JP2744580B2 - Wet washing filtration backwashing continuous scrubber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the prevention of air pollution.
The present invention relates to a wet scrubbing and backwashing continuous scrubber that separates or removes sulfur atoms or sulfur or chlorine compounds from discharged smoke and deodorizes odorous substances in the smoke and collects dust as a wet bag filter.

In particular, the present invention performs desulfurization, denitration, dechlorination, dehydrochlorination, deodorization, dust collection, and deodorization of foul odor sources at the source by combustion of industrial boilers and incinerators using heavy oil and coal. The present invention relates to a small, efficient, and inexpensive wet scrubbing backwash continuous scrubber.

[0003]

2. Description of the Related Art A conventional exhaust gas treatment apparatus includes a purification apparatus having a vertical or horizontal Raschig ring type filler for large-scale combustion of heavy oil, coal, and the like. There are some using a scrubber and a venturi scrubber.

Further, the conventional exhaust gas treatment apparatus does not have a deodorization treatment apparatus for decomposing and deodorizing malodorous substances in flue gas, and it is necessary to provide another deodorization treatment apparatus outside the exhaust gas treatment apparatus. Something like a bag filter or an electric dust collector had to be installed separately.

[0005]

The conventional scrubber having a Raschig-type filler has the drawbacks of low collection efficiency, a large and complicated apparatus itself, and a high price. Can not be a compact type.

[0006] Further, in this device, since the flue gas passes slowly through the filler, the pressure loss is large, and the shaft horsepower of the blower is increased by that much, resulting in a high operating cost.

Further, in the case of using a fan scrubber, since the fan is sprayed with water and brought into contact with water and air, the shaft horsepower of the blower is increased and the operating cost is increased.

Further, conventional fan scrubbers, spray scrubbers, venturi scrubbers and the like have the disadvantages that the contact between water and air is insufficient, the desulfurization efficiency is low, and the black smoke from the chimney does not disappear.

[0009] Further, if the exhaust gas contains an odorous substance, a deodorization treatment device is required in addition to the exhaust gas treatment device, and the exhaust gas treatment device itself becomes much larger.
It has the disadvantage of being more expensive.

[0010] The present invention is a small, simple and inexpensive device for reducing the amount of flue gas generated by burning small-scale heavy oil such as a boiler or coal, or flue gas from an incinerator or the like. An object of the present invention is to provide an exhaust gas treatment device having high desulfurization, dechlorination and dehydrochlorination efficiencies, deodorization and dust collection functions, and to provide a wet scrubbing backwash continuous scrubber that can be easily increased in size.

Further, in a conventional electric dust collector such as an incinerator for municipal garbage, when performing hammering for removing dust from the dust collecting electrode, a wet scrubbing backwash continuous scrubber which solves the problem of re-scattering of dioxins and the like. The purpose is to provide.

[0012]

In order to achieve the above object, the present invention relates to a circulating water tank containing an aqueous solution of an alkali such as sodium hydroxide, calcium hydroxide, magnesium or ammonia, an aqueous solution of hypochlorous acid or chlorine dioxide. Boilers, smoke from incinerators, or odors from odor sources are supplied to a fan scrubber that supplies water in a spray form from the surroundings through an automatic control damper and a venturi type jet scrubber.

In the front part, a filter made of stainless steel or a combination of different meshes made of resin such as polypropylene, heat-resistant polypropylene, vinylidene fluoride and Teflon, or a crushed resin product, a ceramic ball or a crushed product is used. A case type filter using a filled mesh is provided, and a gas scrubber provided with a nozzle for injecting water in the circulating water tank is provided above the circulating water tank from the front-rear direction to the front direction.

A gas-liquid separator is provided at an intermediate portion of the gas scrubber, and a chimney for discharging exhaust gas to the atmosphere is provided at a rear portion of the gas scrubber.

A circulating water supply pipe connected via a pump and a ceramic filter is provided between the nozzles in the lower part of the circulating water tank, around the fan scrubber, and before and after the filter in front of the gas scrubber.

[0016] Drain pipes for returning water to the circulating water tank from below the fan scrubber and from below the front and middle portions of the gas scrubber are provided.

