JP2012071246A - Carbon dioxide removal unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide carbon dioxide removal unit which enhances a rate of removing carbon dioxide from a gas to be treated containing carbon dioxide.SOLUTION: The carbon dioxide removal unit includes: a reaction tank 2 filled with a carbon dioxide carrier 22 to adsorb carbon dioxide and having a fluid layer of the carbon dioxide carrier 22 formed by the gas to be treated introduced from the lower part; a carrier supplying means 4 to intermittently supply the carbon dioxide carrier 22 from the upper part of the reaction tank 2; a carrier recovery part 6 to recover the carbon dioxide carrier 22 which has adsorbed carbon dioxide from the lower part of the reaction tank 2; and a carbon dioxide separation means 8 to separate carbon dioxide from the carbon dioxide carrier 22 which has been recovered by the carrier recovery part 6. The carrier supplying means 4 intermittently supplies the carbon dioxide carrier 22 from which carbon dioxide has been separated, into the reaction tank 2. The carrier recovery part 6 is provided with a carrier guide pipe 24 which communicates with the lower part of the reaction tank 2 and is filled with a recovery liquid 28 having a pressure that prevents the gas to be treated from entering.

Description

The present invention relates to a technique for removing carbon dioxide (CO ₂ ) from combustion exhaust gas and by-product gas, which is applied to a factory having a combustion furnace and a by-product gas transport piping facility in the field of mechanical technology.

In a factory having a combustion furnace, such as an ironworks, exhaust gas after combustion, which is a gas having a high ratio including carbon dioxide (CO ₂ ), is generated. In addition to the exhaust gas after combustion, by-products such as blast furnace gas, converter gas, and gas generated in a coke oven are generated in factories such as steelworks. .
These gases are diffused into the atmosphere from a chimney or the like after combustion, and processing for removing contained carbon dioxide is not generally performed.

However, since carbon dioxide contained in the above gas causes a global warming phenomenon, for example, as described in Patent Document 1, carbon dioxide is removed from the gas before being released into the atmosphere. Technology is disclosed.
The technique described in Patent Document 1 is a process of supplying a carbon dioxide gas absorbent powder that absorbs carbon dioxide (carbon dioxide) into a reaction cylinder to form a fluidized bed of the carbon dioxide absorbent powder in the reaction cylinder. And a step of discharging carbon dioxide-absorbing carbon dioxide absorbent powder unevenly distributed in the lower part of the reaction cylinder to the outside of the reaction cylinder.

  Here, in the technique described in Patent Document 1, in the step of discharging the carbon dioxide absorbent powder that has absorbed carbon dioxide to the outside of the reaction cylinder, the flow rate adjusting means provided in the discharge passage of the carbon dioxide absorbent powder is provided. By opening, carbon dioxide absorbing powder that has absorbed carbon dioxide is discharged out of the reaction cylinder.

Japanese Patent No. 3845541

  However, in the technique described in Patent Document 1, the carbon dioxide absorbent powder that has absorbed carbon dioxide is discharged out of the reaction cylinder by opening a flow rate adjusting means provided in the discharge passage of the carbon dioxide absorbent powder. ing. For this reason, the to-be-processed gas from which carbon dioxide has not been removed may move to the discharge path of the carbon dioxide gas absorbent powder, which may cause a problem that the removal rate of carbon dioxide with respect to the to-be-treated gas decreases. is there.

  This invention is made paying attention to the above problems, and makes it a subject to provide the carbon dioxide removal apparatus which can improve the removal rate of the carbon dioxide with respect to to-be-processed gas.

In order to solve the above-mentioned problem, the invention described in claim 1 is a carbon dioxide removing device that removes carbon dioxide from a gas to be treated.
A reaction tank in which a carbon dioxide carrier that adsorbs carbon dioxide is contained and a fluidized bed of the accommodated carbon dioxide carrier is formed by the gas to be treated introduced from below;
A carrier loading means for intermittently charging the carbon dioxide carrier from the upper part of the reaction vessel;
A carrier recovery unit for recovering the carbon dioxide carrier adsorbing the carbon dioxide from the lower part of the reaction tank;
Carbon dioxide separation means for separating the carbon dioxide from the carbon dioxide carrier recovered by the carrier recovery unit,
The carrier loading means intermittently throws the carbon dioxide carrier separated from the carbon dioxide by the carbon dioxide separation means, into the reaction tank in which the fluidized bed is formed,
The carrier recovery unit includes a carrier guide tube that communicates with a lower portion of the reaction tank and is filled with a liquid.
The carrier induction tube collects the carbon dioxide carrier adsorbing the carbon dioxide from one end in the liquid, and discharges the carbon dioxide carrier collected in the liquid from the other end. It is characterized by this.

