JP2021115502A - Absorbent regeneration method - Google Patents

Abstract

To provide an absorbent regeneration method capable of easily regenerating a used absorbent adsorbed with nitrogen oxide.SOLUTION: The adsorbent regeneration method includes an adsorbent feeding step, a step of separating and migrating into hot air, a process of separating into hot air and adsorbent, and a recovery process. In the adsorbent feeding step, the adsorbent adsorbed with nitrogen oxide is supplied to the regeneration chamber 2. In the process of separating and migrating into the hot air, the hot air at a temperature higher than room temperature is supplied to the regeneration chamber 2 under the reduced pressure state lower than the atmospheric pressure, and the adsorbent supplied to the regeneration chamber 2 is exposed to the hot air in the reduced pressure state, and the adsorbed nitrogen oxide is separated and migrated into hot air. In the separated process, hot air higher than room temperature containing nitrogen oxide and adsorbent is separated into hot air and adsorbent by a bug filter. In the recovery process, the nitrogen oxide recovers the adsorbent separated.SELECTED DRAWING: Figure 2

Description

The present invention relates to an adsorbent regeneration method.

The method for regenerating the denitration adsorbent described in Patent Document 1 regenerates the denitration adsorbent. The denitration adsorbent is used in a nitrogen oxide denitration treatment apparatus. In the method for regenerating the denitration adsorbent described in Patent Document 1, the denitration adsorbent adsorbing nitrogen oxides is washed with water to desorb the adsorbed nitrogen oxides. Subsequently, the denitration adsorbent is regenerated by drying the denitration adsorbent.

Japanese Unexamined Patent Publication No. 2003-159511

However, in the method for regenerating the denitration adsorbent described in Patent Document 1, since the denitration adsorbent needs to be washed with water and then dried, the used adsorbent on which nitrogen oxides are adsorbed can be easily regenerated. Can not do it.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an adsorbent regeneration method capable of easily regenerating a used adsorbent on which nitrogen oxides are adsorbed.

The adsorbent regeneration method according to the present invention includes an adsorbent supply step, a step of separating and shifting to hot air, a step of separating the hot air and the adsorbent, and a recovery step. In the adsorbent supply step, the adsorbent on which nitrogen oxides are adsorbed is supplied to the regeneration chamber. In the step of separating and shifting to hot air, hot air having a temperature higher than room temperature is supplied to the regeneration chamber under a reduced pressure state lower than atmospheric pressure, and the adsorbent supplied to the regeneration chamber is exposed to the hot air under reduced pressure. , The adsorbed nitrogen oxide is separated and transferred to hot air. In the separation step, the hot air containing the nitrogen oxide and the adsorbent at a temperature higher than room temperature is separated into the hot air and the adsorbent by a bag filter. In the recovery step, the adsorbent from which the nitrogen oxides have been separated is recovered.

In one embodiment, the pressure under the reduced pressure state is an absolute pressure of 12 ± 3 kPa.

In certain embodiments, the temperature of the hot air is 200 ± 30 ° C.

In certain embodiments, the adsorbent comprises a zeolite.

In certain embodiments, the adsorbent comprises a first adsorbent and a second adsorbent. The nitrogen oxide is adsorbed on the first adsorbent. A substance different from the nitrogen oxide is adsorbed on the second adsorbent. In the step of separating and transferring to the hot air, the nitrogen oxide adsorbed on the first adsorbent and a substance different from the nitrogen oxide adsorbed on the second adsorbent are separated and transferred to the hot air. In the recovery step, the first adsorbent from which the nitrogen oxide has been separated and the second adsorbent from which a substance different from the nitrogen oxide has been separated are recovered.

According to the adsorbent regeneration method according to the present invention, a used adsorbent on which nitrogen oxides are adsorbed can be regenerated.

It is a block diagram of the adsorbent regeneration system which concerns on embodiment of this invention. It is a figure of the adsorbent regeneration apparatus and post-treatment apparatus which concerns on embodiment of this invention. It is a flowchart which shows the adsorbent regeneration method which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and the description is not repeated.

The adsorbent regeneration system 100 according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of an adsorbent regeneration system 100 according to an embodiment of the present invention.

As shown in FIG. 1, the adsorbent regeneration system 100 includes an adsorbent regeneration device 10 and a post-treatment device 20. The adsorbent regeneration system 100 regenerates the used adsorbent used by the processing apparatus 200.