Further, the water in the circulating water tank is filtered through a diatomaceous earth tank containing diatomaceous earth as a precoat agent, and then through a coating filter coated with diatomaceous earth, and the filtered water is supplied to the diatomaceous earth tank and a pH-adjusted water tank for adjusting pH. Provide a filtered water supply pipe.

[0018]

The smoke exhausted at about 280 ° C. from the boiler 45 is controlled by the automatic control damper 48 and the smoke discharged from the incinerator 50
The flue gas at 0 to 1200 ° C. is supplied to the inlet of the fan scrubber 1 via the venturi type jet scrubber 52.

In the fan scrubber 1, the nozzle 6
This sprays an aqueous solution of sodium hydroxide, calcium, magnesium, ammonia or the like in the circulating water tank 14, and the aqueous solution is turned into steam by the heat of the flue gas, and the temperature of the flue gas is set to 60 to 70 ° C.

That is, the sprayed water becomes steam, and the exhaust gas can be carried in the airflow. Therefore, it is not necessary to apply water directly to the fan blades to make contact between the water and the exhaust gas. Less power.

The soot, ash, and other dust in the exhaust gas that is entrained in the air flow inside the fan scrubber 1 is used to filter the stainless steel fine mesh at the front of the gas scrubber 7 and other resin meshes. Alternatively, it collides with water jetted from a nozzle 11 in front of a crushed product made of resin, a mesh filled with ceramic balls or crushed product, a case type filter having a different thickness, and the like, and passes through a drain pipe 19 to a circulating water tank 14. Flows to

At this time, the impeller of the fan-side blower (fan scrubber 1) is inserted into these filters or a filler filled with a crushed product made of resin, a mesh filled with ceramic balls or crushed products, or a case type filter having a different thickness. The water drops and the wind collide with each other more violently, instantaneously exhibiting a venturi effect, and can collect dust, neutralize and deodorize as described below with low pressure loss.

It is applied to a filter made of stainless steel fine mesh, a filter made of a different resin mesh, a resin crushed product, a mesh filled with ceramic balls or crushed products, a case type filter made of a different thickness, and the like. Help,
Dust such as ash is pushed forward (backwashed) by water jetted from a nozzle 11 behind the filter 10 to eliminate clogging, and can flow to the circulating water tank 14 through the drain pipe 19.

If the mesh of the filter made of stainless steel fine mesh, another filter made of a different resin mesh or the case type filter or the like, or the filling material is made fine, the filter 10 becomes a wet bag filter. It can also play a role, and the pressure loss can be reduced as compared with a dry type by taking a large filtration area.

Sulfurous acid gas (SO ₂ ) in the flue gas reacts with the aqueous sodium hydroxide solution in the circulating water tank 14 sprayed from the nozzle 6, and as shown in Chemical Formulas 1 and 2, sodium sulfite gas (Na ₂ SO ₃₎ ), Sodium sulfate (Na ₂ SO ₄ )
And can be removed by flowing to the circulating water tank 14 through the drain pipe 18.

[0026]

Embedded image 2NaOH + SO ₂ → Na ₂ SO ₃ + H ₂ O

[0027]

## STR2 ## 2Na ₂ SO ₃ + O ₂ → 2Na ₂ SO ₄

Further, sulfur dioxide is produced by contact between water and air.
And sulfuric acid (H _TwoSO_Four) And Io
(C) occurs.

[0029]

Embedded image 3SO ₂ + 2H ₂ O → H ₂ S ₂ O ₄ + H ₂ SO ₄

[0030]

Embedded image H ₂ S ₂ O ₄ → S + H ₂ SO ₄

Further, sulfurous acid gas and calcium hydroxide [Ca
(OH) ₂ ] and magnesium hydroxide [Mg (OH) ₂ ] aqueous solution are the same as those in Chemical formulas 1 and 2, respectively.

Sulfurous acid gas reacts with an aqueous ammonia solution to produce ammonium sulfite [(NH
₄ ) ₂ SO ₃ ], ammonium bisulfite (NH ₄ HSO ₃ ).

[0033]

Embedded image SO ₂ + 2NH ₃ + H ₂ O → (NH ₄ ) ₂ SO ₃

[0034]

Embedded image SO ₂ + NH ₃ + H ₂ O → NH ₄ HSO ₃

The unreacted sulfur dioxide in the flue gas reacts with the ammonium sulfite in the circulating water and can be removed as ammonium bisulfite as shown in Chemical formula 7, and the SO ₂ removal rate can be further increased.