According to the present invention, the carrier recovery unit that recovers the carbon dioxide carrier that has adsorbed carbon dioxide from the lower part of the reaction tank includes the carrier guide tube that communicates with the lower part of the reaction tank and is filled with liquid. Yes.
For this reason, it is suppressed that the to-be-processed gas from which carbon dioxide is not removed is moved outside the reaction tank together with the carbon dioxide carrier that has adsorbed carbon dioxide by the liquid filled in the carrier guide tube. Is possible.

Next, among the present inventions, the invention described in claim 2 is the invention described in claim 1, wherein the gas to be treated introduced from the lower part into the lower part of the reaction tank is supplied to the reaction tank. The present invention is characterized in that a dispersion plate for dispersion inside is provided.
According to the present invention, the gas to be treated introduced from the lower part is dispersed inside the reaction tank by the dispersion plate provided in the lower part of the reaction tank.
For this reason, it becomes possible to move the gas to be treated introduced from the lower part to the inside of the reaction tank with less bias, and the gas to be treated introduced from the lower part is evenly dispersed inside the reaction tank. It becomes possible.

  According to the present invention, it is possible to suppress the gas to be processed from which the carbon dioxide has not been removed from moving to the outside of the reaction tank, so that it is possible to improve the carbon dioxide removal rate with respect to the gas to be processed. It becomes possible.

It is sectional drawing which shows schematic structure of the carbon dioxide removal apparatus of this invention. FIG. 2 is a view taken along line II in FIG. 1. It is a figure which shows the modification of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, a specific configuration of the carbon dioxide removal apparatus 1 of the present embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is a cross-sectional view showing a schematic configuration of the carbon dioxide removing apparatus 1. FIG. 2 is a view taken along the line II in FIG.
As shown in FIG. 1, the carbon dioxide removing device 1 of this embodiment includes a reaction tank 2, a carrier loading unit 4, a carrier collecting unit 6, and a carbon dioxide separation unit 8.
The reaction tank 2 is formed in a cylindrical shape whose axis is directed in the vertical direction, and accommodates a carbon dioxide carrier 22 described later.

In addition, the reaction tank 2 includes a processing gas introduction part 10, a dispersion plate 12, a carrier charging hole 14, a carrier discharging hole 16, and a processed gas discharging duct 18.
The to-be-processed gas introduction part 10 is an opening part opened to the side surface in the lower part of the reaction tank 2, and is connected to a factory F such as a steel mill. Moreover, the to-be-processed gas introduction part 10 makes the to-be-processed gas which is a gas with a high ratio containing the waste gas and by-product gas which generate | occur | produced in factories F, such as a steel mill, the carbon dioxide containing the inside ratio (internal space) It is an opening for introducing into.

  Here, a plurality of target gas introduction portions 10 may be formed in one reaction tank 2 or only one. When a plurality of target gas introduction units 10 are formed in one reaction tank 2, for example, each target gas introduction unit 10 is provided with a valve that can be arbitrarily opened and closed. It is good also as a structure into which the to-be-processed gas generate | occur | produced from different facilities (factory etc.) is introduced.

Further, the flow rate of the gas to be processed that moves from the factory F to the gas to be processed introducing section 10 can be changed in the pipe P that is the movement path of the gas to be processed from the factory F to the gas to be processed introducing section 10. A flow rate change valve 20 is arranged.
When the flow velocity of the gas to be processed that moves from the factory F to the gas to be processed introducing portion 10 is changed by operating the flow velocity change valve 20, the amount of introduction (blowing amount) of the gas to be processed to the gas to be processed introducing portion 10 is changed. It becomes possible to make it. For this reason, when removing the carbon dioxide from the gas to be treated using the carbon dioxide removing apparatus 1 of the present embodiment, the amount of gas to be treated inside the reaction tank 2 is adjusted by adjusting the operation amount of the flow rate change valve 20. Adjust the flow velocity (superficial velocity).

