, a part of the cleaning water 2 that has washed the flue gas 1 is drawn out and stored in the water storage tank 31, and the new cleaning water 2 is replenished from the supply valve 15 by the feed pump 13. The water is again supplied to the sprinkler 12 and reused.

Here, the UV lamp 32 is operated to irradiate the cleaning water 2 in the water storage tank 31 with UV, and the ozone generator 34 is operated to diffuse the air into the cleaning water 2 in the water storage tank 31.
When the ozone 7 is diffused from 3, the washing water 2 in the water storage tank 31 is removed.
Highly active hydroxy radicals (OH radicals) are generated therein, and the hardly decomposable substances present in the washing water 2 are decomposed and removed.

After the hardly decomposable substance in the washing water 2 is decomposed in this way, the discharge valve 35 is opened and the washing water 2 is fed to the solid-liquid separation device 36. The solid components such as the sludge 5 are separated and removed by the liquid separating device 36, rendered harmless, and discharged to the outside.

On the other hand, the flue gas 1 from which harmful substances such as acid gas and dust have been removed in the smoke washing tower 11 (temperature: 70 to 1)
00 ° C.), and is fed into the cooling tower 21. Subsequently, when the feed pump 23, the cooling tower 26, and the surfactant supply device 27 are operated, the cooling water 3 to which a predetermined amount of the surfactant 6 is added (surfactant concentration: about 0.1 to 1%). Is sprayed from the sprinkler 22 at a predetermined temperature to cool the flue gas 1 (temperature: 40 ° C.) and to transfer a small amount of the hardly decomposable substance remaining in the flue gas 1 without fail.

Next, the discharge valve 24 and the supply valve 2
When the cooling water 3 is released, a part of the cooling water 3 that has cooled the flue gas 1 is extracted and stored in the water storage tank 41, and new cooling water 3 is replenished from the supply valve 25, and the cooling water 3 is cooled by the cooling tower 26. Feed pump 23 while maintaining the temperature
Is sent again to the sprinkler 22 to be reused.

Here, the UV lamp 42 is operated to irradiate the cooling water 3 in the water storage tank 41 with UV, and the ozone generator 44 is operated to diffuse the diffusing pipe 4 into the cooling water 3 in the water storage tank 41.
When the ozone 7 is diffused from the cooling water 3, the cooling water 3
OH radicals are generated therein, and the hardly decomposable substances present in the cooling water 3 are decomposed and removed.

The cooling water 3 thus detoxified by decomposing the hardly decomposable substance is discharged from the water storage tank 41 and discharged to the outside when the discharge valve 45 is opened.

The thus-exhausted smoke 1 from which harmful substances and hardly decomposable substances have been removed is discharged from the cooling tower 22 to the atmosphere via the chimney.

Therefore, according to such a separate type flue gas treatment apparatus, it is possible to easily remove hardly decomposable substances from the washing water 2 and the cooling water 3 after treating the flue gas 1.

The surfactant used in the present invention includes anionic surfactants such as carboxylate (sodium laurate such as soap), sulfate, sulfonate and phosphate. , First to third
Cationic surfactants such as quaternary amine salts and quaternary ammonium salts (such as lauryltrimethylammonium chloride), carboxylate salts (such as sodium laurylaminopropionate), sulfate ester salts and sulfonate salts; Examples include amphoteric surfactants such as phosphate ester salts, and nonionic surfactants such as polyethylene glycol types, polyhydric alcohol types and lower alcohol types (eg, methanol and ethanol).

Examples of the hydroxy radical supply means include a method of irradiating ozone with an ultraviolet lamp using an ultraviolet lamp, a method of using ozone and hydrogen peroxide in combination, a method of irradiating hydrogen peroxide with an ultraviolet lamp, and a method of using ozone and peroxide. There is a method of irradiating hydrogen oxide with ultraviolet rays using an ultraviolet lamp.

An ultraviolet lamp (for example,
The method of irradiating ultraviolet rays with a low-pressure mercury lamp (output: 10 to 200 W) is to generate OH radicals by irradiating ozone (ozone concentration of 10 g / m ³ or more) with ultraviolet rays having wavelengths of 185 nm and 254 nm.

