JPS6312324A - Reactor for carbon dioxide removing device by ion-exchange resin - Google Patents

Abstract

PURPOSE:To compress an ion-exchange resin bed with an appropriate pressure by packing the bed between a lower fixed perforated plate and an upper movable perforated plate, and pressing the movable perforated plate furnished to a spring adjusting spindle. CONSTITUTION:CO2-contg. air is introduced from an inlet pipe 11 for the air to be treated, CO2 is absorbed and removed by the ion-exchange resin bed 5, and the purified air is discharged from a purified air outlet pipe 12. In the absorption stage, the ion-exchange resin bed 5 is compressed by the spring device 6 furnished to the spring adjusting spindle 7 with an appropriate pressure through the movable perforated plate 4. In the subsequent regeneration stage, steam is introduced from a regenerating steam inlet 12 to heat the ion-exchange resin bed 5, and CO2 is desorbed. Although the resin bed 5 is expanded by water, the expansion pressure is absorbed by the spring device 6. The top of a barrel part 1 is closed by a convex spherical spacer 2a, and the holdup volume of CO2 is also reduced since the volume of the upper space is small.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a reactor in an apparatus for removing carbon dioxide gas from the ambient atmosphere in a closed space.

FIG. 5 is a schematic diagram of a CO□ removal system using an ion exchange resin used in a reactor as an absorbent.

Air with high CO2 concentration is absorbed by the blower through filter a. The air is then sent to a reactor d using an ion exchange resin as an absorbent, where the ion exchange resin absorbs CO2 and the purified air is discharged. In this case, a plurality of reactors d are prepared, and CO8 absorption and regeneration by the ion exchange resin are performed alternately and continuously.

Now, if the absorption capacity of any one reactor d decreases,
The CO2 absorption in the reactor d has stopped, and it is necessary to regenerate it by heating the regenerating steam or the like. Steam for regeneration is provided by steam generator e.
It is designed to be generated in the reactor d and sent to the reactor d. The present invention provides a reactor d in such a CO2 removal system.
This is related to the improvement of.

(Prior Art and its Problems) Devices using a weakly basic anion exchange resin as a carbon dioxide absorbent are known for absorbing and removing carbon dioxide gas CO2 from the ambient air in a closed space. In this device, a reactor is an important element for effectively bringing the ion exchange resin into contact with carbon dioxide gas and promoting the ion exchange reaction. The ion exchange resin in this reactor is
By applying a suitable amount of heat, the temperature can be changed to dissociate and release the absorbed carbon dioxide, allowing it to be regenerated.

Conventionally, the type of absorption reactor is as shown in Fig. 4(a).

Vertical types, annular types, and horizontal types as shown in (b) and (c) are known.

A reactor in a device for absorbing carbon dioxide gas from the ambient air in a closed space applies an appropriate compressive force to the filled resin layer during absorption, and also applies a moderate compressive force to the resin layer during regeneration, which swells due to the amount of heat supplied by water vapor and moisture. The mechanism that absorbs the expansion pressure is important. However, in order to effectively utilize the ion exchange resin selected for carbon dioxide absorption, conventional reactors require free ion exchange without any particular control over the contraction and swelling of the ion exchange resin. It was left to the movement of the resin. For this reason, it has been difficult to ensure the optimal dense state of the resin layer for the ion exchange reaction. In addition, when direct heating with water vapor is used to regenerate the resin layer, the resin layer swells freely and expands arbitrarily, and after swelling, the inside of the resin layer becomes linear and the CO□ gas is used in the next process. It has the disadvantage that it is difficult to expect a uniform ion exchange reaction during absorption.

(Objective of the Invention) In view of the above-mentioned problems of the prior art, the present invention aims to: (1) be able to adjust the expansion pressure due to swelling of the resin filled in the reactor and the compression pressure for contraction; and (2) reduce heat loss during regeneration. The object of the present invention is to provide a reactor that can efficiently absorb carbon dioxide gas in the same reactor and also effectively perform a regeneration action.

