JP2005066505A - Exhaust gas treatment equipment and treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide exhaust gas treatment equipment which is capable of eliminating sulfur oxide in exhaust gas by using activated carbon fiber and does not cause the clogging of the activated carbon fiber even when seawater is used. <P>SOLUTION: Exhaust gas is humidified with seawater and the sulfur oxide, water and oxygen in the humidified exhaust gas are reacted by using the activated carbon fiber to produce dilute sulfuric acid. The dilute sulfuric acid discharged from the activated carbon fiber is reacted with calcium in the seawater to prepare calcium sulfate, the prepared calcium sulfate is eliminated from the seawater and the activated carbon fiber is washed by the seawater from which the calcium sulfate is eliminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

In particular, the present invention relates to sulfur oxides (SO _x ) in exhaust gas discharged from diesel engines, boilers, etc. that burn various fuels installed or installed on ships, offshore structures or fresh islands where fresh water is precious. The present invention relates to an exhaust gas treatment apparatus or a treatment method to be removed.

FIG. 7 illustrates an example of a conventional exhaust gas treatment by a land-based flue gas treatment system.
In FIG. 7, reference numeral 81 is a boiler, 82 is a denitration device, 83 is an air preheater, 84 is a dust collector, 85 is a gas / gas heater, 86 is a desulfurization device, and 87 is a chimney.
As shown in FIG. 7, a denitration device 82 using a catalyst is provided at the outlet of the boiler 81 and the like, and an air preheater 83 is installed at the outlet of the denitration device 82 to reduce the exhaust gas temperature to about 130 ° C. I have to.

The exhaust gas that has passed through the air preheater 83 is collected by the dust collector 84 and then guided to the desulfurization device 86 via the gas / gas heater 85 where sulfur oxides (SO _x ) are removed. After that, exhaust gas is discharged from the chimney 87 into the atmosphere.

Conventionally, as a main method for removing sulfur oxide (SO _x ) in exhaust gas with the desulfurization device 86, so-called gypsum is obtained by absorbing the sulfur oxide (SO _x ) using calcium carbonate as an absorbent. The lime-gypsum method is used. In this method, the concentration of sulfur oxide (SO _x ) at the outlet is reduced by variously changing the gas-liquid ratio, residence time, and the like.
However, the above-described conventional exhaust gas treatment apparatus has a problem that a large amount of absorbent is required to remove sulfur oxides.

Then, what uses activated carbon fiber as shown in FIG. 8 is proposed.
In FIG. 8, reference numeral 91 is a boiler, 92 is a denitration device, 93 is an air preheater, 94 is a dust collector, 95 is a gas / gas heater, 96 is a desulfurization device, 97 is a chimney, and 98 is a deep sulfuric acid tower. To do.

As shown in FIG. 8, the exhaust gas discharged from the boiler 91 removes nitrogen oxide (NO _x ) and sulfur oxide (SO _x ) in the exhaust gas in the denitration device 92 and the desulfurization device 96 in the same manner as described above. I am doing so.
Thereafter, the reaction is promoted by contacting the activated carbon fiber (ACF) that is guided to the deep sulfuric acid tower 98 and heat-treated in the temperature range of 600 to 1000 ° C. filled in the apparatus 98.

In the case of removing this sulfur oxide (SO _x ), a salt such as sodium sulfate instead of sulfuric acid is obtained by reacting with an aqueous solution such as sodium hydroxide instead of water in the high-depth sulfuric acid tower 98. Can also be recovered.

Here, the heat-treated activated carbon fiber packed in the high-depth sulfuric acid tower 98 is obtained by firing pitch-based carbon fiber obtained by melt spinning a pitch produced as a residue of coal / petrochemicals under a reducing atmosphere condition. Is. (For example, see Patent Document 1)
However, although the thing of the above-mentioned FIG. 7 requires a lot of fresh water in order to wash | clean activated carbon fiber, there exists a problem that adoption is difficult for the ship with the quantity of fresh water having restrictions.
In the exhaust gas treatment apparatus shown in FIG. 8 described above, it is also disclosed that an aqueous solution such as sodium hydroxide is used instead of fresh water.

