KR100388032B1 - Pre-treatment adsorber for air separation with carbon fiber mat - Google Patents

Abstract

The present invention relates to an adsorption tower (adsorber) used in the deep cooling separation method for producing oxygen and nitrogen in the air, by effectively removing the water and carbon dioxide in the air determined as impurities from the air to produce oxygen and nitrogen before the deep cold separation The present invention relates to an adsorption tower for increasing separation efficiency and improving oxygen and nitrogen productivity.

The present invention provides an active alumina layer and a zeolite molecular sieve inside a casing, and is used in a deep cooling separation method for producing oxygen and nitrogen in air, and has a thermal conductivity between the active alumina layer and the zeolite molecular sieve. By using a good carbon fiber mat placed on the separation plate to improve the heat transfer rate and even distribution of the gas, and to the outer peripheral edge of the carbon fiber mat to mount the heat sink to protrude to the outside of the casing to improve the cooling efficiency It provides an air separation pretreatment adsorption tower having a carbon fiber mat configured to.

Description

PRE-TREATMENT ADSORBER FOR AIR SEPARATION WITH CARBON FIBER MAT}

The present invention relates to an adsorption tower (adsorber) used in the deep cooling separation method for producing oxygen and nitrogen in the air, more specifically, before the deep cold separation of water and carbon dioxide in the air determined as impurities from the air to produce oxygen and nitrogen The present invention relates to an adsorption tower for effectively removing and increasing separation efficiency and improving oxygen and nitrogen productivity.

In general, air has moisture and carbon dioxide in addition to the oxygen and nitrogen contained. When water and carbon dioxide are deep-cold separated, their liquefaction temperature is much higher than that of nitrogen and oxygen, so these components are not removed in advance. Becomes

Therefore, the water and carbon dioxide contained in the air must be completely removed from the air to separate oxygen and nitrogen through the pretreatment apparatus. For this purpose, it was previously removed using a heat exchange method, and then the temperature swing using an adsorption method. It has been removed by adsorption.

In the above-described temperature swing adsorption method, a plurality of adsorption towers filled with an adsorbent for adsorbing water and carbon dioxide are provided, one of which proceeds with the adsorption process, and the other one is heated to regenerate the adsorbent having completed the adsorption operation. . Then, in order to regenerate and use the adsorption tower in the adsorption process, air is introduced into the adsorption tower where the regeneration is completed, and the other is regenerated.

In the temperature swing adsorption method, when the adsorption vessel containing the adsorbent is heated to be regenerated, it is important to increase the working efficiency at this time, and the proper distribution of the gas (carbon dioxide, moisture, etc.) in the adsorption vessel trapped by the adsorbent and This is a temperature transfer phenomenon during heating and regeneration.

At present, as shown in FIG. 1, the lower layer of the adsorption vessel 100 is filled with an active alumina layer 110 for water removal, and the upper layer has a zeolite molecular sieve 120 for removing carbon dioxide. I use it. In addition, an appropriate porous diaphragm 130 is provided between the two active alumina layers 110 and the zeolite molecular sieve 120 to distinguish the two adsorbent layers.

In addition, a conventional method for rapid distribution of moisture and carbon dioxide in the adsorption tower 100 has been proposed, which also proposes a technology for supplying air to the inside from the side of the adsorption tower 100.

In addition, as a conventional method for uniform gas distribution during adsorption and regeneration of water and carbon dioxide, a method of uniformly distributing gas flowing in the adsorption barrel 100 by filling a spherical alumina (not shown) under the adsorbent is also proposed. However, such spherical alumina plays no role in regeneration of the adsorbent.

In particular, during the regeneration of the adsorbent, heated air flows in a direction opposite to that of the adsorption, thereby desorbing and regenerating moisture and carbon dioxide trapped in the adsorbents 110 and 120, wherein the heat transfer rate to the adsorbent is Although it plays a very important role in the desorption rate, it is difficult to expect a change in the heat transfer rate.