The treatment device 200 treats, for example, the exhaust gas discharged from the marine engine. The processing device 200 is, for example, a denitration device. Specifically, the processing apparatus 200 reduces, for example, nitrogen oxides (NOx) contained in the exhaust gas. The treatment device 200 reduces nitrogen oxides contained in the exhaust gas by using an adsorbent. The adsorbent is a powder. The adsorbent includes, for example, zeolite. The adsorbent adsorbs nitrogen oxides.

The adsorbent regenerating device 10 regenerates the used adsorbent used in the processing device 200. Specifically, the adsorbent regenerating device 10 regenerates the adsorbent on which nitrogen oxides are adsorbed. More specifically, the adsorbent regenerating device 10 regenerates the adsorbent by separating the nitrogen oxide from the adsorbent to which the nitrogen oxide is adsorbed. The separated nitrogen oxides are supplied to the aftertreatment device 20. Details of the adsorbent regenerating device 10 will be described later with reference to FIG.

The aftertreatment device 20 treats the nitrogen oxides discharged from the adsorbent regeneration device 10.

The adsorbent regenerating device 10 will be further described with reference to FIGS. 1 and 2. FIG. 2 is a diagram of the adsorbent regenerating device 10 and the aftertreatment device 20 according to the embodiment of the present invention.

As shown in FIG. 2, the adsorbent regeneration device 10 includes a supply unit 1, a regeneration chamber 2, a hot air supply duct 3, a recovery mechanism 4, an auxiliary chamber 5, a cooling tower 6, and a decompression pump device 7. , Pipes P1 to P8.

As shown in FIG. 2, the used adsorbent used in the processing apparatus 200 (FIG. 1) is supplied to the supply unit 1. Hereinafter, in the present specification, the used adsorbent used in the processing apparatus 20 may be referred to as a used adsorbent. Nitrogen oxides are adsorbed on the used adsorbent. The supply unit 1 is connected to the regeneration chamber 2 via the pipe P1. The supply unit 1 supplies the used adsorbent to the regeneration chamber 2 via the pipe P1. The supply unit 1 supplies the used adsorbent to the regeneration chamber 2 by an air transport method.

The regeneration chamber 2 has a plurality of bag filters 2A, an offline pulse jet device 2B, and an inclined plate 2C.

An adsorbent in which the nitride oxide is separated from the used adsorbent adheres to the bag filter 2A. In the present specification, an adsorbent in which a nitride oxide is separated from a used adsorbent may be referred to as a regenerated adsorbent. The bag filter 2A is, for example, a filter cloth. The bag filter 2A is formed by, for example, Teflon (registered trademark).

The offline pulse jet device 2B injects compressed air in a pulse shape toward the bag filter 2A to remove the regenerated adsorbent adhering to the surface of the bag filter 2A. The offline pulse jet device 2B is 6 kg / cm2 (centimeter square meter) and is injected for 0.1 seconds. The regeneration chamber 2 is divided into a plurality of compartments. When the regenerated adsorbent is wiped off, the offline pulse jet device 2B injects air in a pulse shape in a compartment where the line is cut off.

The inclined plate 2C is provided at the bottom of the regeneration chamber 2. The inclined plate 2C is formed with a hole for passing hot air supplied from the hot air supply duct 3. The regenerated adsorbent brushed off by the offline pulse jet device 2B is guided by the inclined plate 2C and supplied to the recovery mechanism 4.

The hot air supply duct 3 is connected to the bottom of the regeneration chamber 2. When the used adsorbent is regenerated, hot air is supplied from the hot air supply duct 3 to the regenerating chamber 2. The temperature of the hot air supplied from the hot air supply duct 3 is higher than room temperature. The temperature of the hot air supplied from the hot air supply duct 3 is preferably 200 ± 30 ° C. In this embodiment, the temperature of the hot air is 200 ° C. By supplying hot air to the regeneration chamber 2, the temperature inside the regeneration chamber 2 is maintained at about 200 ° C.

The regeneration chamber 2 is maintained in a depressurized state lower than the atmospheric pressure by the decompression pump device 7. The pressure under the reduced pressure state is preferably an absolute pressure of 12 ± 3 kPa.