  And when this exhaust gas treatment device is installed on a ship, a remote island, etc., we want to use seawater as a substitute for water or an aqueous sodium hydroxide solution, but when seawater is used for cleaning activated carbon fibers, There arises a problem that ions or the like react on the activated carbon fiber to deposit a solid, which may cause the activated carbon fiber to be clogged.

Japanese Patent No. 3272366 (2nd, 5th page, FIG. 1 and FIG. 10)

  The present invention has been proposed in order to solve the above-described problems. In the exhaust gas treatment apparatus or the exhaust gas treatment method, the activated carbon fiber is used to remove sulfur oxides in the exhaust gas and It is an object of the present invention to provide an exhaust gas treatment apparatus, a treatment method, or a desulfurization catalyst washing method used for the active carbon fiber that does not cause clogging even when seawater is used for washing the carbon fiber.

  In the exhaust gas treatment method according to the first means, the exhaust gas containing sulfur oxide is humidified with seawater, the humidified exhaust gas is reacted with a catalyst to produce diluted sulfuric acid, and the diluted sulfuric acid discharged from the catalyst And calcium contained in the seawater to produce calcium sulfate, the produced calcium sulfate is removed from the seawater, and the seawater from which the calcium sulfate has been removed is sprinkled from above the catalyst. And

  The exhaust gas treatment method according to the second means is characterized in that, in the first means, the catalyst is activated carbon fiber.

  According to the exhaust gas treatment method according to the first means and the second means described above, in exhaust gas treatment using a catalyst, seawater can be used instead of fresh water, and calcium or the like can be used for cleaning the catalyst. Since seawater from which ions are removed is used, solids do not clog the catalyst and cause clogging.

  An exhaust gas treatment apparatus according to a third means includes a reaction tower into which an exhaust gas containing sulfur oxide is introduced, and a sulfur oxide in the exhaust gas that is disposed in the reaction tower and reacts with water and oxygen. An activated carbon fiber that generates dilute sulfuric acid, a circulating water sprayer that is disposed upstream of the activated carbon fiber exhaust gas to humidify the exhaust gas, and an activated carbon fiber disposed downstream of the activated carbon fiber exhaust gas. A neutralized seawater sprayer to be cleaned, a storage tank for storing dilute sulfuric acid and seawater formed and generated at the bottom of the reaction tower, a seawater supply line for supplying seawater to the storage tank, and the inside of the storage tank A reaction tower circulation line that supplies the stored liquid to the circulating water sprayer, and the stored water in the storage tank is supplied through the reaction tower circulation line and seawater is supplied through the seawater introduction line. PH adjustment tank that neutralizes seawater The neutralized seawater the PH adjusting vessel, characterized in that a neutralizing seawater circulation line supplied to the neutralization seawater dispenser.

  According to the exhaust gas treatment apparatus according to the third means, the exhaust gas is desulfurized on the activated carbon fiber, and ions such as calcium are removed from the seawater in the storage tank or the PH adjustment tank. That is, since seawater is mainly used for the operation of the exhaust gas treatment device, the exhaust gas is effectively desulfurized even in areas and places where fresh water resources are scarce.

  In addition, since the activated carbon fiber is washed with seawater from which ions such as calcium are removed, solid matter is not generated on the activated carbon fiber, and the activated carbon fiber is not clogged.

The exhaust gas treatment apparatus according to the fourth means is characterized in that, in the third means, a filter for removing calcium sulfate generated in the neutralized seawater circulation line is provided.
According to the exhaust gas treatment apparatus according to the fourth means described above, fine solids contained in the seawater supplied to the activated carbon fibers of the reaction tower are removed by the filter.

An exhaust gas treatment apparatus according to a fifth means includes, in the third means, a wastewater treatment tank for storing the supernatant liquid of the PH adjustment tank, and a drainage pump for discharging the wastewater from the wastewater treatment tank. A Japanese seawater supply line is connected to the upper part of the PH adjustment tank.
According to the exhaust gas treatment apparatus according to the fifth means, the seawater supplied to the activated carbon fiber of the reaction tower is pH-adjusted to remove ions such as calcium, and ions such as calcium and sulfur oxides in the exhaust gas. Sulfates such as calcium sulfate produced by the above are discharged out of the apparatus by a drain pump.

