JP6965169B2 - Gas purification equipment and gas purification method - Google Patents

Description

The present invention relates to a gas purification apparatus and a gas purification method.

In the production of industrial gas, a temperature fluctuation adsorption (TSA: Thermal Swing Attachment) type gas purification device, that is, a TSA device is known as a device for purifying a gas containing an object to be removed to obtain a product gas (refined gas). There is.
In a general TSA device, when the adsorbent in the adsorption tower is regenerated after the gas is purified, a part of the product gas is heated and supplied to the adsorption tower as a regenerated gas, and the adsorbent in the adsorption tower is regenerated. Detach the object to be removed from the adsorbent. Regarding the product gas that is used to regenerate the adsorbent in the adsorption tower and is discharged from the adsorption tower, that is, the recycled exhaust gas, reuse as a raw material, recovery of useful components, recovery of thermal energy, and the like are examined.
However, when the temperature of the recycled exhaust gas is low, the recovery of thermal energy has less cost advantage. On the other hand, in order to raise the temperature of the regenerated exhaust gas, it is industrially disadvantageous to heat the regenerated gas above the temperature required for regenerating the adsorbent in the adsorption tower.

The techniques described in Patent Documents 1 and 2 are known as techniques for recovering the thermal energy of exhaust gas emitted from factories, power plants, and the like. In the apparatus described in Patent Document 1, the exhaust gas containing water vapor is brought into contact with the adsorbent to release the moisture in the adsorbent, the exhaust gas is cooled by the refrigerant, the water vapor in the exhaust gas is condensed and removed, and the latent heat is taken out, and the residual exhaust gas remains. A device is provided in which water is adsorbed by an adsorbent and the refrigerant used for recovering the latent heat is used as a heat source for another device.
In the method described in Patent Document 2, hot water is used as a means for cooling the cooling water discharged from the adsorbent heat exchanger of the adsorption type refrigerator by using a geothermal heat exchanger that exchanges heat with the geothermal heat. The heat energy of the exhaust gas recovered as is used as the heat source water of the adsorption type refrigerator.

Japanese Unexamined Patent Publication No. 8-10550 JP-A-2010-249434

However, in the apparatus described in Patent Document 1, the configuration of the pipe through which the exhaust gas flows is complicated, and the operation of the flow path switching valve is complicated. Since the configuration of the piping is complicated, the recovered thermal energy is likely to be lost, and the thermal energy may not be used effectively.
Since the method described in Patent Document 2 requires a geothermal heat exchanger, there is a possibility that the piping becomes complicated and the device becomes large as in the device described in Patent Document 1.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas purification apparatus and a gas purification method that can effectively utilize the thermal energy of recycled exhaust gas by a simple configuration and operation.

In order to solve the above problems, the present invention has the following configurations.
[1] A gas purification apparatus including a regenerated exhaust gas line in which a gas containing an object to be removed is purified by a temperature fluctuation adsorption method and a regenerated exhaust gas discharged from an adsorption tower to which the regenerated gas is supplied flows. A gas purification device provided on the line and provided with an adsorbent having an adsorbent that adsorbs an object to be removed, and a heat exchanger that exchanges heat between the gas derived from the adsorber and the regenerated gas. ..
[2] The gas purification apparatus according to [1], further comprising a regenerated gas line for supplying the regenerated gas to the adsorption tower, and the heat exchanger is provided between the regenerated gas line and the regenerated exhaust gas line.
[3] The gas purification apparatus according to [1] or [2], wherein a cooler for cooling the recycled exhaust gas is provided in the recycled exhaust gas line.
[4] This is a temperature fluctuation adsorption type gas purification method using the gas purification apparatus according to any one of [1] to [3], and when the adsorbent in the adsorption tower is regenerated, the regeneration including the object to be removed is included. The exhaust gas is introduced into the adsorber, the object to be removed is adsorbed by the adsorbent in the adsorber, and heat is exchanged between the gas derived from the adsorber and the regenerated gas to heat the regenerated gas. Recycled gas is introduced into the adsorbent having the heating step for adsorbing the object to be removed and the adsorbent adsorbing the object to be removed in the heating step to desorb the object to be removed from the adsorbent in the adsorber. A gas purification method comprising a cooling step of exchanging heat between a gas derived from an adsorber and the regenerated gas to cool the regenerated gas.

According to the present invention, the thermal energy of the recycled exhaust gas can be effectively used by a simple configuration and operation.