The present invention is to solve the conventional problems as described above, the object is

In the process of removing water and carbon dioxide from the air to separate oxygen and nitrogen, the gas distribution inside the adsorption column is made uniform, and heat transfer during the desorption of water and carbon dioxide from the adsorbent increases efficiency, It is an object of the present invention to provide an air separation pretreatment adsorption tower having a carbon fiber mat to improve the productivity of the separate collection operation of oxygen and nitrogen.

1 is a cross-sectional view showing an adsorption tower using a deep cooling method according to the prior art;

2 is a cross-sectional view showing an air separation pretreatment adsorption tower having a carbon fiber mat according to the present invention;

Figure 3 is an exploded perspective view showing a carbon fiber mat and a heat sink provided in the adsorption tower according to the present invention;

Figure 4 is an enlarged cross-sectional view showing a state in which the carbon fiber mat and the porous diaphragm and the heat sinks provided in the adsorption tower according to the present invention is connected to the adsorption tower casing;

5 is a graph showing the results according to Example 1 of the present invention;

6 is a graph showing the results according to the second embodiment of the present invention;

7 is a graph showing the results according to the third embodiment of the present invention;

8 is a graph showing the results according to the fourth embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

5 ..... Casing 10 ..... Carbon fiber mat

20 .... Porous Plate 30 ..... Heatsink

40 .... gas inlet 100 .... adsorption tower

110. Activated Alumina Layer 120 ... Zeolite Molecular Sieve

In order to achieve the above object, the present invention, the active alumina layer in the adsorption tower (adsorber) used in the deep cooling separation method for producing oxygen and nitrogen in the air by having an active alumina layer and a zeolite molecular sieve inside the casing Between the zeolite molecular sieve and using a thermally conductive carbon fiber mat placed on a separation plate to improve the heat transfer rate and even distribution of gas, the outer peripheral edge of the carbon fiber mat is equipped with a heat sink to the outside of the casing By providing an air separation pre-treatment adsorption tower having a carbon fiber mat characterized in that it is configured to improve the cooling efficiency by protruding.

The present invention provides an air separation pretreatment adsorption tower having a carbon fiber mat, characterized in that the distribution of the gas in the adsorption tower is uniform by mounting another carbon fiber mat on the inlet and the outlet side of the casing. By.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 2, the adsorption tower 1 according to the present invention includes an active alumina layer 110 and a zeolite molecular sieve 120 inside the casing 5 to produce oxygen and nitrogen in the air. Used for Adsorber 1 of the present invention, porous carbon fiber mat 10 having a good thermal conductivity between the active alumina layer 110 and the zeolite molecular sieve 120 charged inside the casing 5 It is mounted on the diaphragm 20 and used.

That is, as a diaphragm for distinguishing two kinds of adsorbents, namely, the activated alumina layer 110 and the zeolite molecular sieve 120, a carbon fiber mat 10 and a diaphragm 20 are used, which is an external heat sink 30. Is connected to. This structure has the effect of homogenizing the distribution of gas during adsorption, and when desorption of moisture and carbon dioxide, it uses the high thermal conductivity of carbon fiber, which can shorten the rapid heat conduction and cooling time over the full width of the adsorbent. .

In addition, the heat dissipation plate 30 mounted at the outer circumferential edge of the carbon fiber mat 10 may protrude outward of the casing 5 to improve cooling efficiency.

The carbon fiber mat 10 is located on the disk-shaped porous partition 20, the carbon fiber mat 10 and the porous partition 20 is fixed to the ring-shaped heat sink (30). The diaphragm 20 positioned below the carbon fiber mat 10 supports the load of the zeolite molecular sieve 120 positioned at an upper side thereof to maintain the function of the carbon fiber mat 10. The heat sink 30 is made of a material having good thermal conductivity, such as aluminum or copper, and is sandwiched between the flanges 5a of the casing 5 and through a bolt hole 5b formed in the flange 5a. It is fixed to the casing 5 by being fixed by the inserted bolts (5c), the outer diameter of the heat sink 30 is larger than the outer diameter of the casing 5 protrudes to the outer side of the casing (5) as shown in FIG.