[0036]

Embedded image SO ₂ + (NH ₄ ) ₂ SO ₃ + H ₂ O → 2NH ₄ HSO ₃

The diatomaceous earth tank 2 further connected to the circulating water tank 14
The water from the circulating water tank 14 from 1 is passed through a coating filter 25 having a built-in stainless steel mesh tube pre-coated with diatomaceous earth, so that products such as soot, ash and other dust, and sulfides are filtered. Become.

Then, the filtered water from the coating filter 25 is supplied to the diatomaceous earth tank 21 and the pH adjusting water tank 34 via the branch pipes 39 and 40 of the filtered water supply pipe 33 by the valves 41 and 42.

Since the water in the circulating water tank 14 is supplied to the circulating water supply pipe 15a by the pump 15 via the ceramic filter 16, this ceramic treated water has a function of preventing scale from adhering to the pipe and a function of silicon dioxide. Since the treated water has an action of generating active oxygen, it is possible to prevent the pipeline from being closed and to perform deodorization and oxidation using active oxygen.

Hydrogen sulfide (H ₂ S), methyl mercaptan (CH ₄ S), methyl sulfide (C ₂ H ₆ S) in flue gas
Odor substances such as fan scrubber 1 and gas scrubber 7
Then, it is washed with sodium hypochlorite (NaOCl) and chlorine dioxide (ClO ₂ ) supplied from the nozzles 6 and 11 to oxidatively decompose and deodorize.

Since hypochlorous acid and chlorine dioxide have a strong oxidizing power, besides the above-mentioned deodorizing action, a bactericidal action which kills organisms such as bacteria, viruses, slime molds, spores, molds, enzymes and algae. There is.

Further, the oxygen (O ₂ ) generated as shown in Chemical formulas (8) and (9) can clean the inner wall of the apparatus and has a cleaning action.

Active oxygen is generated by passing through the silicon dioxide ceramic filter 16, and the ORP value (oxidation-reduction potential) is further doubled in addition to the oxygen of chemical formulas 8 and 9, thereby doubling the oxidation and deodorizing effects. Is done.

The ORP value can be measured by attaching an oxidation-reduction potentiometer to the circulating water tank 14.

[0045]

Embedded image 2NaOCl → 2NaCl + O ₂

[0046]

2ClO ₂ → Cl ₂ + 2O ₂ However, chlorine (Cl ₂ ) generated in Chemical formula 9 can be removed as sodium chloride (NaCl) as shown in Chemical formulas 12 and 13 described below.

[0047]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a continuous scrubber of the present invention.

FIG. 1 is a front view of the device of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a piping diagram of the device of the present invention used in a boiler, and FIG. 4 is a piping diagram of the device of the present invention. .

Numeral 1 denotes a fan scrubber provided on a gantry 2 for rotating a rotor having plate fins by a motor 3 at a high speed. Equipment.

Reference numeral 6 denotes a water spray nozzle, and a fan scrubber 1
And the smoke exhaust port 4 and the like are installed inwardly.

Numeral 7 denotes a gas scrubber which is formed by forming a smoke exhaust port 8 at the front end into a tapered shape which becomes thinner toward the tip, and connecting a flange 8a at the tip with a flange 5a at the tip of the discharge pipe 5 of the fan scrubber 1. It is fixedly connected to the flanges 9a, 9b at the nine ends.

Reference numeral 10 denotes a filter provided at the front of the gas scrubber 7, which is formed by stacking several stainless steel wire meshes each having a mesh size of 1 mm, and a resin such as polypropylene, heat-resistant polypropylene, vinylidene fluoride, and Teflon. If the filtration efficiency is increased with a combination of different types of mesh made of plastic, or a crushed resin product, a mesh filled with ceramic balls or crushed products, or a case type filter with a different thickness, increase the number of sheets Use a fine mesh or a fine mesh for the case that contains the filling, or use a fine filling to remove dust such as soot and ash from the smoke, Remove the mist inside.

As the material of the crushed product made of resin, there can be used all materials usable as a Raschig-type filler such as polypropylene, polyvinyl chloride, acrylonitrile, butadiene and styrene resin.