The operation amount of the flow rate change valve 20 is the minimum speed at which the flow rate of the gas to be treated introduced into the reaction vessel 2 is the minimum speed at which fluidization occurs in the gas to be treated introduced into the reaction vessel 2. Adjust the speed to exceed the fluidization speed.
The minimum fluidization speed is set according to the shape of the reaction tank 2, the size and shape of the carbon dioxide carrier 22, the composition of the gas to be treated, and the like.

  Here, in the present embodiment, as an example, in order to adjust the operation amount of the flow rate change valve 20 so that the flow rate of the gas to be processed introduced into the reaction tank 2 exceeds the minimum fluidization rate. The case where the atmospheric pressure in the vicinity of the gas inlet 10 to be processed and the atmospheric pressure in the vicinity of the processed gas discharge duct 18 are referred to will be described. Specifically, a pressure sensor (not shown) for detecting the atmospheric pressure is disposed in the vicinity of the gas to be processed introduction portion 10 and the processed gas discharge duct 18, respectively, and the reaction tank is determined from the difference in atmospheric pressure detected by both pressure sensors. 2 is used as an index for adjusting the operation amount of the flow rate change valve 20.

Therefore, when the operation amount of the flow rate change valve 20 is adjusted as described above, the gas to be processed introduced into the reaction tank 2 through the gas to be processed introducing portion 10 is accommodated in the reaction tank 2. The carbon dioxide carrier 22 forms a fluidized bed inside the reaction vessel 2.
As shown in FIG. 2, the dispersion plate 12 is formed of, for example, a conical mesh (net) having an opening at the center and in the vicinity of the center. In addition, the dispersion plate 12 is provided in the lower part of the reaction tank 2, specifically, in the reaction tank 2, in the vicinity of the target gas introduction unit 10, and is introduced from the target gas introduction unit 10. The gas to be treated is collided and dispersed, and moved to the inside of the reaction tank 2 with little bias.

  That is, the dispersion plate 12 suppresses the gas to be treated introduced from the gas to be treated introduction unit 10 from rising along the inner wall surface of the reaction tank 2. As a result, the dispersion plate 12 uniformly disperses the gas to be processed introduced from the gas inlet 10 to be processed, that is, the lower part of the reaction tank 2, inside the reaction tank 2. In FIG. 2, illustrations other than the dispersion plate 12 are omitted for explanation.

The carrier loading hole 14 is a hole opened on the upper surface of the reaction tank 2, and is formed in a shape that allows a later-described carbon dioxide carrier 22 to be charged into the reaction tank 2.
The carrier discharge hole 16 is a hole opened in the bottom surface of the reaction tank 2, and is formed in a shape capable of discharging the carbon dioxide carrier 22 introduced into the reaction tank 2 to the outside of the reaction tank 2. ing.
The treated gas discharge duct 18 is provided above the reaction tank 2 and communicates the inside of the reaction tank 2 with equipment (such as a chimney) not shown.

  In the present embodiment, as an example, the pressure (atmospheric pressure) in the treated gas discharge duct 18 is set to be equal to or higher than atmospheric pressure and lower than the pressure in the reaction tank 2 by a booster (a pump or the like) (not shown). The case where it is adjusted will be described. This is because the pressure in the treated gas discharge duct 18 is higher than the atmospheric pressure when an opening (hole or the like) is formed in the treated gas discharge duct 18 such as when the treated gas discharge duct 18 is aged. This is because outside air flows into the reaction tank 2 when the temperature is low.

  The carrier loading means 4 is configured to include, for example, a hopper, a conveyor, and the like, and in a state where the carbon dioxide carrier 22 that adsorbs carbon dioxide is pressurized to the same pressure as the upper part of the reaction tank 2 by the gas to be treated. Then, it is intermittently charged into the reaction tank 2 in which the fluidized bed of the carbon dioxide carrier 22 is formed. As a result, the pressure of the atmosphere surrounding the carbon dioxide carrier 22 is increased, and the carbon dioxide carrier 22 introduced into the reaction vessel 2 from the carrier introduction means 4 through the carrier introduction hole 14 is moved out of the reaction vessel 2. Prevents scattering.