An exhaust gas treatment apparatus according to a sixth means includes, in the third means, a supernatant liquid tank for storing a supernatant liquid of the PH adjustment tank, and a drain pump for discharging waste liquid from a lower portion of the PH adjustment tank. In addition, the neutralized seawater supply line is connected to a supernatant tank.
According to the exhaust gas treatment apparatus according to the sixth means, the seawater supplied to the activated carbon fiber of the reaction tower is pH-adjusted to remove ions such as calcium and the like, by ions such as calcium and sulfur oxides in the exhaust gas. The produced sulfate such as calcium sulfate is discharged out of the apparatus by a drain pump.

An exhaust gas treatment apparatus according to a seventh means is characterized in that, in any of the third to sixth means, a cooler is provided between the activated carbon fiber and the circulating water sprayer.
According to the exhaust gas treatment apparatus according to the seventh means, since the exhaust gas humidified by the cooler is cooled and introduced into the activated carbon fiber, the solubility of sulfates such as calcium sulfate is increased, and the activated carbon fiber is Precipitation of sulfate is prevented.

  According to the first and second aspects of the invention, seawater can be used instead of fresh water in the exhaust gas treatment using the catalyst. In addition, since seawater from which ions such as calcium are removed is used for cleaning the catalyst, solid matter is not clogged with the catalyst and clogging is prevented.

  According to the invention described in claim 3, in the exhaust gas treatment device, the exhaust gas is desulfurized on the activated carbon fiber, and ions such as calcium are removed from the seawater in the storage tank or the PH adjustment tank. That is, since seawater is mainly used for the operation of the exhaust gas treatment device, it is possible to effectively desulfurize the exhaust gas even in regions and places where fresh water resources are scarce.

  In addition, since the activated carbon fiber is washed with seawater from which ions such as calcium are removed, no solid matter is generated on the activated carbon fiber, and the activated carbon fiber is not clogged.

  According to the invention described in claim 4, in the exhaust gas treatment apparatus, fine solids contained in the seawater supplied to the activated carbon fibers of the reaction tower are removed by the filter, so that the activated carbon fibers are clogged. It becomes difficult.

  According to the invention described in claim 5, in the exhaust gas treatment apparatus, the seawater supplied to the activated carbon fiber of the reaction tower can be adjusted in pH to remove ions such as calcium, and muons such as calcium Sulfates such as calcium sulfate produced by sulfur oxides in the exhaust gas can be discharged out of the apparatus by a drain pump.

  According to the invention described in claim 6, in the exhaust gas treatment apparatus, the seawater supplied to the activated carbon fiber of the reaction tower can be adjusted in pH to remove ions such as calcium. And sulfates, such as calcium sulfate produced | generated by the ions, such as calcium, and the sulfur oxide in exhaust gas, can be discharged | emitted out of an apparatus with a drainage pump.

  According to the invention of claim 7, in the exhaust gas treatment device, the exhaust gas humidified by the cooler is cooled and introduced into the activated carbon fiber, so that the solubility of sulfates such as calcium sulfate is increased, and the activated carbon Precipitation of sulfate on the fiber can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an exhaust gas treatment apparatus according to the first embodiment of the present invention, and FIG. 2 is a diagram showing control in the exhaust gas treatment apparatus according to the first embodiment of the present invention.

  FIG. 3 is a view showing an exhaust gas treatment apparatus according to the second embodiment of the present invention, FIG. 4 is a view showing an exhaust gas treatment apparatus according to the third embodiment of the present invention, and FIG. 5 is a fourth view of the present invention. FIG. 6 shows an exhaust gas treatment apparatus according to the fifth embodiment of the present invention. FIG. 6 shows an exhaust gas treatment apparatus according to the fifth embodiment of the present invention.

First, an exhaust gas treatment apparatus according to the first embodiment of the present invention will be described with reference to FIG.
A marine structure such as a ship is equipped with a diesel engine 1 for propulsion or generator as shown in FIG. Exhaust gas from the diesel engine 1 passes through the flue 2, the exhaust gas processing device, the flue 4 and the chimney 5 and is discharged out of the ship. Normally, this exhaust gas contains about 1000 ppm of sulfur oxide (SO ₂ , SO ₃ ), about 10% oxygen, carbon dioxide, nitrogen, and water.