Further, the ceramic ball has a diameter of 1 to 10 mmφ.
Etc., and crushed products of various dimensions are applicable.

The characteristic of the ceramic ball is that it can prevent the adhesion of scale and the like to the vessel wall, and the silicon ball (S
In those containing iO ₂ ) as a main component, active oxygen is generated by collision between ceramics, the oxidation-reduction potential (ORP) increases rapidly, and can be used for oxidizing nitrogen monoxide (NO) and SO ₂ .

By making the mesh of the stainless steel wire mesh finer, or making the mesh of the case accommodating the filler finer or thicker, or using a finer filler, the filter 10 can be a wet bag. It can be used as a filter and can reduce pressure loss compared to a dry bag filter.

Numeral 11 denotes a water injection nozzle which injects water toward the smoke exhaust port 8 of the gas scrubber 7 in front of and behind the filter 10 to collide with the smoke exhaust from the exhaust port 8 and to filter the filter 10. Push the garbage trapped in the front to the back, and backwash.

Reference numeral 12 denotes a gas-liquid separator, which comprises a number of corrugated plates provided at an intermediate portion of the gas scrubber 7 and separates washed exhaust gas and water.

Reference numeral 13 denotes a chimney provided at the rear of the gas scrubber 7, which is separated from water by the gas-liquid separator 12, and discharges washed exhaust gas to the atmosphere.

Reference numeral 14 denotes a circulating water tank provided below the gas scrubber 7 and has a volume of 1 to 100 m ³ depending on each model and processing capacity.
The container contains any of alkalis such as magnesium and aqueous ammonia.

Reference numeral 15 denotes a pump, which is interposed in a circulating water supply pipe 15a connecting the lower part of the circulating water tank 14 with each of the water spray nozzles 6 and the water spray nozzles 11, and supplies circulating water to the fan scrubber 1 and the gas scrubber 7.

Reference numeral 16 denotes a ceramic filter provided with a bypass 16a, which is filled with a ceramic such as granular silicon dioxide or barium titanate having a diameter of about 1 to 3 mm, and is interposed at the base of the pump 15 of the circulating water supply pipe 15a. The circulating water is filtered to remove soot, ash, etc., and the circulating water is subjected to ceramic treatment. The nozzles 6 and 11 and the supply pipe 15a
The scale is prevented from adhering to the inside and the scale is prevented from being blocked.

In the circulating water which has been ceramic-treated with silicon dioxide, active oxygen is generated, so that deodorization and oxidation can be performed efficiently.

A stop valve 17 is interposed between the suction and discharge sides of the pump 15 of the circulating water supply pipe 15a and the supply sides of the spray nozzle 6 and the injection nozzle 11, respectively. Stop and replace the circulating water supply when necessary.

Reference numerals 18, 19 and 20 denote drain pipes provided between the lower ends of the fan scrubber 1, the filter 10 of the gas scrubber 7, and the gas-liquid separator 12 and the circulating water tank 14, respectively. return.

Numeral 21 denotes a diatomaceous earth tank filled with diatomaceous earth, in which a communication pipe 22 is provided above the circulating water tank 14.

A connecting pipe 23 connects the circulating water tank 14 and the bottom of the diatomaceous earth tank 21 to each other. Stop valves 24, 24a are interposed at the bases of the tanks 14, 21, respectively.

Reference numeral 25 denotes a coating filter, which is provided with an appropriate number of closed bottom stainless steel mesh tubes 26 made of a bellows-like stretchable inclined net of about 0.1 mm below the inside of the filter. Lower inlet pipe 25
a, a filtration stock solution supply pipe 27 is provided below the diatomaceous earth tank 21.

Reference numeral 28 denotes a gutter provided below the coating filter 25 for filtering soot, ash, sodium sulfate, sodium sulfite, and sodium chloride described later in the flue gas filtered by the filter 25. The valve 28a at the lower end of the filter 25 is opened and accommodated.

Reference numeral 29 denotes a pump having a discharge port connected to the base end of the undiluted filtration solution supply pipe 27 from the diatomaceous earth tank 21 to the coating filter 25, the suction port of which is connected to the lower part of the diatomaceous earth tank 21. Supply the undiluted solution to the filter.