In the regeneration chamber 2, the used adsorbent supplied to the regeneration chamber 2 is regenerated. When the used adsorbent is regenerated, hot air having a temperature higher than room temperature is supplied to the regenerating chamber 2 under a reduced pressure state lower than atmospheric pressure. Then, the adsorbent supplied to the regeneration chamber 2 is exposed to hot air in a reduced pressure state. As a result, the nitrogen oxides adsorbed on the used adsorbent are separated and transferred to the hot air.

Next, the hot air containing the nitrogen oxide and the adsorbent at a temperature higher than room temperature is separated into the hot air and the adsorbent by the bag filter 2A. Specifically, the adsorbent adheres to the bag filter 2A.

The recovery mechanism 4 recovers the regenerated adsorbent. That is, the recovery mechanism 4 recovers the adsorbent from which the nitrogen oxides have been separated.

The auxiliary chamber 5 is connected to the regeneration chamber 2 via the pipe P2. In the regeneration chamber 2, 99% of the used adsorbent is recovered. The auxiliary chamber 5 regenerates the used adsorbent that has moved to the auxiliary chamber 5 without being collected in the regeneration chamber 2. Further, even if the regeneration chamber 2 is damaged, the used adsorbent can be regenerated by the auxiliary chamber 5. The auxiliary chamber 5 has a secondary bag filter 5A and an online pulse jet device 5B.

The regenerated adsorbent adheres to the secondary bag filter 5A. The bag filter 2A is, for example, a filter cloth. The secondary bag filter 5A is formed by, for example, Teflon (registered trademark).

The online pulse jet device 5B injects compressed air in a pulse shape toward the secondary bag filter 5A to remove the regenerated adsorbent adhering to the surface of the secondary bag filter 5A. The online pulse jet device 5B injects air in a pulse shape without interrupting the line. The regenerated adsorbent that has been wiped off can be taken out of the auxiliary chamber 5 from an on-off valve provided at the bottom of the auxiliary chamber 5.

The cooling tower 6 is connected to the auxiliary chamber 5 via the pipe P3. The cooling tower 6 cools the hot air (about 180 ° C.) emitted from the auxiliary chamber 5. The cooling tower 6 is connected to the pipe P4 and the pipe P5. Water is injected from the pipe P4. The water injected from the pipe P4 circulates in the cooling tower 6 and is discharged from the pipe P5. Therefore, the hot air in the cooling tower 6 is cooled by the water circulating in the cooling tower 6. That is, the hot air (about 180 ° C.) in the cooling tower 6 changes to warm air (about 40 ° C.).

The decompression pump device 7 is connected to the cooling tower 6 via the pipe P6. The decompression pump device 7 sucks warm air (about 40 ° C.) from the cooling tower 6. The decompression pump device 7 is configured here in a gear system. The decompression pump device 7 may be of the roots type. The temperature of the air sucked into the decompression pump device 7 must be suppressed to about 180 ° C. to 40 ° C. by the cooling tower 6 so that the functional maintenance of the decompression pump device 7 is not affected by thermal expansion. ..

The aftertreatment device 20 is connected to the decompression pump device 7 via the pipe P7. The warm air (about 40 ° C.) emitted from the decompression pump device 7 flows into the aftertreatment device 20. The aftertreatment device 20 processes the warm air emitted from the decompression pump device 7 so that it can be discharged to the outside of the aftertreatment device 20. The aftertreatment device 20 is connected to the regeneration chamber 2 via the pipe P8. When hot air (for example, about 200 ° C.) is generated in the aftertreatment device 20, it is preferable to supply the hot air to the regeneration chamber 2.

Next, the adsorbent regeneration method according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 3 is a flowchart showing an adsorbent regeneration method according to an embodiment of the present invention. By executing the processes of steps S102 to S108 shown in FIG. 3, the adsorbent is regenerated.

Step S102: In the adsorbent supply step, the adsorbent on which the nitrogen oxide is adsorbed is supplied to the regeneration chamber 2. The process proceeds to step S104.

Step S104: In the step of separating and shifting to hot air, hot air having a temperature higher than room temperature is supplied to the regeneration chamber 2 under a reduced pressure state lower than atmospheric pressure. Then, the adsorbent supplied to the regeneration chamber 2 is exposed to hot air in a reduced pressure state. As a result, the adsorbed nitrogen oxides are separated and transferred to hot air. The process proceeds to step S106.