In the above-mentioned method of using ozone and hydrogen peroxide together, OH radicals are generated with an injection amount of hydrogen peroxide of 10 to 5000 mg / liter and an injection amount of ozone of 50 to 5000 mg / liter. .

In the method of irradiating the hydrogen peroxide with ultraviolet rays by using an ultraviolet lamp, the amount of hydrogen peroxide to be injected is 10 to
OH radicals are generated by irradiating an ultraviolet ray from the ultraviolet lamp at 5000 mg / liter.

The method of irradiating the ozone and the hydrogen peroxide with ultraviolet rays using an ultraviolet lamp is to generate OH radicals by further injecting hydrogen peroxide (10 to 5000 mg / l) into the above method.

Among these various hydroxyl radical supply means, those applied in the present invention include the above-mentioned ones.
In the present embodiment, the above method is applied, and the strong OH generated by reacting ozone (O ₃ ) in water with ultraviolet irradiation as shown in the following Chemical Formula 1 is applied. The oxidative decomposition of radicals is used to decompose hardly decomposable substances.

[0046]

Embedded image

Here, when Fe ions, Cu ions, and the like coexist in the washing water 2 and the cooling water 3, as shown in the following Chemical Formula 2, OH radicals are likely to be largely generated by the action of the ions. And the decomposition promoting effect is improved.

[0048]

Embedded image

On the other hand, the hardly decomposable substances to be decomposed by the present invention include harmful chlorinated aromatic compounds represented by dioxins and PCBs, and highly condensed aromatic hydrocarbons, such as garbage and night soil. Harmful substances contained in flue gas generated by incineration of wastewater and sewage sludge.
The harmful substances (or environmental hormones) in the smoke wash that can be decomposed by radicals or electrolysis are not limited to these.

Here, the dioxins are a general term for polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs).
It is said to be generated in trace amounts during the combustion of chlorine compounds and certain organic chlorine compounds, and is a chemically colorless crystal. There are 75 types of PCDDs and 135 types of PCDFs according to the number of chlorines, from monochloride to octachloride. Of these, dibenzo-p-dioxin tetrachloride (T ₄ CDD) is the most common. It is known to be highly toxic. In addition, as harmful chlorinated aromatic compounds, in addition to dioxins, various organic chlorine compounds (for example, aromatic compounds such as phenol and benzene (for example, chlorobenzenes, chlorophenol and chlorotoluene) ), Chlorinated alkyl compounds, etc.) and must be removed from the use water in order to discharge the use water.

PCBs (polychlorinated biphenyls)
Is a generic term for compounds in which several chlorine atoms are added to biphenyl, and there are isomers depending on the number and positions of substitution of chlorine, and 2,6-dichlorobiphenyl, 2,2′-dichlorobiphenyl, 2,3,5 -Trichlorobiphenyl and the like are typical, and are known to be highly toxic and to emit dioxins when incinerated. is there.

<Second Embodiment> A second embodiment in which the smoke exhaust treatment device according to the present invention is applied to a separate type will be described with reference to FIG. FIG. 2 is a schematic configuration diagram thereof. However, the same members as those in the first embodiment described above are denoted by the same reference numerals as those used in the description of the first embodiment, and the description thereof is omitted.

As shown in FIG. 2, the discharge valve 24 below the cooling tower 21 communicates with the discharge valve 14 below the smoke washing tower 11 into the water storage tank 31. In other words, in the first embodiment described above, the hydroxy radical supply means for cooling water and the hydroxy radical supply means for cleaning water are separately provided, but in the present embodiment, the water storage tank 31 and
The cleaning water 2 and the cooling water 3 are treated together by the UV lamp 32, the diffuser 33, the ozone generator 34, the discharge valve 35, and the like, serving as a cooling water hydroxy radical supply unit and a washing water hydroxy radical supply unit. It was made possible.

Therefore, it is possible to obtain the same effect as that of the first embodiment described above, and it is possible to reduce the size at a lower cost than in the case of the first embodiment. be able to.

<Third Embodiment> A third embodiment in which the smoke exhaust treatment device according to the present invention is applied to a separate type will be described with reference to FIG. FIG. 3 is a schematic configuration diagram thereof. However, the same members as those in the above-described second embodiment are denoted by the same reference numerals as those used in the description of the above-described second embodiment, and description thereof is omitted.