  The exhaust gas treatment apparatus is provided with a reaction tower 3. A storage tank for storing a liquid generated by purifying the exhaust gas is formed at the lower part of the reaction tower 3.

  A flue 2 is connected above the storage tank of the reaction tower 3, and a circulating water sprayer 6 for spraying circulating water into the exhaust gas is disposed in the middle of the flue 2 to increase and cool the exhaust gas. Has been. The exhaust gas from the diesel engine 1 is washed with dust and the like by the circulating water sprayed from the circulating water sprayer 6, is cooled and humidified, and is introduced into the reaction tower 3.

Above the reaction tower 3, a catalyst layer 8 such as activated carbon fiber (ACF) that has been heat-treated in a temperature range of 600 to 1000 ° C. is disposed.
The heat-treated activated carbon fiber is preferably obtained by firing pitch-based carbon fiber obtained by melt spinning a pitch produced as a coal / petrochemical residue under a reducing atmosphere condition.

Below this catalyst layer 8 is disposed a circulating water sprayer 7 for spraying circulating water into the exhaust gas in order to clean the exhaust gas and lower the temperature and humidify. The exhaust gas introduced into the reaction tower 3 is washed again. The temperature is lowered and humidified.
Further, a neutralized seawater sprayer 9 for spraying neutralized seawater whose components are adjusted as will be described later is disposed above the catalyst layer 8 to wash the catalyst layer 8.

In the above configuration, sulfur oxides (SO ₂ , SO ₃ ) in the exhaust gas introduced into the reaction tower 3 are partially removed by the circulating water sprayers 6, 7, but the remaining sulfur oxides are The activated carbon fiber (ACF) catalyst layer 8 reacts with oxygen in the exhaust gas, moisture in the exhaust gas, moisture humidified by the sprayers 6 and 7, or water from the neutralized seawater sprayer 9 to dilute sulfuric acid. Is generated.
The dilute sulfuric acid formed in the catalyst layer 8 is washed away by the component-adjusted neutralized seawater sprayed from the neutralized seawater sprayer 9 and falls into the storage tank below the reaction tower 3.

Thereafter, the dilute sulfuric acid reacts with calcium ions, magnesium ions, sodium ions, potassium ions, etc. (hereinafter collectively referred to as “calcium ions, etc.”) in the seawater in the storage tank at the lower part of the reaction tower 3 and sulfuric acid. Sulfates of calcium, magnesium sulfate, sodium sulfate, and potassium sulfate (hereinafter collectively referred to as “calcium sulfate and the like”) are formed.
As described above, since the seawater sprayed from the neutralized seawater sprayer 9 is adjusted to remove calcium ions and the like as will be described later, the calcium sulfate in the catalyst layer 8 such as activated carbon fiber (ACF) is removed. And the like sulfates are not formed.

  On the other hand, the exhaust gas from which the sulfur oxide has been removed by the catalyst layer 8 such as activated carbon fiber (ACF) passes through the flue 4 and the chimney 5 and is discharged to the outside.

Next, various liquid supply, circulation, and replenishment lines connected to the reaction tower 3 will be described.
The reaction tower 3 includes a reaction tower circulation line 20 that circulates seawater in a storage tank below the reaction tower 3, a seawater supply line 30 that supplies seawater, and neutralized seawater that supplies component-adjusted neutralized seawater. A circulation line 40 and a fresh water supply line 50 for supplying fresh water are connected.

  That is, the seawater outside the ship is not directly sprinkled on the activated carbon fiber that is the catalyst in the reaction tower 3, but the PH adjustment tank 10 is provided, and the pH and components are adjusted by the PH adjustment tank 10, and the adjusted medium is adjusted. Japanese seawater is sprinkled into the reaction tower 3 from the neutralized seawater sprayer 9.

First, the reaction tower circulation line 20 will be described.
In the reaction tower circulation line 20, seawater containing sulfate such as calcium sulfate, dilute sulfuric acid, etc., stored in a storage tank below the reaction tower 3 is sucked by a reaction tower circulation pump 21 through a pipe 22.