Reference numerals 30 and 30a denote stop valves which are interposed between the suction port and the discharge port of the pump 29 of the undiluted filtrate supply pipe 27 and are closed when the pump 29 fails or otherwise opened at other times. .

Reference numeral 31 denotes a check valve interposed between the stop valve 30a on the coating filter 25 side and the pump 29 to prevent water in the filter 25 from flowing back to the diatomaceous earth tank 21.

Reference numeral 32 denotes a solenoid valve, which is interposed in the filtration solution supply pipe 27 between the coating filter 25 and the diatomaceous earth tank 21, and guides the filtration solution in the diatomaceous earth tank 21 to the filter 25 by the pump 29.

Reference numeral 33 denotes a filtered water supply pipe, which is connected to an outlet pipe 25b above the coating filter 25, and supplies filtered water from the filter 25.

Numeral 34 denotes a pH adjusting water tank for adjusting the hydrogen ion concentration of the filtered water, which is provided in parallel with the diatomaceous earth tank 21, is equipped with a pH meter 35, and is provided with a stirrer 36 in the water tank 34.

Reference numeral 37 denotes an alkaline tank which contains the same alkaline aqueous solution as described above, has a suction port opened in the tank 37, a discharge port opened in a pH-adjusted water tank 34, and a pH meter 35 inside the tank 34. A hydrogen ion concentration is measured, an alkaline aqueous solution is supplied when it becomes acidic, and a pump 38 which operates so as to be neutral is provided, and a similar stirrer 36 is provided.

In the pH adjusting water tank 34, as shown in Chemical Formulas 3 and 4, of the sulfuric acid generated by the contact of the sulfur dioxide gas with water and air, the sulfuric acid gas reacts in the circulating water tank 14 as shown in Chemical Formula 10. Remove any remaining sulfuric acid that was not present.

[0078]

Embedded image H ₂ SO ₄ + 2NaOH → Na ₂ SO ₄ + 2H ₂ O

The ammonium bisulfite produced in Chemical Formulas 6 and 7 reacts with an aqueous ammonia solution in the tank 34 to form
To produce ammonium sulfite as shown in

[0080]

Embedded image NH ₄ HSO ₃ + NH ₄ OH → (NH ₄ ) ₂ S
O ₃ + H ₂ O

Reference numerals 39 and 40 denote branch pipes of the filtered water supply pipe 33, which branch off the distal end of the supply pipe 33 and supply filtered water to the diatomaceous earth tank 21 and the pH adjusting water tank 34, respectively.

Reference numerals 41 and 42 denote solenoid valves which are interposed in the branch pipes 39 and 40 of the filtered water supply pipe 33, respectively.
It opens and closes according to the coating process and the filtration process described below.

Reference numeral 43 denotes a solenoid valve interposed in a pipe (both not shown) connecting the upper end of the coating filter 25 and the compressor. The solenoid valve 43 supplies compressed air from the compressor to the filter 25.

Reference numeral 44 denotes a circulation treatment water return pipe, which is provided from the upper part of the pH adjustment treatment water tank 34 to the upper part of the circulation water tank 14.
4. Open the water slightly lower than the upper part, and return the clean water whose pH has been adjusted.

When performing the coating treatment, the pump 29 is turned on, the solenoid valves 32, 41 and 43 are opened, and the diatomaceous earth in the diatomaceous earth tank 21 is coated with the water in the tank 21 by the filtration solution supply pipe 27 together with the water in the tank 21. 25 to a stainless steel mesh tube 26.

Then, by opening the solenoid valve 43 and blowing compressed air from a compressor into the tube 26, diatomaceous earth is adhered to the stainless steel net and precoated.

Next, at the time of the filtration process, the pump 29 is turned on, the solenoid valves 32 and 42 are opened, and the diatomaceous earth tank 2 is opened.
The water in 1 is supplied to the coating filter 25 via the filtration stock solution supply pipe 27, and is filtered by the tube 26.

The filtered water is supplied through a solenoid valve 42 to a pH adjustment treatment water tank 34, the pH of which is adjusted, and then returned to the circulation water tank 14 by a circulation treatment water return pipe 44.

On the other hand, the soot, ash, sodium sulfite, sodium sulfate, sodium chloride, etc. left over by filtering the water through the tube 26 accumulates at the bottom of the coating filter 25 and is opened by opening the valve 28a. Receive in the receiver 28.