As shown in FIG. 3, the discharge valve 14 below the smoke washing tower 11 and the discharge valve 24 below the cooling tower 21 are connected to a receiving port of a solid-liquid separator 36. The liquid delivery outlet of the solid-liquid separator 36 communicates with the inside of the water storage tank 31.

That is, in the second embodiment described above, the sludge 5 and the like are separated by the solid-liquid separator 36 after the hardly decomposable substance is decomposed in the water tank 31. In the form, the sludge 5
After the separation, the hardly decomposable substance is decomposed in the water storage tank 31.

For this reason, since the ultraviolet irradiation can be performed without sludge 5 or the like, the ultraviolet irradiation can be performed efficiently, and the generation efficiency of the OH radical can be improved.

Therefore, it is possible to obtain the same effect as in the second embodiment described above, as well as to decompose the hardly decomposable substance more than in the second embodiment. Efficiency can be improved.

<Fourth Embodiment> A fourth embodiment in which the smoke exhaust treatment device according to the present invention is applied to a separate type will be described with reference to FIG. FIG. 4 is a schematic configuration diagram thereof. However, for members similar to those of the above-described third embodiment, the same reference numerals as those used in the description of the above-described third embodiment will be used, and descriptions thereof will be omitted.

As shown in FIG. 4, the discharge valve 24 below the cooling tower 21 is connected directly to the water storage tank 31 without being connected to the solid-liquid separator 36. In other words, in the third embodiment described above, the cooling water 3 containing almost no sludge 5 and the like is also solid-liquid separated by the solid-liquid separation device 36 together with the washing water 2, but in the present embodiment, the sludge 5 and the like are separated. The cooling water 3 that is not included is directly fed into the water storage tank 31 without passing through the solid-liquid separation device 36.

Therefore, it is possible to obtain the same effect as that of the third embodiment described above, and also, it is possible to obtain the solid-liquid separation device 36 more efficiently than the case of the third embodiment. Since the scale can be reduced,
The size can be reduced at low cost.

[Integrated Smoke Exhaust System] <First Embodiment> A first embodiment in which a smoke exhaust system according to the present invention is applied to an integrated system will be described with reference to FIG. . FIG. 5 is a schematic configuration diagram thereof.

As shown in FIG. 5, the flue gas 1 is supplied to a treatment tower 51 in which a temperature reducing tower 51b is connected to an upper part of a smoke washing tower 51a. Above the inside of the processing tower 51,
A sprinkler 52 is provided. The sprinkler 52 is provided with a feed pump 5 for feeding the washing / cooling water 4 serving as both washing water and cooling water.
The cooling water 3 and the cleaning water 4 are connected to a lower portion of the processing tower 51 via a cooling tower 56 for keeping the temperature at a predetermined temperature. Between the feed pump 53 and the processing tower 51, there are provided a discharge valve 54 for partially extracting the used washing cooling water 4 and a supply valve 55 for replenishing the new washing cooling water 4. The upper part of the processing tower 51 communicates with a chimney (not shown). In the present embodiment, the processing tower 51, the water sprinkler 52, the supply pump 53, the discharge valve 54, the supply valve 55, the cooling tower 56, and the like constitute a smoke washing means and a temperature reducing means in this embodiment.

On the downstream side of the feed pump 53, a surfactant for supplying a surfactant for cleaning water for adding a surfactant 6 to the cleaning and cooling water 4 and a surfactant for supplying surfactant for cooling water are also provided. The supply device 57 is connected. Discharge valve 54
Communicates with a water storage tank 61 for storing the extracted cleaning cooling water 4. Electrodes 62 and 63 are provided in the water storage tank 61. These electrodes 62 and 63 are connected to a power supply 64. A solid-liquid separation device 66 such as a filter, a sand filter, a coagulation sedimentation device, or the like is connected to a lower portion of the water storage tank 61 via a discharge valve 65.
Such a water storage tank 61, an anode 62, a cathode 63, a power supply 6
4. In the present embodiment, the discharge valve 65 and the like serve as both cooling water electrolysis means and cleaning water electrolysis means.

Next, the operation of the above-mentioned integrated smoke exhaust treatment device will be described. When the feed pump 53 and the surfactant supply device 57 are operated, the cleaning cooling water 4 (surfactant concentration: about 0.1 to 1%) to which the surfactant 6 is added by a predetermined amount is supplied from the water sprayer 52. Sprayed.