Part of the seawater sucked by the reaction tower circulation pump 21 is supplied to the circulating water spreader 6 disposed in the middle of the flue 2 via the remote control valve 26 and the pipe 23. A part of the seawater is supplied to the circulating water spreader 7 disposed in the reaction tower 3 via the remote control valve 27 and the pipe 24.
Further, a pipe 25 for discharging seawater to the PH adjusting tank 10 is connected to the discharge side of the reaction tower circulation pump 21 via a remote control valve 28.

The storage tank below the reaction tower 3 is provided with a level meter 71 (or level switch) for detecting the water level.
Then, as shown in FIG. 2, when the signal from the level meter 71 is compared with the set value by the reaction tower level controller 76a (or control circuit, control sequence) in the control panel 70 and becomes lower than the set value. The remote control valve 35 of the seawater supply line 30 to be described later is opened to supply seawater, or the amount of seawater supplied is increased.

Next, the seawater supply line 30 will be described.
Seawater is sucked in via a pipe 32 by a seawater supply pump 31 from a seawater inlet provided on the bottom 14 of the ship. The sucked seawater is introduced into a position below the catalyst layer 8 of the reaction tower 3 through the remote control valve 35 and the pipe 34. Further, a part of the sucked seawater is sent to the PH adjustment tank 10 via the remote control valve 36 and the pipe 33.

As described above, seawater containing sulfate such as dilute sulfuric acid, calcium sulfate, and magnesium sulfate is transferred to the PH adjustment tank 10 through the reaction tower circulation line 20, and ions such as calcium are contained through the seawater supply line 30. External seawater is supplied.
In the PH adjustment tank (neutralization tank) 10, the remaining dilute sulfuric acid reacts with ions such as calcium ions, magnesium ions, and sodium in seawater, and sulfates such as calcium sulfate, magnesium sulfate, and sodium sulfate are generated.

  Then, the generated sulfate such as calcium sulfate is deposited as a solid, and is deposited on the bottom of the PH adjusting tank 10. On the other hand, the supernatant liquid is a neutralized liquid (neutralized seawater) that does not contain calcium ions or the like.

In this case, a PH meter 73 is installed in the PH adjustment tank 10 to detect whether or not the acidity (PH) of the liquid in the PH adjustment tank 10 is neutralized.
As shown in FIG. 2, the signal from the PH meter is sent to a PH adjuster (or control circuit, control sequence) 76b in the control panel 70.
The PH adjuster 76b compares the input PH value with a preset setting value (preferably PH = 7.0). If the PH value is lower than a predetermined value, the seawater from the seawater supply line 30 is When the PH value is high, the opening degree of the remote control valve 36 is controlled so as to decrease the amount of seawater.

Next, the neutralized seawater circulation line 40 will be described.
The neutralized seawater circulation line 40 is a line for sending the neutralized seawater whose components have been adjusted in the PH adjustment tank 10 to the neutralized seawater sprayer 9 disposed in the upper part of the reaction tower 3 as a cleaning liquid for the catalyst layer 8. It is.

  The neutralized seawater in which the components in the PH adjustment tank 10 are adjusted is sucked by the neutralized seawater circulation pump 41. The neutralized seawater sucked is sent to the neutralized seawater sprayer 9 in the reaction tower 3 through the pipes 44 and 45 and the remote control valve 49.

  Further, two filters 48 a and 48 b and two sets of remote control valves 47 a and 47 b are inserted in the middle of the pipe 44 in order to prevent the solid matter from being transferred to the neutralized seawater spreader 9. Two sets are provided in order to use one set and to clean and maintain the other set.

  Further, a remote control valve 46 and a pipe 43 are connected to the pipe 44 between the neutralized seawater circulation pump 41 and the filters 48a and 48b. Excess neutralized seawater is discharged outside the ship through the pipe 43. Is done. The pipe 43 and the remote control valve 46 may be connected to the downstream side of the filters 48a and 48b.