It is a schematic diagram which shows an example of the structure of the gas purification apparatus which concerns on one Embodiment to which this invention is applied.

The meanings of the following terms in the present specification are as follows.
"Regeneration" of the adsorbent means returning the adsorbent to which the object to be removed has been adsorbed to a state in which the object to be removed can be adsorbed again.
The “regenerated gas” means a gas supplied for regenerating an adsorbent to an adsorbent tower having an adsorbent to be regenerated.
The "recycled exhaust gas" is a gas discharged from an adsorption tower having an adsorbent to be regenerated, and means a gas used for regenerating the adsorbent.

Hereinafter, a gas purification apparatus and a gas purification method according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. In addition, in the drawings used in the following description, in order to make the features easy to understand, the featured parts may be enlarged for convenience, and the dimensional ratios of each component may not be the same as the actual ones. No.

<Gas purification device>
First, the configuration of the gas purification apparatus 1 according to the embodiment to which the present invention is applied will be described.
FIG. 1 is a schematic view showing an example of the configuration of the gas purification apparatus 1. The gas purification device 1 is a temperature fluctuation adsorption (hereinafter referred to as “TSA”) type device for removing the removal target from the raw material gas containing the removal target to obtain the purification gas.
As shown in FIG. 1, the gas purification device 1 includes a compressor 2, adsorption towers 3a and 3b, a heater 4, an adsorber 5, a heat exchanger 6, a supply line L1, a decompression line L2, a recycled exhaust gas line L3, and recovery. A line L4, a filling line L5, a regenerated gas line L6, and a heating line L7 are provided.
Each component of the gas purification apparatus 1 will be described in detail below.

The compressor 2 is not particularly limited as long as it can compress the raw material gas. The compressor 2 supplies the compressed raw material gas to the adsorption towers 3a and 3b via the supply line L1.

The combination of the raw material gas, that is, the refined gas and the object to be removed is not particularly limited. For example, air containing at least one selected from the group consisting of water, nitrogen, nitrous oxide and carbon dioxide as an object to be removed; at least one selected from the group consisting of carbon dioxide, water, nitrogen and air as an object to be removed. Methane gas; hydrogen containing at least one selected from the group consisting of water, carbon dioxide, nitrogen and air as a removal target.

The suction towers 3a and 3b have basically the same configuration and have a hollow cylindrical shape, and lower side pipes 7a and 7b and upper side pipes 8a and 8b are connected to both upper and lower ends thereof. The adsorption towers 3a and 3b have an adsorbent inside. The adsorbent is not particularly limited as long as the object to be removed can repeat adsorption and desorption depending on the concentration of the object to be removed in the atmosphere in the adsorption towers 3a and 3b and the temperature of the atmosphere. As a result, the adsorption towers 3a and 3b can purify the gas containing the object to be removed by adsorbing the object to be removed by the adsorbent.

The adsorbent is appropriately selected based on the combination with the object to be removed contained in the raw material gas. For example, when removing moisture in the air, activated alumina is selected as the adsorbent. For example, when removing carbon dioxide in methane gas, NaX zeolite is selected as the adsorbent. For example, when removing nitrogen in hydrogen, LiX zeolite is selected as the adsorbent.

The supply line L1 is a line for supplying the raw material gas containing the object to be removed to the adsorption towers 3a and 3b. The first end of the supply line L1 is connected to the compressor 2, and the second end is branched into a first supply branch line La1 and a second supply branch line Lb1.
The first supply branch line La1 is connected to the lower side pipe 7a. A valve Va1 is provided in the first supply branch line La1. The second supply branch line Lb1 is connected to the lower side pipe 7b. A valve Vb1 is provided on the second supply branch line Lb1.

The recovery line L4 is a line for recovering the purified gas from the adsorption towers 3a and 3b. The recovery line L4 has a first end branched into a first recovery branch line La4 and a second recovery branch line Lb4, and the second end is connected to a storage container (not shown). The first recovery branch line La4 is connected to the upper side pipe 8a. A valve Va4 is provided on the first recovery branch line La4. The second recovery branch line Lb4 is connected to the upper side pipe 8b. A valve Vb4 is provided on the second recovery branch line Lb4.