Subsequently, the flue gas 1 (temperature: 12
0 to 150 ° C.), the flue gas 1
As a result, harmful substances such as acid gas such as HCl and SO _X and soot and dust are removed and, after cooling to a predetermined temperature (temperature: 40 ° C.), are discharged from the processing tower 51 to the atmosphere via the chimney. . At this time, since the surfactant 6 is added to the cleaning cooling water 4, the cleaning cooling water 4
Can transfer almost hardly water-soluble hardly decomposable substances from the flue gas 1 or the sludge 5.

Next, the discharge valve 54 and the supply valve 5
5 is released, the washing cooling water 4 for washing and cooling the flue gas 1
A part of the water is drained and stored in the water storage tank 61, and is re-supplied to the sprinkler 52 by the feed pump 53 while being replenished with the new washing / cooling water 4 from the supply valve 55 for reuse.

Here, when the power supply 32 is operated, the water tank 6
The hardly decomposable substance present in the washing cooling water 4 in the electrolyzer 1 is electrolyzed and removed.

After electrolyzing the hardly decomposable substance in the washing / cooling water 4 in this manner, the discharge valve 65 is opened to feed the washing / cooling water 4 to the solid-liquid separation device 66. The solid components such as the sludge 5 are separated and removed by the solid-liquid separation device 66, rendered harmless, and discharged to the outside.

Therefore, according to such an integrated flue gas treatment apparatus, the hardly decomposable substances can be easily removed from the cleaning cooling water 4 after treating the flue gas 1.

<Second Embodiment> A second embodiment in which the smoke exhaust treatment device according to the present invention is applied in an integrated manner will be described with reference to FIG. FIG. 6 is a schematic configuration diagram thereof. However, the same members as those in the first embodiment described above are denoted by the same reference numerals as those used in the description of the first embodiment, and the description thereof is omitted.

As shown in FIG. 6, the discharge valve 54 below the processing tower 51 is connected to a receiving port of a solid-liquid separation device 66. The liquid supply outlet of the solid-liquid separator 66 is connected to the water tank 61.
Contact within.

That is, in the above-described first embodiment, the sludge 5 and the like are separated by the solid-liquid separation device 66 after the hardly decomposable substance is decomposed in the water storage tank 61. In the form, sludge 5
After the separation, the hardly decomposable substance is decomposed in the water tank 61.

Therefore, the electrolysis can be performed without sludge 5 or the like, so that the electrolysis can be performed efficiently.

Therefore, it is possible to obtain the same effect as that of the first embodiment described above, and it is also possible to decompose the hardly decomposable substance more than the case of the first embodiment. Efficiency can be improved.

In the above-described separate type and integrated type embodiments, the smoke circulating tower 11, the cooling tower 21, and the processing tower 51 are circulated, that is, the cleaning for cleaning and cooling the exhaust gas 1 is performed. Surfactant 6 in water 2, cooling water 3 and cleaning cooling water 4
Is added so that the hardly decomposable substances present in the flue gas 1 and the sludge 5 can be easily transferred to the washing water 2, the cooling water 3 and the washing cooling water 4. 14, 24, 54, that is,
Cleaning water 2 and cooling water 3 that are discharged by cleaning and cooling the flue gas 1
It is also possible to add a surfactant 6 to the cleaning cooling water 4.

Further, in each of the above-described embodiments, the hydroxy radical supplying means is applied to the separate type, and the electrolytic means is applied to the integrated type. However, the electrolytic means is applied to the separate type, and the hydroxy radical is applied to the integrated type. The supply means can be applied, of course, and the hydroxy radical supply means is applied to the decomposition treatment of the hardly decomposable substance in the cleaning water 2, and the electrolytic means is applied to the decomposition treatment of the hardly decomposable substance in the cooling water 3. Alternatively, it is also possible to apply the electrolytic means to the decomposition treatment of the hardly decomposable substance in the washing water 2 and to apply the hydroxy radical supply means to the decomposition treatment of the hardly decomposable substance in the cooling water 3. It is. Furthermore, it is also possible to use both the hydroxy radical supply means and the electrolytic means for the decomposition treatment of the hardly decomposable substances in the cleaning water 2, the cooling water 3 and the cleaning cooling water 4.