On the other hand, the carbon fiber mat 10 and the diaphragm on the upper portion of the gas inlet tube 40 to further uniformize the gas introduced through the gas inlet tube 40 under the adsorption tower 1 below the active alumina layer 110. It is intended to improve the uniformity of the gas flow by installing the (20), wherein the pressure loss by the carbon fiber mat 10 is negligible.

In order to desorb water and carbon dioxide from the adsorbent, a carbon fiber mat 10 is provided on the upper side of the adsorbent for uniform distribution of the desorbed gas.

Hereinafter, the application effect of the present invention is improved through the distribution of the gas through an embodiment of the present invention.

Example 1 After filling the alumina beads in the lower part of the adsorption layer without using the carbon fiber mat 10 in the air, the dew point change of the outlet air is shown in FIG. . Here, as shown by the curve shown by P1, the dew point decreases slowly, which is due to the fact that the distribution of air is not uniform at the bottom of the adsorption tower. The curve shown as P2 is the temperature of the adsorbent.

Example 2 As a result of removing moisture by putting the same carbon fiber mat 10 as the present invention in the same adsorption tower as Example 1), as shown by the P1 curve in FIG. This is judged to be the result of the distribution of air on the inlet side uniformly distributed over the entire adsorbent by the carbon fiber mat 10.

Example 3

In the case of the adsorption tower provided with the carbon fiber mat 10 according to the present invention, the result of measuring the effect of desorption of water and carbon dioxide is shown in FIG. 7. In FIG. 7, the temperature of the upper part of the adsorption tower rapidly reached the target temperature, and the temperature drop rapidly appeared as shown by the curve shown by P3 even during cooling.

Example 4

As a result of the desorption by the conventional method without installing the carbon fiber mat 10, as shown by P4 in FIG. The temperature drop during cooling is also moderate.

As described above, according to the present invention, in the adsorption tower for removing water and carbon dioxide in the air, the gas distribution is uniformed using the carbon fiber mat 10, and the cooling rate is accelerated. It was dropped quickly and can be shortened by about 60 minutes compared to the adsorption tower without the carbon fiber mat 10, and it can be seen that the effect on the uniform distribution of gas is great.

Therefore, according to the present invention, in the step of removing water and carbon dioxide from the air to separate oxygen and nitrogen, the gas distribution inside the adsorption column is made uniform, and heat transfer is efficiently performed when the moisture and carbon dioxide are desorbed from the adsorbent. In addition, the effect of increasing the separation efficiency and improving the productivity of the separate collection operation of oxygen and nitrogen is obtained.

Claims (3)

In the adsorption tower (adsorber) used in the deep cooling separation method for producing oxygen and nitrogen in the air having an active alumina layer 110 and zeolite molecular sieve 120 in the casing (5), the active alumina layer (110) Between the and the zeolite molecular sieve 120 by using a carbon fiber mat 10 having a good thermal conductivity on the porous diaphragm 20 to improve the heat transfer rate and even distribution of the gas, the carbon fiber mat 10 Air separation pre-treatment adsorption tower having a carbon fiber mat, characterized in that configured to improve the cooling efficiency by mounting the heat sink (30) to the outer peripheral edge of the casing (5). According to claim 1, wherein the heat sink 30 is a material of good thermal conductivity, such as aluminum or copper, the outer diameter of the heat sink 30 is larger than the outer diameter of the casing 5 is configured to protrude to the outer side of the casing (5). Air separation pretreatment adsorption tower having a carbon fiber mat, characterized in that. The lower portion of the active alumina layer 110 is further provided with a carbon fiber mat 10 and a diaphragm 20 to further homogenize the gas introduced through the gas inlet pipe 40, and from the adsorbent In the case of desorption of water and carbon dioxide, an air separation pretreatment adsorption tower having a carbon fiber mat, characterized in that the carbon fiber mat (10) is further installed on top of the adsorbent for uniform distribution of the desorption gas.