The decompression line L2 is a line for reducing the pressure in the suction tower to perform a process called decompression. In the decompression step, after the object to be removed is adsorbed by the adsorbent in the adsorption tower, the object to be removed is desorbed from the surface of the adsorbent by lowering the pressure in the adsorption tower.
The first end of the decompression line L2 is branched into a first decompression branch line La2 and a second decompression branch line Lb2, and the second end is an open end. The first decompression branch line La2 is connected to the lower side pipe 7a. A valve Va2 is provided on the first decompression branch line La2. The second decompression branch line Lb2 is connected to the lower side pipe 7b. A valve Vb2 is provided on the second decompression branch line Lb2.

The regenerated gas line L6 is a line for supplying a part of the purified gas as regenerated gas to the adsorption tower to be regenerated. The regenerated gas line L6 has a first end branched into a first regenerated gas branch line La6 and a second regenerated gas branch line Lb6 at a branch point r, and a second end is a recovery line L4. It is connected. The first regenerated gas branch line La6 is connected to the upper side pipe 8a. A valve Va6 is provided in the first regenerated gas branch line La6. The second regenerated gas branch line Lb6 is connected to the upper side pipe 8b. A valve Vb6 is provided on the second regenerated gas branch line Lb6.
The regenerated gas line L6 is provided with a heat exchanger 6 and a valve V7 in this order from the primary side (upstream side of the regenerated gas). The heat exchanger 6 will be described later.

The heating line L7 is a line for heating the regenerated gas. The first end of the heating line L7 is connected to the regenerated gas line L6 at the connection point p, and the second end is connected to the regenerated gas line L6 at the connection point q. Here, the connection point p is located between the heat exchanger 6 and the valve V7, the connection point q is located between the valve V7 and the branch point r, and the connection point p is the primary side of the connection point q (regenerated gas). On the upstream side of). The heating line L7 is provided with a heater 4 and a valve V8 in this order from the primary side.
The heater 4 is not particularly limited as long as it can heat the regenerated gas flowing through the heating line L7.

The recycled exhaust gas line L3 is a line for discharging the recycled exhaust gas. The regenerated exhaust gas line L3 has a first end branched into a first regenerated exhaust gas branch line La3 and a second regenerated exhaust gas branch line Lb3, and the second end is an open end. The regenerated exhaust gas line L3 is provided with an adsorber 5 and a heat exchanger 6 in this order from the primary side (upstream side of the regenerated exhaust gas).
The first recycled exhaust gas branch line La3 is connected to the lower side pipe 7a. A valve Va3 is provided in the first recycled exhaust gas branch line La3. The second recycled exhaust gas branch line Lb3 is connected to the lower side pipe 7b. A valve Vb3 is provided on the second recycled exhaust gas branch line Lb3.

The adsorber 5 has an adsorbent that adsorbs the object to be removed, and the adsorbent is filled therein. The adsorbent contained in the adsorber 5 is configured to repeatedly adsorb and desorb the object to be removed according to the concentration of the object to be removed contained in the regenerated exhaust gas flowing through the regenerated exhaust gas line L3.

For example, when the concentration of the object to be removed contained in the recycled exhaust gas is high and the object to be removed can be adsorbed on the surface of the adsorbent possessed by the adsorber 5, when the recycled exhaust gas flows into the adsorber 5, the adsorbent becomes the adsorbent. The object to be removed is adsorbed. Since the adsorption reaction in which the object to be removed is adsorbed on the adsorbent is an exothermic reaction, heat is generated based on this reaction. As a result, when the regenerated exhaust gas passes through the adsorber 5, thermal energy is generated by the adsorption reaction in the adsorber 5, and the temperature of the gas derived from the adsorber 5 rises.

For example, when the concentration of the object to be removed contained in the recycled exhaust gas is low and the object to be removed is saturated on the surface of the adsorbent possessed by the adsorber 5, when the recycled exhaust gas flows into the adsorber 5, the adsorbent causes the adsorbent. The object to be removed is detached. Since the desorption reaction in which the object to be removed is desorbed from the adsorbent is an endothermic reaction, cold is generated based on this reaction. As a result, when the regenerated exhaust gas passes through the adsorber 5, heat energy is consumed by the desorption reaction in the adsorber 5, and the temperature of the gas derived from the adsorber 5 becomes low.

The heat exchanger 6 can exchange heat between the gas derived from the adsorber 5 of the regenerated exhaust gas line L3 and the regenerated gas flowing on the primary side (upstream side of the regenerated gas) of the connection point p of the regenerated gas line L6. The form is not particularly limited as long as it is in the form.
The regenerated exhaust gas line L3 intersects the regenerated gas line L6 at the position of the heat exchanger 6. That is, the heat exchanger 6 is provided at a position close to the regenerated exhaust gas line L3 and the regenerated gas line L6. As a result, heat can be exchanged between the gas in the regenerated exhaust gas line L3 and the gas in the regenerated gas line L6 while suppressing the loss of heat energy.