In each of the above-described embodiments, the cleaning water 2, the cooling water 3 and the cleaning cooling water 4 obtained by decomposing the hardly decomposable substance are discharged to the outside as they are. Alternatively, these used waters 2 to 4 can be returned to the circulation line from the supply valves 15, 25, and 55 together with the new waters 2 to 4 and reused.

[0080]

According to the first aspect of the present invention, there is provided a flue gas treatment apparatus,
A smoke-washing means for spraying washing water on the flue gas to remove harmful substances in the flue gas; And a cooling water supply unit for supplying hydroxyl radicals to the cooling water that has cooled the flue gas, so that the cooling water is supplied to the cooling water that cools the flue gas. By supplying hydroxy radicals from the hydroxy radical supply means for use, the hardly decomposable substances in the cooling water can be decomposed to easily remove the hardly decomposable substances from the cooling water.

A smoke exhaust treatment apparatus according to a second aspect of the present invention comprises a smoke washer for spraying washing water on the smoke and removing harmful substances in the smoke, and the smoke waster washed by the smoke washer. In a flue gas treatment apparatus comprising: a cooling water sprayer for spraying cooling water to cool the flue gas; and a cooling water electrolysis means for performing an electrolysis treatment on the cooling water after cooling the flue gas. Therefore, by subjecting the cooling water that has cooled the flue gas to electrolytic treatment by the cooling water electrolysis means, it is possible to electrolyze the hardly decomposable substances in the cooling water and easily remove the hardly decomposable substances from the cooling water. Can be.

[0082] A third aspect of the present invention provides a smoke exhaust treatment device, comprising: a smoke washer for spraying washing water on the smoke to remove harmful substances in the smoke; and the smoke exhauster cleaned by the smoke washer. In a flue gas treatment device comprising: a temperature reducing means for spraying cooling water on smoke to cool the flue gas, wherein a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water after cooling the flue gas And electrolytic means for cooling water that performs an electrolysis treatment on the cooling water that has cooled the flue gas,
Hydroxy radicals are supplied from the cooling water hydroxy radical supply means to the cooling water that has cooled the flue gas, and the cooling water is subjected to electrolytic treatment by the cooling water electrolysis means, thereby decomposing the hardly decomposable substances in the cooling water. Thus, the hardly decomposable substance can be easily removed from the cooling water.

According to a fourth aspect of the present invention, there is provided the smoke exhaust treatment device according to any one of the first to third inventions, wherein the cooling water or the smoke exhausted for cooling the exhaust gas is cooled to reduce the temperature. A cooling water surfactant supply means for adding a surfactant to at least one of the cooling water discharged from the cooling water means; To the side, and it is possible to reliably prevent the hardly decomposable substance from leaking out together with the smoke.

According to a fifth aspect of the present invention, there is provided the smoke exhaust treatment apparatus according to any one of the first to fourth inventions, wherein a hydroxy radical supply means for washing water for supplying hydroxy radicals to the washing water after washing the smoke exhaust. Since at least one of the cleaning water electrolysis means for performing an electrolysis treatment on the cleaning water after cleaning the flue gas is provided, the hydroxyl radical is supplied from the cleaning water hydroxy radical supplying means to the cleaning water after cleaning the flue gas. By performing the electrolytic treatment with the washing water electrolysis means, the hardly decomposable substance in the wash water can be decomposed to easily remove the hardly decomposable substance from the cooling water.

The smoke exhaust treatment apparatus according to a sixth aspect of the present invention is the fifth aspect of the present invention, wherein the cleaning water or the smoke exhausted for cleaning the smoke exhaust is washed and discharged from the smoke washing means. Since the surfactant supply means for washing water for adding a surfactant to at least one of the washing water of the washing water is provided, the hardly decomposable substances present in the flue gas and solids are disposed on the washing water side. The transfer can be reliably performed, and it is possible to reliably prevent the hardly decomposable substance from leaking to the outside together with smoke and solid components.