The amount of carbon dioxide carrier 22 charged by the carrier loading means 4 is, for example, such that a large number of carbon dioxide carriers 22 can be displaced at least in the reaction tank 2 in which the fluidized bed of carbon dioxide carrier 22 is formed. It is set as the quantity accommodated with a gap.
Here, the carbon dioxide carrier 22 is formed by, for example, a material having pores such as γ (gamma) -alumina and carrying a substance that immobilizes carbon dioxide such as an organic amine.

  Further, the carbon dioxide carrier 22 does not adsorb carbon dioxide contained in the gas to be treated, or has a small amount of carbon dioxide adsorption, and has a small specific gravity compared to a state in which carbon dioxide is sufficiently adsorbed, Due to the fluidized bed formed inside the reaction tank 2, it floats in the reaction tank 2, segregates at the upper part of the reaction tank 2, and in the state where carbon dioxide is sufficiently adsorbed, it is segregated at the lower part of the reaction tank 2. It is formed to become.

  In the present embodiment, a case will be described in which the carbon dioxide carrier 22 is formed by carrying a substance that immobilizes carbon dioxide such as organic amine on a carrier such as γ-alumina that is a spherical particle. The configuration of the carbon dioxide carrier 22 is not limited to the above-described configuration. For example, a reaction for immobilizing carbon dioxide other than solid base powder, organic amine, or the like, that is, γ-alumina occurs. It is good also as a structure formed using material.

The carrier recovery unit 6 includes a carrier guide tube 24 and a sedimentation separation tank 26.
The carrier guiding tube 24 is a communication tube that is disposed vertically below the reaction tank 2 and is filled with the recovered liquid 28. In addition, one end of the carrier guide tube 24 communicates with the inside of the reaction tank 2 through the carrier discharge hole 16, and the other end communicates with the sedimentation separation tank 26.
That is, the carrier guide tube 24 collects the carbon dioxide carrier 22 that has adsorbed carbon dioxide from one end in the recovered liquid 28 and recovers the carbon dioxide supported in the recovered liquid 28 from the other end. The body 22 is discharged.

Here, the recovery liquid 28 filled in the inside of the carrier guiding tube 24 is a liquid such as water, and the gas to be treated introduced into the reaction tank 2 from the gas to be treated introducing portion 10 is contained in the carrier guiding tube. It is pressurized to a pressure that does not penetrate into 24.
The sedimentation / separation tank 26 is a tank that stores the carbon dioxide carrier 22 and the recovered liquid 28 that have moved from the reaction tank 2 via the carrier guide tube 24, and includes a filter and a pump (not shown).

The filter is formed using, for example, a strainer or the like, and the recovered liquid 28 is filtered to take out the carbon dioxide carrier 22, fragments of the carbon dioxide carrier 22, etc. from the recovered liquid 28.
The pump guides the recovery liquid 28 filtered by the above-described filter through a recovery liquid input port (not shown) that opens in the vicinity of the gas inlet 10 under the reaction tank 2. Insert into 24 from above. That is, the recovered liquid 28 circulates through the carrier guide tube 24 and the sedimentation separation tank 26 via a filter and a pump.

As described above, the carrier recovery unit 6 recovers the carbon dioxide carrier 22 having adsorbed carbon dioxide from the lower part of the reaction tank 2.
Although not particularly illustrated, the carrier guide tube 24 includes a carbon dioxide carrier 22 that moves from the carrier guide tube 24 to the sedimentation separation tank 26 and a moving amount of the recovered liquid 28, and a recovered liquid 28 in the reaction tank 2. In order to control the liquid level position, a valve capable of changing the amount of movement of the carbon dioxide carrier 22 and the recovered liquid 28 between the carrier guide tube 24 and the sedimentation separation tank 26 is provided.