[0090]

Embodiment 1 In this embodiment, the smoke exhaust port 4 of the fan scrubber 1 of the above-described apparatus of the present invention is connected to a boiler having a low smoke exhaust temperature, as shown in FIG.

Reference numeral 45 denotes a boiler, which blows air by a boiler combustion blower 46 to burn heavy oil or coal and generates steam by the heat, and 47 denotes a smoke exhaust outlet thereof.

Reference numeral 48 denotes an automatic control damper which is interposed between the smoke exhaust outlet 47 and the smoke exhaust inlet 4 of the fan scrubber 1 and is controlled by a damper control motor 49 so as to always supply a constant amount of smoke.

At this time, the smoke exhausted at about 280 ° C. from the smoke exhaust outlet 47 of the boiler 45 easily evaporates water in the circulating water tank 14 sprayed from the nozzle 6 around the fan scrubber 1, and the heat of vaporization causes the water to evaporate. Cool to ~ 70 ° C.

Further, the water in the circulating water tank 14 to the plate fins of the fan scrubber 1 becomes steam, and can be put on the flue gas of the flue gas.
The output of the motor 3 can be reduced.

[0095]

Embodiment 2 In this embodiment, the smoke exhaust port 4 of the fan scrubber 1 of the apparatus of the present invention is connected to an incinerator having a high smoke exhaust temperature, as shown in FIG.

50 is polyvinyl chloride (--CH ₂ CHCl)
-) In an incinerator for incineration of _{n and the} like, high-temperature flue gas of 600 to 1200 ° C is discharged from the flue gas outlet 51, and chlorine (Cl ₂ ) is discharged from polyvinyl chloride.

Reference numeral 52 denotes a venturi-type jet scrubber.
4 and a circulating water tank 5 similar to the circulating water tank 14 connected by a connecting pipe 56a with a stop valve interposed at each base.
The water of No. 6 is injected from the nozzle 54 by the pump 15, and the outer periphery of the throttle portion is used as a gas suction portion 55.

The gas exhaust port 55 of the incinerator 50 is connected to the gas suction section 55, and the gas outlet 57 of the scrubber 52 is connected to the smoke exhaust port 4 of the fan scrubber 1.

Then, the high-temperature smoke discharged from the incinerator 50 sucked from the gas suction part 55 is dispersed and absorbed by the nozzle 54 into the jet water of the fine droplets which has become a high-speed airflow at the throttle part, and the smoke is discharged. Dust particles collide and adhere.

The high-temperature smoke is discharged from the jet scrubber 52.
Is dispersed and absorbed in the jet water of a large amount of fine droplets jetted in the above, the jet water easily evaporates and becomes water vapor, and the smoke exhaust temperature at the gas outlet 57 is equal to the temperature at the smoke exhaust outlet 47 of the boiler 45. It can be.

Further, chlorine generated from polyvinyl chloride is converted into hydrogen chloride as shown in Chemical formula 12, and the inside of the circulating water tank 56 shows an acidity of about pH 6.5. Supply.

Then, as shown in Chemical formula 13, it can be removed as sodium chloride (NaCl) or the like by sodium hydroxide or the like in the circulating water tank 56.

[0103]

Embedded image 2Cl ₂ + 2H ₂ O → 4HCl + O ₂

[0104]

Embedded image HCl + NaOH → NaCl + H ₂ O

The carbon dioxide (C) generated in the incinerator 50
O ₂ ) reacts with sodium hydroxide or the like to produce sodium carbonate (Na ₂ CO ₃ ) or the like as shown in Chemical Formula 14, and this sodium carbonate or the like dissociates to form a circulating water tank 56 as shown in Chemical Formulas 15 and 16. Hydrogen chloride and sulfurous acid gas are removed, and the consumption of alkali such as sodium hydroxide can be reduced.

[0106]

Embedded image 2NaOH + CO ₂ → Na ₂ CO ₃ + H ₂ O

[0107]

Embedded image Na ₂ CO ₃ + 2HCl → 2NaCl + CO ₂ + H ₂ O

[0108]

Embedded image 2Na ₂ CO ₃ + 2SO ₂ + O ₂ → 2Na ₂
SO ₄ + 2CO ₂

Then, the lower part of the circulating water tank 56 is connected to the undiluted solution supply pipe 27 of the coating filter 25. In this case, carbon and ash in the sewage in the circulating water tank 56 are used as a coating agent.