According to the seventh aspect of the present invention, there is provided a flue gas treatment apparatus according to the fifth or sixth aspect, wherein solid-liquid separation means for removing solids from the washing water that has washed the flue gas is provided. If solids are removed from the wash water before the decomposition of the hardly decomposable substances in the wash water, the decomposition of the hardly decomposable substances can be performed efficiently, and If the solids are removed from the washing water after the decomposition, the hardly decomposable substances attached to the solids can be surely decomposed.

The smoke exhaust treatment apparatus according to the eighth invention is a smoke exhaust means for spraying washing water to the smoke exhaust to remove harmful substances in the smoke exhaust, and the smoke exhaust means washed by the smoke exhaust means. In a flue gas treatment device comprising: a temperature reducing means for spraying cooling water on smoke to cool the flue gas, wherein a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water after cooling the flue gas Alternatively, at least one of a cooling water electrolyzing means for subjecting the cooling water that has cooled the flue gas to an electrolysis treatment, and cooling the cooling water or the flue gas provided for cooling the flue gas to reduce the amount of the flue gas. A surfactant supply means for cooling water for adding a surfactant to at least one of the cooling water discharged from the warming means, and a hydroxyl radical to the cleaning water for cleaning the flue gas. Hydroxy for washing water Cleaning at least one of radical supply means or cleaning water electrolysis means for performing an electrolysis treatment on the cleaning water after cleaning the flue gas and the cleaning water or the flue gas provided for cleaning the flue gas; And a detergent water supply means for adding a surfactant to at least one of the wash water discharged from the smoke washing means. The washing water to which the surfactant has been added from the means is supplied with hydroxy radicals by the washing water hydroxy radical supply means or subjected to electrolytic treatment by the washing water electrolytic means, and the cooling water surfactant supply means. Since the cooling water to which the surfactant is added is supplied with hydroxy radicals by the cooling water hydroxy radical supply means or subjected to electrolytic treatment by the cooling water electrolysis means, With the hardly decomposable substance present like or sludge can be effectively shifts to the wash water or cooling water, hardly decomposable substance which has shifted to the washing water or cooling water can be reliably decomposing.

According to the ninth aspect of the present invention, the flue gas treatment apparatus according to the ninth aspect of the present invention is provided with a solid-liquid separating means for removing solids from the washing water obtained by washing the flue gas. If the solids are removed from the wash water before the decomposition treatment of the hardly decomposable substance, the decomposition of the hardly decomposable substance can be performed efficiently, and the decomposition of the hardly decomposable substance in the wash water can be performed. If the solids are subsequently removed from the wash water, the hardly decomposable substances attached to the solids can be reliably decomposed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment when a smoke exhaust treatment device according to the present invention is applied to a separate type.

FIG. 2 is a schematic configuration diagram of a second embodiment in which the smoke exhaust treatment device according to the present invention is applied to a separate type.

FIG. 3 is a schematic configuration diagram of a third embodiment when a smoke exhaust treatment device according to the present invention is applied to a separate type.

FIG. 4 is a schematic configuration diagram of a fourth embodiment when a smoke exhaust treatment device according to the present invention is applied to a separate type.

FIG. 5 is a schematic configuration diagram of a first embodiment when a smoke exhaust treatment device according to the present invention is applied in an integrated manner.

FIG. 6 is a schematic configuration diagram of a second embodiment in which a smoke exhaust treatment device according to the present invention is applied in an integrated manner.

FIG. 7 is a schematic configuration diagram of an example of a conventional separate type flue gas treatment apparatus.

FIG. 8 is a schematic configuration diagram of an example of a conventional integrated smoke exhaust treatment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Smoke exhaustion 2 Washing water 3 Cooling water 4 Washing cooling water 5 Sludge 6 Surfactant 7 Ozone 11 Smoke washing tower 12,22 Sprinkler 13,23 Feed pump 14,24 Discharge valve 15,25 Supply valve 17,27 Interface Activator supply device 21 Cooling tower 26 Cooling tower 31, 41 Water storage tank 32, 42 UV lamp 33, 43 Aeration tube 34, 44 Ozone generator 35, 45 Discharge valve 36 Solid-liquid separator 51 Treatment tower 51a Smoke tower 51b Reduction Hot tower 52 Sprinkler 53 Feed pump 54 Discharge valve 55 Supply valve 56 Cooling tower 57 Surfactant supply device 61 Water storage tank 62, 63 Electrode 64 Power supply 65 Discharge valve 66 Solid-liquid separation device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Honda 1-8-1 Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Masamichi Asano, Kachizawa-ku, Yokohama, Kanagawa Prefecture 8-chome 1, Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Satoshi Okuno 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. Yokohama Works F-term (reference) 4D002 AA02 AA19 AA21 AC04 AC10 BA02 BA08 BA09 BA13 BA14 CA01 CA07 DA35 DA51 DA64 EA02 GA01 GA02 GB01 GB02 GB03 GB08 HA07 HA08 4D037 AA15 AB14 BA18 CA02 CA04 CA06 CA08 CA12 4D050 AA12 AB19 BB02 BB09 BC09 BD02 BD03 BD06 BD08 CA10 CA15 CA16 4D061 DA08 DB19 DC09 EA03 FA19