  Further, the PH adjustment tank 10 is provided with a level meter (or level switch) 72 that detects the water level of the PH adjustment tank 10. As shown in FIG. 2, the water level detected by the level meter 72 is transmitted to the PH adjustment tank level controller (or control circuit, control sequence) 76 c in the control panel 70. The PH adjustment tank level controller 76c compares the input water level with a preset set value, and when the input water level becomes larger than the set value, the remote control valve 46 is opened to neutralize seawater. Discharge outboard.

  On the other hand, a fresh water supply line 50 is connected to the downstream side of the remote control valve 49 of the neutralized seawater circulation line 40. The fresh water supply line 50 includes a fresh water tank 52, a fresh water supply pump 51 for supplying fresh water from the fresh water tank 52, a pipe 53, and a remote control valve 54.

The flue 4 is provided with a sulfur oxide concentration meter 75. Based on the sulfur oxide concentration detected by the sulfur oxide concentration meter 75, the amount of fresh water to be replenished is calculated, and the remote control valve 54 and the remote control valve 49 of the neutralized seawater circulation line 40 are controlled.
That is, as shown in FIG. 2, the sulfur oxide concentration meter 75 detects the sulfur oxide concentration in the exhaust gas in the flue 4, and the detection signal is a desulfurization performance controller (or control) in the control panel 70. The desulfurization performance controller 76d transmitted to the circuit and control sequence 76d compares the input concentration with a preset set value, and when the input concentration is higher than the set value, the fresh water replenishment line 50 The remote control valve 54 is opened, and the opening degree of the remote control valve 49 in the neutralized seawater circulation line 40 is increased.

Although the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to the above-described embodiment, and various modifications may be made to the specific structure within the scope of the present invention. Nor.
For example, the fresh water supply line 50 may be connected to a place other than the pipe 45.

Further, the pipe 43 for draining outside the ship is not connected to the upstream side of the filters 48a and 48b, but is connected to the downstream side of the filters 48a and 48b, and the solid matter is removed by the filters 48a and 48b and then discharged. You may do it.
Further, the two filters 48a and 48b and the two sets of remote control valves 47a and 47b are disposed on the discharge port side of the neutralized seawater circulation pump 41, but are disposed on the pipe 42 on the suction port side. Anyway.
As for the valves, only the valves 35, 36, 46, 54, and 49 that require remote control or automatic control shown in FIG. 2 may be remote control valves, and the other valves may be manual valves. Furthermore, in a small-scale exhaust gas treatment apparatus, it is possible to use all manual valves.
It is also possible to form the PH adjusting tank 10 integrally with the reaction tower 3.

Next, an exhaust gas processing apparatus according to a second embodiment of the present invention will be described with reference to FIG.
In FIG. 3, the same parts as those in the first embodiment are denoted by the same reference numerals. Further, description of the same parts as those in the first embodiment is omitted, and differences from the first embodiment will be described.
In the second embodiment, the reaction tower 3, the reaction tower circulation line 20, the PH adjustment tank 10, the seawater supply line 30, and the fresh water supply line 50 are the same as those in the first embodiment.

  The difference from the first embodiment is that in the neutralized seawater circulation line 40, the filters 48a and 48b and the remote control valves 47a and 47b are omitted, and the pipe 42 is connected near the water surface in the PH adjustment tank 10, The supernatant is sucked by the neutralized seawater circulation pump 41 and sent to the neutralized seawater sprayer 9.

In this case, a drainage pump 65 and a pipe 66 are separately connected to the bottom of the PH adjustment tank 10. When the level meter 72 exceeds a predetermined value, the drain pump 65 is turned on, and excess neutralized seawater and solid matter in the PH adjustment tank 10 are discharged out of the ship.
According to the second embodiment, since the filter can be omitted, the exhaust gas treatment device can be further simplified.

Next, an exhaust gas processing apparatus according to a third embodiment of the present invention will be described with reference to FIG.
In FIG. 4, the same parts as those in the first and second embodiments are denoted by the same reference numerals. Further, description of the same parts as those in the first and second embodiments is omitted, and differences from the second embodiment will be described.
In the third embodiment, the reaction tower 3, the reaction tower circulation line 20, the seawater supply line 30 and the fresh water supply line 50 are the same as those in the second embodiment.