(Solution Means by the Invention) A cylinder whose surface end is closed with a convex spherical spacer facing inward, a fixed perforated plate spaced apart with a space inside one of the spherical spacers, and the other. an ion exchange resin layer filled between a movable porous plate provided with a space inside the spherical spacer so as to be able to slide vertically; and an ion exchange resin layer fixed to the movable porous plate;
and a spring device that is attached to a spring adjustment shaft that is movable up and down on a bearing with a shaft sealing device that is attached to the one spherical spacer so that the spring force can be adjusted by a screw device, and a spring device that is attached to the inner space of the spherical spacer. It is characterized by a communicating air inlet pipe and a purified air outlet pipe.

(Example) This will be explained based on the drawings. 1 is the cylindrical body of reactor A, which is made of an extremely thin material with low thermal conductivity in order to reduce its heat capacity during heating with regeneration steam. The upper and lower parts of the cylinder 1 are respectively closed with inwardly convex spherical spacers 2a and 2b. A porous plate 3 is fixed with a small space 13a placed above the spherical spacer 2b at the bottom, and has a large number of extremely thin holes as shown in FIG. A movable porous plate 4 is fitted into the lower space 13b of the top spherical spacer 2a so as to be vertically slidable. The movable perforated plate 4 also has extremely fine holes as shown in the plan view of FIG. Reference numeral 4a denotes a ring provided on the periphery of the movable perforated plate 4, which allows the movable perforated plate 4 to slide smoothly when vertically sliding inside the cylinder 1. 5 is an ion exchange resin filled between the fixed porous plate 3 and the movable porous plate 4 in the reactor A. As this resin, a weakly basic anion exchange resin commonly called solid amine resin is used.

Reference numeral 6 denotes a spring device provided on the outer upper part of the upper spherical spacer 2a, which can adjust the pressure during swelling and contraction of the ion exchange resin. The spring device 6 is inserted through the spring adjustment shaft 7 and is attached under tension by a spring force adjustment screw 8.

The spring adjustment shaft 7 is fixed 9 on the center of the movable porous plate 4, and is vertically erected by a bearing 10 with a shaft sealing device provided at the center of the spherical spacer 2a.

When the ion exchange resin filled in reactor A is dried (CO
, during the absorption process) and during swelling (during heating with regeneration steam). The expansion rate at this time is about 20% larger than that when dry, and it is necessary to take measures to release the expansion pressure during this swelling. Then, a spring device 6 is selected and installed outside the reactor. Reference numeral 11 denotes a processing air inlet pipe, which also serves as a carbon dioxide gas outlet pipe during regeneration and is provided above the movable perforated plate 4 in the upper part of the cylinder 1. Reference numeral 12 denotes a purified air outlet pipe, which also serves as a regeneration steam inlet pipe during regeneration, and is provided at the bottom of the lower fixed porous plate 3.

In this embodiment, a movable perforated plate was provided on the upper side of the cylinder and the spring device was fixed to the perforated plate, but the same effect could be obtained even if a movable perforated plate was provided on the lower side and the spring device was fixed to this. It is. Further, even if the processing air inlet and purified air outlet are reversed, there is no change in operation.

The above description has been made for use in a carbon dioxide removal device.

Gas separation using chemical agents such as ion exchange resins (e.g. NOx, SOx, Nu,
.

- It can also be applied to reactors used for absorbing and removing chemical components that cause odor in the atmosphere (carbon oxide gas, etc.).

(Function) a) Carbon dioxide absorption process: The treated air containing a large amount of CO2 is passed through the treated air inlet pipe 1.
It is introduced from 1. The treated air absorbs and removes 002 while passing through the ion exchange resin layer 5, and exits from the reactor A through the purified air outlet pipe 12 at the bottom of the reactor. During the CO absorption process, the ion exchange resin layer 5 is maintained under pressure by the spring device 6 with an appropriate pressure via the movable porous plate 4. After a certain amount of time has passed.