The carbon dioxide separator 8 separates carbon dioxide from the carbon dioxide carrier 22 collected by the carrier collection unit 6.
Here, the carbon dioxide separated from the carbon dioxide carrier 22 is recovered for the purpose of reuse.
The carbon dioxide carrier 22 from which carbon dioxide has been separated is subjected to treatments such as washing and drying, and then the carrier introduction means 4 introduces the carrier introduction hole into the reaction tank 2 in which a fluidized bed is formed. 14 intermittently.

That is, the carrier charging means 4 intermittently charges the carbon dioxide carrier 22 from which carbon dioxide has been separated by the carbon dioxide separation means 8 into the reaction tank 2 in which the fluidized bed is formed from above the reaction tank 2. .
Therefore, the carbon dioxide carrier 22 adsorbs carbon dioxide after being intermittently charged into the reaction tank 2 in which the fluidized bed is formed by the carrier charging means 4 in a state where carbon dioxide is not adsorbed. When the specific gravity increases, the specific gravity moves into the recovered liquid 28 in the carrier guide tube 24. Then, after moving from the carrier guide tube 24 to the sedimentation separation tank 26 and separating the adsorbed carbon dioxide by the carbon dioxide separation means 8, the carbon dioxide carrier 22 having a reduced size is removed by the separation operation, and again Then, the circulation that is intermittently charged into the reaction tank 2 by the carrier charging means 4 is repeated.

(CO2 removal method)
Next, a method for removing carbon dioxide from the gas to be treated using the carbon dioxide removal apparatus 1 of the present embodiment (hereinafter referred to as “carbon dioxide removal”) will be described with reference to FIGS. 1 and 2. .
In the carbon dioxide removal using the carbon dioxide removing apparatus 1, the exhaust gas and by-product gas generated in the factory F are used, the operation amount of the flow rate change valve 20 is set, and the flow rate of the gas to be processed introduced into the reaction tank 2 is minimized. In the state adjusted so that it may become a speed | rate exceeding a fluidization speed | rate, it introduce | transduces into the inside of the reaction tank 2 which accommodated the carbon dioxide carrier 22 from the to-be-processed gas introduction part 10. FIG. As a result, a fluidized bed is formed by the carbon dioxide carrier 22 inside the reaction tank 2.

At this time, the gas to be treated introduced from the gas to be treated introduction unit 10 into the reaction vessel 2 is uniformly dispersed inside the reaction vessel 2 by the dispersion plate 12.
After the fluidized bed is formed by the carbon dioxide carrier 22 inside the reaction tank 2, the carbon dioxide carrier 22 not adsorbing carbon dioxide is intermittently charged from the carrier charging hole 14 by the carrier charging means 4. To do.

  The carbon dioxide carrier 22 introduced into the reaction tank 2 in which the fluidized bed is formed adsorbs carbon dioxide and increases its specific gravity. Then, the carbon dioxide carrier 22 in a state where the carbon dioxide is sufficiently adsorbed and has a large specific gravity descends in the reaction tank 2 and is discharged from the carrier discharge hole 16 to fill the carrier guide tube 24. The collected liquid 28 is moved (sedimented) and moved to the sedimentation tank 26.

At this time, since the recovery liquid 28 filled in the carrier guiding tube 24 is pressurized to a pressure that does not allow the gas to be processed to enter the carrier guiding tube 24, the carbon dioxide that has sufficiently adsorbed carbon dioxide. Only the carbon carrier 22 moves from the reaction vessel 2 to the sedimentation separation vessel 26 via the carrier guide tube 24.
Here, when the flow rate of the gas to be treated introduced into the reaction tank 2 exceeds the minimum fluidization speed and becomes a larger speed, stirring of a large number of carbon dioxide carriers 22 is promoted in the fluidized bed. Become. For this reason, there is a possibility that the carbon dioxide carrier 22 that does not adsorb carbon dioxide or has a small amount of carbon dioxide adsorbed is mixed into the carbon dioxide carrier 22 that has sufficiently adsorbed carbon dioxide. .

Therefore, when adjusting the operation amount of the flow rate change valve 20, the degree to which the flow rate of the gas to be treated introduced into the reaction tank 2 exceeds the minimum fluidization rate is determined according to the carbon dioxide adsorption amount. A value suitable for causing segregation in the fluidized bed due to the specific gravity difference of the carrier 22 is preferable.
Various treatments (formation of a fluidized bed by the carbon dioxide carrier 22, introduction of the carbon dioxide carrier 22, etc.) performed in the reaction tank 2 are performed at room temperature without heating or cooling the reaction tank 2. Do in state.