  The difference from the second embodiment is that a waste water treatment tank 15 is provided adjacent to the PH adjustment tank 10a. A partition wall 16 is disposed between the PH adjustment tank 10 a and the waste water treatment tank 15. An L-shaped solid baffle plate 18 is disposed on the upper portion of the partition wall 16. The intake port of the pipe 42 of the neutralized seawater circulation line 40 is connected above the solid baffle plate 18 of the partition wall 16.

  In the third embodiment, the waste liquid from the reaction tower circulation line 20 and the seawater from the seawater supply line 30 are introduced into the PH adjustment tank 10a to adjust the acidity and dilute sulfuric acid is calcium ions in the seawater. , It reacts with magnesium ions and the like to produce calcium sulfate, magnesium sulfate and the like. The produced solid matter such as magnesium sulfate is precipitated at the bottom of the pH adjusting tank 10a.

The suction side of the neutralized seawater circulation pump 41 is connected to the vicinity of the water surface of the PH adjustment tank 10a via a pipe 42.
On the other hand, the neutralized seawater overflowing from the PH adjustment tank 10 a overflows the upper end of the partition wall 16 and flows to the wastewater treatment tank 15.

  Then, when the water level in the waste water treatment tank 15 rises to some extent, the level meter 72 detects it, and the waste water pump 65 is turned on to discharge the waste liquid out of the ship.

Next, an exhaust gas processing apparatus according to a fourth embodiment of the present invention will be described with reference to FIG.
In FIG. 5, the same parts as those in the third embodiment are denoted by the same reference numerals. Further, description of the same parts as those of the third embodiment is omitted, and differences from the third embodiment will be described.
In the fourth embodiment, the reaction tower 3, the reaction tower circulation line 20, the seawater supply line 30, the fresh water replenishment line 50, the supernatant liquid tank 19, the drainage pump 65 and the like are the same as those in the third embodiment. is there.

In the fourth embodiment of the present invention, the pipe 42 on the suction port side of the neutralized seawater circulation pump 41 is connected to the bottom of the supernatant tank 19.
In addition, filters 48a and 48b and remote control valves 47a and 47b are disposed in the piping 44 on the discharge port side of the neutralized seawater circulation pump 41, as in the first embodiment.
And the solid substance in PH adjustment tank 10a is suck | inhaled with the neutralization seawater circulation pump 41 with the neutralization seawater, and is collect | recovered by the filters 48a and 48b.

An exhaust gas treatment apparatus according to a fifth embodiment of the present invention will be described with reference to FIG.
In FIG. 6, the same parts as those in the fourth embodiment are denoted by the same reference numerals. Further, the description of the same parts as those in the fourth embodiment will be omitted, and differences from the fourth embodiment will be described.

  In the fifth embodiment, the reaction tower 3, the reaction tower circulation line 20, the seawater supply line 30, the neutralized seawater circulation line 40, the fresh water supply line 50, the PH adjustment tank 10 a, the supernatant liquid tank 19, and the drainage pump 65. Etc. are the same as those in the fourth embodiment.

In the fifth embodiment, a cooler 17 is disposed between the catalyst layer 8 in the reaction tower 3 and the circulating water sprayer 7. The cooler 17 is connected to the discharge port of the seawater supply pump 31 via a cooling line 60 including a pipe 61 and a remote control valve 62.
Thereby, since the exhaust gas introduced into the catalyst layer 8 is cooled, the reaction in the catalyst 8 is further promoted. The water temperature is desirably 40 ° C. or lower.

  Note that a system different from the seawater supply line 30 may be used, and a dedicated cooling water pump may be provided to send the cooling water to the cooler 17. Moreover, you may make it supply cooling water from the other apparatus arrange | positioned in a ship and a marine structure.

  The first to fifth embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made to the specific structure within the scope of the present invention. Needless to say.