For example, when the regenerated gas is supplied to the adsorption tower while being heated by the heater 4 and the regenerated exhaust gas is discharged from the adsorption tower, if the concentration of the object to be removed contained in the regenerated exhaust gas is high, the regenerated gas is derived from the adsorber 5. By exchanging heat between the gas and the regenerated gas flowing toward the connection point p, the heat exchanger 6 can effectively heat the regenerated gas.

For example, when a recycled gas is supplied to cool the adsorbent in the adsorption tower and the recycled exhaust gas is discharged from the adsorption tower, if the concentration of the object to be removed contained in the recycled exhaust gas is low, it is derived from the adsorber 5. The heat exchanger 6 can effectively cool the regenerated gas by exchanging heat between the gas to be produced and the regenerated gas flowing toward the connection point p.

The filling line L5 is a line for increasing the pressure in the suction tower to perform a process called filling. In the charging step, after the object to be removed is desorbed from the adsorbent in the adsorption tower, the pressure in the adsorption tower is raised to a level suitable for purification of the raw material gas.
The first end of the pressure line L5 is branched into the first pressure branch line La5 and the second pressure branch line Lb5, and the second end is connected to the recovery line L4. .. The first charge branch line La5 is connected to the upper side pipe 8a. A valve Va5 is provided in the first charge branch line La5. The second charge branch line Lb5 is connected to the upper pipe 8b. A valve Vb5 is provided on the second charge branch line Lb5.

(Action effect)
Since the gas purification device 1 described above includes the adsorber 5 and the heat exchanger 6, the heat generated by the adsorber 5 due to the adsorption of the object to be removed can be used for heating the regenerated gas, and the energy required for heating the adsorption tower can be reduced. The amount is reduced, that is, the heating efficiency of the adsorption tower is improved. Further, the cold generated by the adsorber due to the desorption of the object to be removed can be used for cooling the regenerated gas, and the cooling efficiency of the adsorption tower is improved.
Further, since the gas purification device 1 is a TSA type device having a simple device configuration, a simple piping configuration, and capable of recovering thermal energy in the same device, the thermal energy of the recycled exhaust gas can be effectively used without waste. It can be recovered, and the recovered thermal energy can be effectively used for regeneration of the adsorbent in the adsorption tower.

<Gas purification method>
Next, an example of the gas purification method of the present embodiment using the gas purification apparatus 1 described above will be described. In the gas purification method of the present embodiment, a case where moisture is removed from air containing moisture as an object to be removed and dry air is purified by the TSA method will be described below as an example.
In the following description, in the gas purification apparatus 1, the gas purification method is applied to the state where the regeneration of the adsorbent in the adsorption tower 3a is completed and the gas purification is completed in the adsorption tower 3b, and the gas is prepared in the adsorption tower 3a. A case where the adsorbent in the adsorption tower 3b is regenerated while purifying will be described as an example.

(Adsorption tower 3a: Purification step, Adsorption tower 3b: Depressurization step)
First, all the valves shown in FIG. 1 are closed. After that, the valves Va1, the valves Va4, and the valves Vb2 are opened. In this state, the raw material gas compressed from the compressor 2 is supplied to the adsorption tower 3a, and the adsorbent in the adsorption tower 3a adsorbs water to purify the gas via the first recovery branch line La4 and the recovery line L4. Collect dry air.
In the suction tower 3b, when the valve Vb2 is opened, the pressure inside the suction tower 3b drops to the vicinity of atmospheric pressure. As a result, the water adsorbed by the adsorbent in the adsorption tower 3b is discharged together with the gas in the adsorption tower 3b via the second decompression branch line Lb2 and the decompression line L2.
In the purification step, the amount of the raw material gas supplied to the adsorption tower 3a is not particularly limited, but can be, for example, 1000 to 50,000 Nm ³ / h. The time for keeping the valve Va1, the valve Va4, and the valve Vb2 in the open state is not particularly limited, but can be, for example, 2 to 20 minutes.