The carbon dioxide carrier 22 that has sufficiently adsorbed carbon dioxide to increase the specific gravity and has moved to the sedimentation separation tank 26 is taken out from the collected liquid 28 filtered by the filter, collected, and moved to the carbon dioxide separation means 8. .
The carbon dioxide carrier 22 moved to the carbon dioxide separator 8 is subjected to treatment such as washing and drying after carbon dioxide is separated by the carbon dioxide separator 8, and intermittently supplied to the reaction tank 2 by the carrier feeder 4. The carbon dioxide contained in the gas to be treated is adsorbed again in the reaction tank 2.

The to-be-processed gas from which carbon dioxide is adsorbed by the carbon dioxide carrier 22 and from which the carbon dioxide contained therein has been removed rises in the reaction tank 2 and comes out of the treated gas discharge duct 18 to equipment (such as a chimney) Move to).
Here, when the gas to be treated is exhaust gas, the exhaust gas from which the carbon dioxide contained is removed is released into the atmosphere. Thereby, it becomes possible to contribute to suppression of the global warming phenomenon.

  On the other hand, when the gas to be treated is a by-product gas, the by-product gas from which carbon dioxide contained therein is removed becomes easier to handle as a combustion gas or the like by removing carbon dioxide that is not a fuel. Thereby, the reuse of resources is promoted, and it becomes possible to contribute to cost reduction and suppression of environmental deterioration.

(Effects of the first embodiment)
The effects of this embodiment are listed below.
(1) In the carbon dioxide removal apparatus 1 of the present embodiment, the carrier recovery unit 6 that recovers the carbon dioxide carrier 22 having adsorbed carbon dioxide from the lower part of the reaction tank 2 communicates with the lower part of the reaction tank 2, and A carrier guide tube 24 filled with the recovery liquid 28 is provided.
For this reason, the to-be-processed gas from which carbon dioxide is not removed is moved to the outside of the reaction tank 2 together with the carbon dioxide carrier 22 that has adsorbed carbon dioxide by the recovery liquid 28 filled in the carrier guide tube 24. Can be suppressed.
As a result, since it becomes possible to suppress that the to-be-processed gas from which carbon dioxide has not been removed moves outside the reaction tank 2 when the carbon dioxide removing apparatus 1 is used, The removal rate can be improved.

(2) In the carbon dioxide removing apparatus 1 of the present embodiment, the carrier loading means 4 transfers the carbon dioxide carrier 22 from which carbon dioxide has been separated by the carbon dioxide separation means 8 to the reaction tank 2 in which the fluidized bed is formed. The reactor 2 is intermittently charged and the fluidizing state is always maintained.
For this reason, in the reaction tank 2 in which the fluidized bed is formed by the carbon dioxide carrier 22, the carbon dioxide contained in the gas to be treated can be continuously removed.
As a result, it is possible to improve the removal rate of carbon dioxide with respect to the gas to be treated, and it is possible to continuously remove carbon dioxide from the gas to be treated with respect to large-scale facilities such as ironworks. It becomes.

(3) In the carbon dioxide removal apparatus 1 of the present embodiment, the dispersion plate 12 that disperses the gas to be processed introduced from the lower part in the reaction tank 2 is provided in the lower part in the reaction tank 2.
For this reason, it becomes possible to disperse the to-be-treated gas introduced from the lower part of the reaction tank 2 by the dispersion plate 12 inside the reaction tank 2, and the to-be-treated gas introduced from the vertically lower side of the reaction tank 2 can be dispersed. It becomes possible to move to the inside of the reaction tank 2 with little bias.
As a result, the gas to be treated introduced from below in the vertical direction of the reaction tank 2 can be evenly dispersed inside the reaction tank 2, so that a large number of carbon dioxides intermittently introduced by the carrier introduction means 4 can be obtained. It is possible to efficiently remove carbon dioxide by the carbon carrier 22.