1 is a view showing a marine exhaust gas treatment apparatus according to a first embodiment of the present invention. It is a figure which shows the control content of the marine exhaust gas processing apparatus which is the 1st Embodiment of this invention. It is a figure which shows the marine exhaust gas processing apparatus which is the 2nd Embodiment of this invention. It is a figure which shows the marine exhaust gas processing apparatus which is the 3rd Embodiment of this invention. It is a figure which shows the marine exhaust gas processing apparatus which is the 4th Embodiment of this invention. It is a figure which shows the marine exhaust gas processing apparatus which is the 5th Embodiment of this invention. It is a figure which shows the conventional land exhaust gas processing apparatus. It is a figure which shows the other example of the conventional on-land waste gas processing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diesel engine 2 Flue 3 Reaction tower 4 Flue 5 Chimney 6, 7 Circulating water spreader 8 Catalyst layer 9 Neutralization seawater spreader 10, 10a PH adjustment tank 14 Ship bottom 15 Waste water treatment tank 16 Partition wall 17 Cooler 18 Jam Plate 19 Supernatant tank 20 Reaction tower circulation line 21 Reaction tower circulation pump 22, 23, 24, 25 Piping 26, 27, 28 Remote control valve 30 Seawater supply line 31 Seawater supply pump 32, 33, 34 Piping 35, 36 Remote Operation valve 40 Neutralization seawater circulation line 41 Neutralization seawater circulation pump 42, 43, 44, 45 Piping 47a, 47b Remote operation valve 48a, 48b Filter 46, 49 Remote operation valve 50 Fresh water supply line 51 Fresh water supply pump 52 Fresh water tank 53 Piping 54 Remote control valve 60 Cooling line 61 Piping 62 Remote control valve 65 Drain pump 66 Piping 6 The remote control valve 70 control panel 71 level meter 73 and 74 PH meter 75 sulfur oxide concentration meter 76a reactor level control 76 b PH regulator 76c PH adjusting tank level controller 76d desulfurization performance controller

Claims (7)

  In the method of treating sulfur oxides in exhaust gas, the exhaust gas is humidified with seawater, the humidified exhaust gas is reacted with a catalyst to produce diluted sulfuric acid, and the diluted sulfuric acid discharged from the catalyst and the seawater An exhaust gas treatment characterized by producing calcium sulfate by reacting with calcium contained in the catalyst, removing the generated calcium sulfate from the seawater, and spraying the seawater from which the calcium sulfate has been removed from above the catalyst. Method.   The exhaust gas treatment method according to claim 1, wherein the catalyst is activated carbon fiber.   In an exhaust gas treatment apparatus, a reaction tower into which an exhaust gas containing sulfur oxide is introduced, and an activity that is disposed inside the reaction tower and reacts the sulfur oxide in the exhaust gas with water and oxygen to produce dilute sulfuric acid. Carbon fiber, circulating water sprayer that is disposed upstream of the activated carbon fiber exhaust gas to humidify the exhaust gas, and neutralized seawater spray that is disposed downstream of the activated carbon fiber exhaust gas to wash the activated carbon fiber A storage tank for storing dilute sulfuric acid and seawater formed and generated at the bottom of the reactor, a seawater supply line for supplying seawater to the storage tank, and circulating the stored liquid in the storage tank A reaction tower circulation line to be supplied to a water sprayer, and a PH for neutralizing seawater by supplying the stored water in the storage tank through the reaction tower circulation line and supplying seawater through the seawater introduction line. Adjustment tank and PH Exhaust gas treatment apparatus neutralized seawater in the advice service, characterized in that a neutralizing seawater circulation line supplied to the neutralization seawater dispenser.   The exhaust gas treatment apparatus according to claim 3, further comprising a filter for removing calcium sulfate produced in the neutralized seawater circulation line.   A wastewater treatment tank for collecting supernatant liquid from the PH adjustment tank and a drainage pump for discharging waste liquid from the wastewater treatment tank, and the neutralized seawater supply line is connected to the upper part of the PH adjustment tank. The exhaust gas treatment apparatus according to claim 3.   A supernatant tank for storing the supernatant from the PH adjustment tank and a drainage pump for extracting the waste liquid from the lower part of the PH adjustment tank, and the neutralized seawater supply line is connected to the supernatant tank. The exhaust gas treatment apparatus according to claim 3. The exhaust gas treatment apparatus according to any one of claims 3 to 6, further comprising a cooler between the activated carbon fiber and the circulating water sprayer.

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