JPH0316165B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention uses an ion exchange resin in a device that absorbs and removes carbon dioxide gas (CO ₂ ) from the ambient air in a closed space using an absorbent such as a weakly basic ion exchange resin. The present invention relates to a method for recovering regenerated heat. The process of absorbing carbon dioxide gas is carried out by sending the treated air to a reactor containing an absorbent and bringing it into contact with the absorbent, and the regeneration process involves changing the temperature of the absorbent by heating it with steam or the like to dissociate carbon dioxide gas. Such absorption and regeneration steps are alternately circulated, and the heat retained in the reactor immediately after the regeneration step is recovered,
It is about how to reuse. (Prior art) As shown in Figure 2, a carbon dioxide removal device equipped with reactors 1 and 2 is operated by sequentially circulating the reactors 1 and 2 so that when one is in the absorption process, the other is in the regeneration process. was. With this method, immediately after the carbon dioxide absorbent is regenerated, the steam remaining inside the reactor, the carbon dioxide absorbent, and the amount of heat held by the reactor are transported by the treatment air and transported into the closed space at the start of the absorption process. The heat was either radiated to the outside of the system as waste heat through a cooler, or was released outside the system as waste heat through a cooler. For this reason, it has a drawback in that it does not make efficient use of thermal energy. (Problems to be Solved by the Invention) An object of the present invention is to recover the residual heat received from the steam used in the regeneration process in the reactor and reuse it, thereby making effective use of thermal energy. (Solution according to the invention) The reactor is composed of a plurality of reactors each having a treated air inlet valve and a carbon dioxide gas outlet valve on one side, and a purified air outlet valve and a regeneration steam inlet valve on the other side, so that absorption and regeneration are performed sequentially. In the carbon dioxide removal method described above, the purified air outlet valve of one reactor and the treated air inlet pipe of the next reactor are connected by a bypass pipe via a bypass valve, and the The reactor was connected to the reactor through a bypass pipe so that residual heat in the reactor immediately after regeneration was flowed to the regenerator immediately before regeneration for preheating. (Example) An explanation will be given based on FIG. 1. 1 and 2 are reactors, each of which is filled with an ion exchange resin 12. 3 and 5 are treated air inlet valves, and 4 and 6 are purified air outlet valves. 7 and 9 are carbon dioxide gas outlet valves, through which carbon dioxide gas generated from inside the resin layer 12 during regeneration is discharged. 8 and 10 are regeneration steam inlet valves. Reference numeral 11 denotes a bypass valve provided in a bypass line 11a connecting the purified air outlet pipe 4a on the reactor 1 side and the treated air inlet pipe 5a on the reactor 2 side. Although the figure shows two reactors 1 and 2, it is of course possible to use more reactors. For example, Figure 3 shows a case where there are three reactors 1, 2, and 3, and the purified air outlet pipe of reactor 2 and the treated air inlet pipe of reactor 3 are connected by a bypass pipe via a bypass valve. There is. Furthermore, the purified air outlet pipe of reactor 3 and the reactor 1
The treated air inlet pipe of the reactor 1 is connected to the reactor 1 by a bypass pipe through a bypass valve 11.
It is now possible to perform these steps sequentially. (Function) In FIG. 1, reactor 1 is in a state immediately after regeneration, and reactor 2 is in a state immediately before regeneration. Now, the bypass valve 11, the treated air inlet valve 3, and the purified air inlet valve 6 are opened, and the purified air outlet valve 4, the treated air inlet valve 5, the carbon dioxide gas outlet valves 7, 9, and the regeneration steam inlet valves 8, 10 are opened. Set it as "closed". Therefore, processing air is sent from the inlet valve 3 into the reactor 1 which is in a high temperature state immediately after regeneration, and the bypass valve 1
1, air is supplied in series at fixed time intervals to the reactor 2 which is in a state immediately before regeneration. Then, with the amount of heat held by reactor 1 in the state immediately after regeneration,
The reactor 2 in the state immediately after regeneration is preheated. After a certain period of time has elapsed, by operating the valves as described below, reactor 1 moves to the absorption process and reactor 2 moves to the regeneration process. Valve "open": Processed air inlet valve 3, purified air outlet valve 4, carbon dioxide gas outlet valve 9, steam inlet valve for regeneration 10 Valve "closed": Bypass valve 11, processed air inlet valve 5,
Purified air outlet valve 6, carbon dioxide gas outlet valve 7, regeneration steam inlet valve 8 Although not shown in FIG. A bypass pipe line connecting the process air inlet pipe is provided, and a bypass valve is provided in the bypass pipe line, and by operating the bypass valve, it is also possible to perform the operation opposite to the above. (Effect) The purified air outlet valve of the reactor immediately after heating regeneration and the treated air inlet valve of the other reactor immediately before regeneration can be communicated via the bypass pipe via the bypass valve, so that the The heat remaining in the reactor can be used to preheat the reactor immediately before regeneration, making it possible to recover and reuse the heat, making it possible to further reduce the energy required for regeneration than before.

[Brief explanation of the drawing]

FIG. 1 shows an apparatus implementing the regenerative heat recovery method according to the present invention. Figure 2 shows a conventional carbon dioxide removal device. Third
The figure shows an example in which there are three reactors. In the figure; 1, 2...reactor, 3, 5...processed air inlet valve, 4, 6...purified air outlet valve, 7,
9... Carbon dioxide gas outlet valve, 8, 10... Steam inlet valve for regeneration, 11... Bypass valve, 12... Ion exchange resin.

Claims (1)

[Claims] 1 Install the processing air inlet valve and carbon dioxide outlet valve on one side.
In a carbon dioxide removal method consisting of a plurality of reactors each having a purified air outlet valve and a steam inlet valve for regeneration on opposite sides, in which absorption and regeneration are performed sequentially, the purified air outlet valve of one reactor and the next The treated air inlet pipe of the stage reactor is connected with a bypass pipe via a bypass valve, and the reactor immediately after regeneration and the reactor immediately before regeneration are connected with a bypass pipe to remove the residual air in the reactor immediately after regeneration. A method for recovering regeneration heat in a carbon dioxide removal device using an ion exchange resin, characterized in that heat is flowed into a regenerator immediately before regeneration for preheating.