(Application examples)
Hereinafter, application examples of this embodiment will be listed.
(1) In the carbon dioxide removal apparatus 1 of the present embodiment, the dispersion plate 12 is provided in the lower part of the reaction tank 2. However, the present invention is not limited to this, and the dispersion plate 12 is provided in the reaction tank 2. There may be no configuration.
(2) In the carbon dioxide removal apparatus 1 of the present embodiment, the configuration of the dispersion plate 12 is formed by a conical mesh having openings at the center and in the vicinity of the center, as shown in FIG. However, the configuration of the dispersion plate 12 is not limited to this. That is, for example, as shown in FIG. 3, a plurality (two in the figure) of conical meshes having openings at and near the center may be overlapped. Although not particularly shown, for example, a member having an opening for adjusting the flow of the gas to be treated introduced from below in the vertical direction of the reaction tank 2 is interposed between a plurality of conical meshes stacked. May be.

(Example)
Hereinafter, the results of verifying the effects of the carbon dioxide removal method of the present invention example using the carbon dioxide removal methods of the present invention example and the comparative example will be described with reference to FIGS. 1 and 2.
In the carbon dioxide removal method of the present invention, the carbon dioxide carrier 22 is intermittently charged into the reaction tank 2 in which the fluidized bed is formed by the carbon dioxide carrier 22 as in the first embodiment described above. In this method, carbon dioxide is continuously removed from the gas to be treated.

On the other hand, in the carbon dioxide removal method of the comparative example, a gas to be treated containing carbon dioxide is passed through a layer (reactant-packed layer) filled with a material that causes a reaction for immobilizing carbon dioxide. This is a method for removing carbon dioxide from water.
Here, various by-product gases (B gas, C gas, SF gas, LD gas, thermoselect furnace gas, M gas, exhaust gas after combustion, etc.) are used as the gas to be treated.
In addition, the facility for generating the gas to be treated is a large-scale facility such as a factory F such as a steel mill or a combustion furnace used for a thermal power generator, or a pipe for transferring the various by-product gases described above (B gas pipe, C Gas piping, SF gas piping, LD gas piping, thermoselect furnace gas piping, M gas piping, etc.).

  And with respect to the carbon dioxide removal method of the present invention example and the comparative example, as a result of removing the carbon dioxide from the gas to be treated and comparing the processing amount per unit time, the carbon dioxide removal method of the present invention example is compared. It was confirmed that the throughput per unit time was larger than the carbon dioxide removal method in the example.

DESCRIPTION OF SYMBOLS 1 Carbon dioxide removal apparatus 2 Reaction tank 4 Carrier input means 6 Carrier recovery part 8 Carbon dioxide separation means 10 Processed gas introduction part 12 Dispersion plate 14 Carrier input hole 16 Carrier discharge hole 18 Processed gas discharge duct 20 Flow velocity Change valve 22 Carbon dioxide carrier 24 Carrier induction tube 26 Sedimentation separation tank 28 Recovery liquid F Factory P Piping

Claims (2)

A carbon dioxide removal device for removing carbon dioxide from a gas to be treated,
A reaction tank in which a carbon dioxide carrier that adsorbs carbon dioxide is contained and a fluidized bed of the accommodated carbon dioxide carrier is formed by the gas to be treated introduced from below;
A carrier loading means for intermittently charging the carbon dioxide carrier from the upper part of the reaction vessel;
A carrier recovery unit for recovering the carbon dioxide carrier adsorbing the carbon dioxide from the lower part of the reaction tank;
Carbon dioxide separation means for separating the carbon dioxide from the carbon dioxide carrier recovered by the carrier recovery unit,
The carrier loading means intermittently throws the carbon dioxide carrier separated from the carbon dioxide by the carbon dioxide separation means, into the reaction tank in which the fluidized bed is formed,
The carrier recovery unit includes a carrier guide tube that communicates with a lower portion of the reaction tank and is filled with a liquid.
The carrier induction tube collects the carbon dioxide carrier adsorbing the carbon dioxide from one end in the liquid, and discharges the carbon dioxide carrier collected in the liquid from the other end. A carbon dioxide removing apparatus characterized by that.   The carbon dioxide removing apparatus according to claim 1, wherein a dispersion plate that disperses the gas to be treated introduced from the lower part inside the reaction tank is provided in a lower part of the reaction tank.

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