(Adsorption tower 3a: Purification step, Adsorption tower 3b: Heating step)
Next, the valve Vb2 is closed while the valves Va1 and Va4 are open. After that, the valve Vb3, the valve Vb6, and the valve V8 are opened. In this state, the raw material gas is supplied to the adsorption tower 3a, and while recovering the dry air, a part of the dry air is introduced into the heating line L7 as a regenerated gas via the regenerated gas line L6. The dry air in the heating line L7 is heated by the heater 4 and supplied to the adsorption tower 3b via the second regenerated gas branch line Lb6 and the like. As a result, the temperature inside the adsorption tower 3b rises, the water adsorbed by the adsorbent is desorbed, and the air having a high water concentration is discharged from the adsorption tower 3b as recycled exhaust gas. The regenerated exhaust gas is introduced into the adsorber 5 via the second regenerated exhaust gas branch line Lb3 and the regenerated exhaust gas line L3.

When the regenerated exhaust gas having a high water concentration is introduced into the adsorber 5 in the heating step, the water is adsorbed by the adsorbent in the adsorber 5, and the thermal energy associated with the adsorption reaction is generated in the adsorber 5. Therefore, the temperature of the gas derived from the adsorber 5 rises. The heat energy of the gas whose temperature has risen is recovered in the regenerated gas by the heat exchanger 6. As a result, the temperature of the regenerated gas before being introduced into the heater 4 becomes high, and the power required for heating can be reduced.
Here, the time for keeping the valve Va1, the valve Va4, the valve Vb3, the valve Vb6, and the valve V8 in the open state is not particularly limited, but can be, for example, 30 to 180 minutes.
As described above, in the heating step of the adsorption tower 3b, when the adsorbent in the adsorption tower 3b is regenerated, the regenerated exhaust gas containing water is introduced into the adsorber 5, and the water is transferred to the adsorbent in the adsorber 5. The regenerated gas is heated by exchanging heat between the gas derived from the adsorber 5 and the regenerated gas.

(Adsorption tower 3a: Purification process, Adsorption tower 3b: Cooling process)
Next, while the valves Va1, the valves Va4, the valves Vb3, and the valves Vb6 are open, the valves V8 are closed and the valves V7 are opened. In this state, the raw material gas is supplied to the adsorption tower 3a, and while collecting the dry air, a part of the dry air is introduced into the regenerated gas line L6 as a regenerated gas.
The dry air in the regenerated gas line L6 is supplied to the adsorption tower 3b via the valve V7. As a result, the inside of the adsorption tower 3b is cooled by the dry air introduced via the regenerated gas line L6, and the temperature inside the adsorption tower 3b is lowered. Further, since the cooling step is performed after the heating step, water is desorbed from the adsorbent in the adsorption tower 3b. Therefore, the water concentration of the recycled exhaust gas discharged from the adsorption tower 3b in the cooling step becomes low. As a result, in the cooling step, the regenerated exhaust gas having a low water concentration is introduced into the adsorber 5 via the second regenerated exhaust gas branch line Lb3 and the regenerated exhaust gas line L3.

When recycled exhaust gas having a low water concentration is introduced into the adsorber 5 in the cooling step, water is desorbed from the adsorbent in the adsorber 5, and cold accompanying the desorption reaction is generated in the adsorber 5. Therefore, the temperature of the gas derived from the adsorber 5 decreases. The heat energy of the gas whose temperature has dropped is recovered in the regenerated gas by the heat exchanger 6. As a result, the temperature of the regenerated gas before being introduced into the regenerated gas line L6 becomes low. As a result, the cooling efficiency of the adsorption tower 3b is improved, and the amount of regenerated gas required for cooling can be reduced.
Here, the time for keeping the valve Va1, the valve Va4, the valve Vb3, the valve Vb6, and the valve V7 in the open state is not particularly limited, but can be, for example, 60 to 240 minutes.
As described above, in the cooling step of the adsorption tower 3b, the recycled exhaust gas is introduced into the adsorbent 5 having the adsorbent that adsorbs the moisture in the heating step to desorb the moisture from the adsorbent in the adsorber 5. Then, heat is exchanged between the gas derived from the adsorber 5 and the regenerated gas to cool the regenerated gas.