[0110]

According to the present invention, as described above, the smoke exhaust port 5 of the fan scrubber 1 having the water injection nozzle 6 provided on the periphery thereof is provided.
A filter combining stainless steel or polypropylene, heat-resistant polypropylene, vinylidene fluoride, Teflon and other resin meshes on the front,
Or a crushed resin product, a case-type filter 10 using a mesh filled with ceramic balls or crushed products, or the like 10,
A water injection nozzle 11 for injecting water in the direction of the smoke exhaust inlet 8 is provided at the front and rear portions of the filter 10, and a gas-liquid separator for separating water and smoke by the water spray and injection nozzles 6 and 11 at an intermediate portion. 12 and a gas scrubber 7 provided with a chimney 13 at the rear thereof for discharging smoke discharged from the gas-liquid separator 12 into the atmosphere.

Further, discharge pipes 18, 19, for discharging water sprayed or jetted or water separated from flue gas at the lower end of the front and intermediate portions of the fan scrubber 1 and the gas scrubber 7.
A circulating water tank 14 with 20 is provided below the gas scrubber 7.

Next, a diatomaceous earth tank 21 filled with diatomaceous earth connected by a communication pipe 22 at the top and bottom of the circulating water tank 14 and a connection pipe 23 with valves 24 and 24a interposed at both ends is provided. A pH adjusting water tank 34 for supplying alkali in an alkali tank 37 is provided in parallel.

Further, the filtrate is supplied from the lower part of the diatomaceous earth tank 21 to the coating filter 25 having a built-in stainless steel mesh tube 26 through the filtrate supply pipe 27 by the pump 29, and the filtered water is supplied through the solenoid valves 41 and 42. The water is supplied to the diatomaceous earth tank 21 and the pH adjustment processing water tank 34.

The circulation treatment return pipe 44 is provided at the upper part of the pH adjustment treatment water tank 34 and the upper part of the circulation water tank 14, so that the filtered clean water is subjected to the pH adjustment treatment and returned to the circulation water tank 14. The device itself is simple, small, and inexpensive.

By utilizing the device of the present invention, desulfurization,
The dechlorination and dehydrochlorination effects and deodorization and dust collection efficiency are extremely high at 99% or more, making it possible to make sufficient contact between water and smoke, removing soot, ash and other medium dust from the chimney 13. Black smoke is not mixed in the smoke of the garbage.

Further, since water does not splash on the plate fins of the fan scrubber 1, the shaft power of the fan scrubber 1 can be reduced, and the fan scrubber 1 sprays water and puts it on the flue of the flue gas as steam by the heat of the flue gas. The pressure loss is low and the operating cost is low.

Further, circulating water containing sulfides, salts, and the like generated by the reaction of the soot and ash dust and the sulfur dioxide gas and chlorine in the circulating water with the alkali in the circulating water is passed through a coating filter 25 precoated with diatomaceous earth. Therefore, they are separated from the circulating water by the filter 25 and
8 and removes circulating water without causing secondary pollution.

As a result, dusts, sulfides, salts and the like are not clogged in the various pipes, and the circulating water is passed through the ceramic filter 16 and subjected to ceramic treatment.
The scale can be prevented from adhering to the pipe and the adhered scale can be peeled off, thereby preventing blockage of the pipeline.

In the apparatus of the present invention, sodium hypochlorite or chlorine dioxide is sprayed and sprayed from the nozzles 6 and 11 of the fan scrubber 1 and the gas scrubber 7 to clean and deodorize smoke exhaust or odors from odor sources. Since the function is provided, there is no need to separately install a deodorizing treatment device, and the exhaust gas treatment device can be provided compactly and inexpensively.

Further, the circulating water which has been ceramic-treated with silicon dioxide generates active oxygen, so that a deodorizing or oxidizing effect can be obtained, and the deodorizing or oxidizing effect by adding the respective chemicals can be further promoted.

[Brief description of the drawings]

FIG. 1 is a front view of the device of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a piping diagram when the device of the present invention is used in a boiler.

FIG. 4 is a main part piping diagram when used in the incinerator.