Claims (9)

[Claims] 1. A smoke-cleaning means for spraying cleaning water on flue gas to remove harmful substances in the flue gas, and a cooling water spraying on the flue gas cleaned by the smoke-cleaning means. A flue gas treatment device comprising: a temperature reducing means for cooling smoke; and a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water for cooling the flue gas. Processing equipment. 2. Smoke washing means for spraying washing water on the flue gas to remove harmful substances in the flue gas; and cooling water on the flue gas cleaned by the smoke washing means by spraying cooling water on the flue gas. A flue gas treatment apparatus comprising: a smoke reducing means for cooling smoke; and a cooling water electrolysis means for performing an electrolysis treatment on the cooling water after cooling the flue gas. . 3. Smoke washing means for spraying washing water on the flue gas to remove harmful substances in the flue gas; and cooling water on the flue gas washed by the smoke cleaning means to spread the cooling water. A flue gas treatment apparatus comprising: a temperature reducing means for cooling smoke; a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water for cooling the flue gas; and the cooling for cooling the flue gas. A flue gas treatment apparatus, comprising: cooling water electrolysis means for electrolyzing water. 4. The flue gas treatment device according to claim 1, wherein the cooling water or the flue gas used for cooling the flue gas is cooled and discharged from the temperature reducing means. A flue gas treatment apparatus comprising a cooling water surfactant supply means for adding a surfactant to at least one of the cooling waters. 5. The flue gas treatment apparatus according to claim 1, wherein hydroxy radical supply means for cleaning water for supplying hydroxy radicals to the cleaning water after cleaning the flue gas or cleaning the flue gas. A flue gas treatment apparatus provided with at least one of cleaning water electrolysis means for subjecting the cleaning water to electrolysis. 6. The flue gas treatment apparatus according to claim 5, wherein the cleaning water used for cleaning the smoke or the cleaning water that cleans the smoke and is discharged from the smoke cleaning unit. A smoke-supplying device, comprising a washing water surfactant supplying means for adding a surfactant to at least one of the washing waters. 7. The flue gas treatment apparatus according to claim 5, further comprising a solid-liquid separation unit that removes a solid component from the cleaning water that has washed the flue gas. . 8. Smoke washing means for spraying washing water on the smoke and removing harmful substances in the smoke, and cooling water on the smoke and the smoke removed by the smoke washing means. A flue gas treatment device comprising: a temperature reducing means for cooling smoke; a hydroxy radical supply means for cooling water for supplying hydroxy radicals to the cooling water for cooling the flue gas; or the cooling water for cooling the flue gas. At least one of a cooling water electrolysis means for performing an electrolysis treatment on the cooling water and the cooling water provided for cooling the flue gas or the cooling water discharged from the temperature reducing means by cooling the flue gas A surfactant supply means for cooling water for adding a surfactant to at least one of the cooling waters; a hydroxy radical supply means for cleaning water for supplying hydroxy radicals to the cleaning water for cleaning the flue gas; smoke At least one of the cleaning water electrolysis means for performing an electrolysis treatment on the washed cleaning water, and the cleaning water or the smoke discharged for the cleaning of the flue gas is cleaned and discharged from the smoke cleaning means. A cleaning water surfactant supplying means for adding a surfactant to at least one of the cleaning waters. 9. The flue gas treatment apparatus according to claim 8, further comprising a solid-liquid separation unit that removes a solid component from the cleaning water that has washed the flue gas.