(Adsorption tower 3a: Purification step, Adsorption tower 3b: Filling step)
Next, with the valves Va1 and Va4 open, the valves Vb3, Vb6, and V7 are closed, and the valve Vb5 is opened. In this state, the raw material gas is supplied to the adsorption tower 3a, and while recovering the dry air, a part of the dry air is introduced into the filling line L5 as a filling gas.
The dry air in the charging line L5 is supplied to the adsorption tower 3b via the second charging branch line Lb5 and the like. As a result, the pressure inside the adsorption tower 3b rises to a level suitable for purifying the raw material gas.
Here, the pressure of the adsorption tower 3b after the charging step is not particularly limited, but can be, for example, 300 to 1000 kPaG. The time for keeping the valves Va1, the valves Va4, and the valves Vb5 in the open state is not particularly limited, but can be, for example, 10 to 60 minutes.

The regeneration of the adsorbent in the adsorption tower 3b is completed through the depressurization step, the heating step, the cooling step, and the filling step in the adsorption tower 3b described in order above. Next, in the gas purification method of the present embodiment, by closing the valves Va1 and Va4 and opening the valves Vb1 and Vb4, the purification step is performed in the adsorption tower 3b, and the adsorbent is regenerated in the adsorption tower 3a. good. In this way, the raw material gas can be purified by the TSA method by repeating the purification step and the regeneration of the adsorbent in the adsorption tower between the adsorption tower 3a and the adsorption tower 3b.

(Action effect)
In the gas purification method of the present embodiment described above, since the TSA type gas purification device 1 is used, when the adsorbent in the adsorption tower after refining the raw material gas is regenerated, the object to be removed contained in the regenerated exhaust gas is removed. The concentration increases immediately after the start of regeneration, and the concentration of the object to be removed gradually decreases.
Therefore, according to the gas purification method of the present embodiment, by continuing to supply the regenerated gas to the adsorption tower after purification, the heat and cold generated in the adsorber 5 in the heating step and the cooling step are generated. Can be used in a timely manner. As a result, the adsorption tower can be heated with less energy and the adsorption tower can be cooled with a smaller amount of regenerated gas.

Although some embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments. In addition, the present invention may be added, omitted, replaced, or otherwise modified within the scope of the gist of the present invention described in the claims.
For example, in the embodiment described above, the gas purification apparatus is provided with two adsorption towers, but the number of adsorption towers is not limited to two, and may be one or three or more. You may.
In addition, by installing a cooler that cools the recycled exhaust gas in the recycled exhaust gas line, even if the temperature of the recycled gas becomes excessively high when heating the adsorption tower, the recycled exhaust gas is cooled in the cooling process and heat is generated. The exchanger 6 may be used to ensure that the regenerated gas can be cooled.

1 ... Gas purification device, 2 ... Compressor, 3a, 3b ... Adsorption tower, 4 ... Heater, 5 ... Adsorber, 6 ... Heat exchanger, L1 ... Supply line, L2 ... Decompression line, L3 ... Recycled exhaust gas line , L4 ... Recovery line, L5 ... Charging line, L6 ... Regenerated gas line, L7 ... Heating line, Va1 to Va6, Vb1 to Vb6, V7, V8 ... Valve

Claims (4)

A gas purification device equipped with a recycled exhaust gas line that purifies the gas containing the object to be removed by a temperature fluctuation adsorption method and allows the recycled exhaust gas discharged from the adsorption tower to which the recycled gas is supplied to flow.
An adsorber provided in the recycled exhaust gas line and having an adsorbent that adsorbs an object to be removed,
A heat exchanger that exchanges heat between the gas derived from the adsorber and the regenerated gas.
A gas purification device. The gas purification apparatus according to claim 1, further comprising a regenerated gas line for supplying the regenerated gas to the adsorption tower, and the heat exchanger is provided between the regenerated gas line and the regenerated exhaust gas line. The gas purification apparatus according to claim 1 or 2, wherein a cooler for cooling the recycled exhaust gas is provided in the recycled exhaust gas line. A temperature-variable adsorption type gas purification method using the gas purification apparatus according to any one of claims 1 to 3.
When the adsorbent in the adsorption tower is regenerated, the regenerated exhaust gas containing the object to be removed is introduced into the adsorber, the object to be removed is adsorbed by the adsorbent in the adsorber, and is derived from the adsorber. A heating step of heating the regenerated gas by exchanging heat between the gas and the regenerated gas.
Recycled gas is introduced into the adsorbent having the adsorbent on which the object to be removed is adsorbed in the heating step to desorb the object to be removed from the adsorbent in the adsorber, and the object is derived from the adsorber. A cooling step of cooling the regenerated gas by exchanging heat between the regenerated gas and the regenerated gas.
A gas purification method having.

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