Step S106: In the step of separating the hot air and the adsorbent, the hot air containing the nitrogen oxide and the adsorbent at a temperature higher than room temperature is separated into the hot air and the adsorbent by the bag filter 2A. The process proceeds to step S108.

Step S108: In the recovery step, the adsorbent from which the nitrogen oxides have been separated is recovered. The process ends.

As described above with reference to FIGS. 1 to 3, according to the adsorbent regeneration method of the present embodiment, the nitrogen oxide adsorbed on the used adsorbent is separated and transferred to hot air. Then, the hot air having a temperature higher than room temperature containing the nitrogen oxide and the adsorbent is separated into the hot air and the adsorbent by the bag filter 2A. Then, the adsorbent from which the nitrogen oxides have been separated is recovered. Therefore, the used adsorbent on which nitrogen oxides are adsorbed can be easily regenerated.

The adsorbent regenerating device 10 may regenerate an adsorbent in which two or more types of adsorbents are mixed. For example, the adsorbent may contain a first adsorbent and a second adsorbent. Nitrogen oxides are adsorbed on the first adsorbent. The first adsorbent includes, for example, zeolite. A substance different from nitrogen oxides is adsorbed on the second adsorbent. The second adsorbent contains, for example, activated carbon. The size of activated carbon is, for example, 60 ± 50 microns. For example, sulfur dioxide gas (SOx) is adsorbed on the second adsorbent. Ammonia gas (NH3) may be adsorbed on the second adsorbent, for example. Further, for example, carbon dioxide (CO2) may be adsorbed on the second adsorbent. When carbon dioxide is adsorbed on the second adsorbent, the second adsorbent includes, for example, zeolites, activated carbon, alumina, metal-organic frameworks, silica or molecular sieves.

In the step of separating and transferring to hot air, the nitrogen oxide adsorbed on the first adsorbent and a substance different from the nitrogen oxide adsorbed on the second adsorbent are separated and transferred to hot air.

In the recovery step, the first adsorbent from which the nitrogen oxides have been separated and the second adsorbent from which a substance different from the nitrogen oxides has been separated are recovered.

As described above, according to the adsorbent regeneration method of the present embodiment, the adsorbent in which two or more kinds of adsorbents are mixed can be regenerated at one time.

The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 3). However, the present invention is not limited to the above-described embodiment, and can be implemented in various embodiments without departing from the gist thereof. The drawings are schematically shown mainly for each component for easy understanding, and the thickness, length, number, etc. of each component shown are different from the actual ones for the convenience of drawing creation. .. Further, the material, shape, dimensions, etc. of each component shown in the above embodiment are merely examples, and are not particularly limited, and various changes can be made without substantially deviating from the effects of the present invention. be.

2 Regeneration chamber 2A Bag filter

Claims (5)

The adsorbent supply process that supplies the adsorbent on which nitrogen oxides are adsorbed to the regeneration chamber, and
Hot air at a temperature higher than room temperature is supplied to the regeneration chamber under a reduced pressure state lower than atmospheric pressure, and the adsorbent supplied to the regeneration chamber is exposed to the hot air under reduced pressure to adsorb the nitrogen oxidation. The process of separating and transferring things to hot air,
A step of separating the hot air containing the nitrogen oxide and the adsorbent at a temperature higher than room temperature into the hot air and the adsorbent by a bag filter.
A method for regenerating an adsorbent, which comprises a recovery step of recovering the adsorbent from which the nitrogen oxides have been separated. The adsorbent regeneration method according to claim 1, wherein the pressure under the reduced pressure state is an absolute pressure of 12 ± 3 kPa. The adsorbent regeneration method according to claim 1 or 2, wherein the temperature of the hot air is 200 ± 30 ° C. The adsorbent regeneration method according to any one of claims 1 to 3, wherein the adsorbent contains zeolite. The adsorbent is
The first adsorbent on which the nitrogen oxide was adsorbed and
It contains a second adsorbent to which a substance different from the nitrogen oxide is adsorbed.
In the step of separating and transferring to the hot air, the nitrogen oxide adsorbed on the first adsorbent and a substance different from the nitrogen oxide adsorbed on the second adsorbent are separated and transferred to the hot air.
Any of claims 1 to 4, wherein in the recovery step, the first adsorbent from which the nitrogen oxide has been separated and the second adsorbent from which a substance different from the nitrogen oxide has been separated are recovered. The adsorbent regeneration method according to item 1.

Images