A situation in which the absorption capacity of CO□ in the resin layer 5 has decreased is detected, and a regeneration process of the resin layer 5 is started.

b) Resin regeneration step: Steam is supplied from the regeneration steam port 12 and heated from the lower part of the ion exchange resin layer 5. When heating with steam, moisture is also supplied into the resin layer 5 at the same time. While the heat reaches the top of the resin layer 5, the CO2 gas trapped during the absorption process is dissociated from the resin layer 5 and released upward. The resin layer 5 swells with the supplied water and increases in volume, but the expansion pressure is released by the movable porous plate 4 and the spring device 6. Also, during regeneration, almost 100% concentration of CO□ gas will remain in the upper space 13a of reactor A.
The top of the cylinder 1 is closed with an inwardly convex spherical spacer 2a, and since the volume of the upper space is small, the amount of CO heat retained is also reduced. Similarly, since the lower part of the reactor is closed upward with a convex spherical spacer 2b, the amount of stagnant regeneration steam supplied from the steam port 12 is also minimized.

(Effects of the Invention) The ion exchange resin layer is filled between the lower fixed porous plate and the upper movable porous plate, and the movable porous plate has a predetermined coefficient attached to the spring adjustment shaft 7 passing through the spherical spacer at the top. Since the resin layer is pressed by a spring device, the resin layer is appropriately pressurized, and it is possible to prevent the air to be treated from flowing in one direction in the resin layer. In addition, since the pressure when the ion exchange resin swells and contracts can be adjusted by moving the screw device 8 up and down, it is possible to apply pressure at a pressure suitable for CO2 absorption performance and regeneration performance. is placed outside reactor A, so the amount of heat required to heat it can be saved.

Since the top of the cylinder is closed with a spherical spacer, the space above the ion exchange resin layer can be made small, and during CO2 regeneration, the amount of CO2 retained in the N can be minimized.

Since the top and bottom of the cylinder are closed with spherical spacers, when the processing air is introduced from the inlet pipe 11, a vortex is generated on the spherical surface, dispersed appropriately, and sent into the resin layer.

The reaction is carried out effectively. Also, when the regeneration steam is sent from the inlet pipe 12, a vortex is generated by the single spherical spacer, and this is also appropriately dispersed and evenly sent to the resin layer, allowing the regeneration process to be carried out effectively.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a reactor according to the present invention. FIG. 2 is a top view of FIG. 1, showing only half of it. FIG. 3 is a plan view of the movable perforated plate, showing only half of it. FIG. 4 shows an example of a conventional absorption reactor. Figure 5 is a schematic diagram of a CO□ removal system using ion exchange resin as an absorbent. In the figure: A reactor 1 cylinder 2a, 2b spherical spacer 3 fixed perforated plate 4 movable perforated plate 4a sliding ring 5 ion exchange resin layer 6 spring device
7 Spring adjustment shaft 8 Spring force adjustment screw 9 Fixed part 10 Bearing with shaft sealing device 11 Processed air inlet pipe 12
Purified air outlet pipes 13a, 13b Above space Applicant Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Isamu Ohashi Figure 1

Claims (1)

[Claims] A cylinder whose both ends are closed with inwardly convex spherical spacers, a fixed perforated plate spaced apart with a space inside one spherical spacer, and a space inside the other spherical spacer. and a movable perforated plate provided so as to be able to slide up and down, and an ion exchange resin layer filled between the ion exchange resin layer and the movable perforated plate, and fixed to the movable perforated plate,
and a spring device that is attached to a spring adjustment shaft that is movable up and down on a bearing with a shaft sealing device that is attached to the one spherical spacer so that the spring force can be adjusted by a screw device, and a spring device that is attached to the inner space of the spherical spacer. A reactor for a carbon dioxide removal device using an ion exchange resin, comprising a treated air inlet pipe and a purified air outlet pipe that communicate with each other.