[Explanation of symbols]

 Reference Signs List 1 fan scrubber 2 base 3 motor 4 smoke exhaust inlet 5 smoke exhaust outlet 5a flange 6 spray nozzle 7 gas scrubber 8 smoke exhaust inlet 8a flange 9 connecting pipe 9a, 9b flange 10 filter 11 injection nozzle 12 gas-liquid separator 13 Chimney 14 Circulating water tank 15 Pump 15a Circulating water supply pipe 16 Ceramic filter 16a Bypass 17 Stop valve 18, 19, 20 Drain pipe 21 Diatomaceous earth tank 22 Communication pipe 23 Connecting pipe 24, 24a Stop valve 25 Coating filter 25a Inlet pipe 25b Exit Pipe 26 Stainless steel mesh tube 27 Filtration stock solution supply pipe 28 Backwash 28a Valve 29 Pump 30, 30a Stop valve 31 Check valve 32 Solenoid valve 33 Filtration water supply pipe 34 pH adjustment water tank 35 pH meter 36 Stirrer 37 Alkaline water tankReference Signs List 8 pump 39, 40 branch pipe 41, 42, 43 solenoid valve 44 circulating water return pipe 45 boiler 46 boiler combustion blower 47 smoke exhaust outlet 48 automatic control damper 49 damper control motor 50 incinerator 51 smoke exhaust port 52 venturi type jet scrubber 53 Venturi pipe 54 Nozzle 55 Gas inlet 56 Circulating water tank 56a Connecting pipe 57 Gas outlet

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 53/77 ZAB

Claims (5)

(57) [Claims] 1. A fan scrubber having a smoke exhaust or odor suction port and having a nozzle for spraying water from the surroundings is provided, and a stainless steel or polypropylene or heat-resistant polypropylene is provided at the front of the discharge port of the fan scrubber. ,
A filter combining different resin meshes such as vinylidene fluoride and Teflon, or a case-type filter using a resin crushed product, a ceramic ball or a mesh filled with crushed products, etc., is provided before and after the filter. A gas scrubber equipped with a nozzle for spraying water in the direction of the smoke exhaust port in front, a gas-liquid separator provided in the middle, and a chimney for discharging smoke is provided in the rear, and water is provided below the gas scrubber A circulating water tank containing an aqueous solution of sodium oxide, the same calcium, the same magnesium, ammonia, etc. is provided, and a pump and a circulating water supply pipe interposed with a ceramic filter are provided to connect the respective nozzles and the lower part of the circulating water tank,
A wet scrubbing backwash continuous scrubber, wherein a drain pipe is provided from an intermediate portion to the circulation water tank before the fan scrubber and the gas scrubber. 2. It has a deodorizing function of cleaning hydrogen sulfide, methyl mercaptan, methyl sulfide and other malodorous substances in flue gas or malodor with a fan scrubber or a gas scrubber with sodium hypochlorite or chlorine dioxide to perform oxidative decomposition. A continuous scrubber for wet washing, filtering and backwashing, characterized in that 3. A diatomaceous earth tank filled with diatomaceous earth, wherein the upper part of the circulating water tank and the upper part thereof are connected by a communication pipe, and a connecting pipe is provided at the bottom of the circulating water tank and the diatomaceous earth tank via a valve, and the diatomaceous earth is provided therein. Provide a coating filter with a built-in stainless steel mesh tube coded, a filtration solution supply pipe connecting the lower part of the diatomaceous earth tank and the lower part of the coating filter via a valve and a pump, a diatomaceous earth tank and an upper part of the coating filter To the pH adjustment treatment tank
3. A continuous wet-washing / filtration backwash according to claim 1 or 2, wherein a filtered water supply pipe is provided with a valve interposed therebetween, and a drainage treatment is performed by providing a clean water return pipe from the pH adjustment treatment water tank to the circulating water tank. Scrubber. 4. The continuous backwashing process according to claim 1, wherein the exhaust gas inlet of the fan scrubber and the exhaust gas outlet of the boiler are connected via an automatic control damper. Scrubber. 5. The wet-cleaning filtration reverse according to claim 1, wherein the exhaust gas inlet of the fan scrubber and the exhaust gas outlet of the incinerator are connected via a venturi-type jet scrubber. Washing continuous scrubber.