JP2009226319A - Gas concentration apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas concentration apparatus which adsorbs air pollutants in the adsorption zone and desorbs the air pollutants from the adsorbent in the regeneration zone, is capable of coping with even gases in low concentrations by increasing the concentration rate, allows saving of the operation energy by using a single heater and prevents enlargement of the apparatus. <P>SOLUTION: The gas concentration apparatus rotates a rotor with an adsorbent supported in a honeycomb structure, causing a target gas to pass through the rotor in an adsorption zone so as to recover the gas as a purified gas and causing a high-temperature gas to pass through the rotor in a regeneration zone so as to desorb air pollutants from the adsorbent and recover as a concentrated gas. The apparatus has the adsorption zone, a preheating zone, the regeneration zone and a cooling zone. The gas discharged from the cooling zone is supplied directly to the preheating zone, and the gas discharged from the preheating zone is heated and then allowed to flow into the regeneration zone so as to obtain the concentrated gas. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for obtaining a purified gas by adsorbing an air pollutant such as an organic solvent contained in a gas with an adsorbent and collecting the air pollutant from the adsorbent as a concentrated gas.

  Air pollution substances such as organic solvents are used in painting factories, printing factories, semiconductor manufacturing factories, liquid crystal device manufacturing factories, and the like. Since air pollutants must be at a concentration below the atmospheric emission standard, these factories send air containing air pollutants to the gas concentrator, remove the air pollutants, and then bring clean air into the air. It is discharged or supplied to the factory.

  As such a gas concentrator, a system is known in which air containing air pollutants is passed through an adsorbing element carrying an adsorbent, and the air pollutants are adsorbed and removed by the adsorbent to obtain clean air. FIG. 4 is a schematic diagram illustrating an example of a gas concentrator (see, for example, Patent Document 1). As shown in the figure, the rotor 1 has an adsorbent supported on a honeycomb structure, and is accommodated in a case (not shown) so as to be rotatable about an axis. A partition plate 6 extending radially from the axis (rotation axis) of the rotor 1 is disposed in the case, and the adjacent partition plate 6 separates the planar portion of the rotor 1 from the adsorption zone 5, the regeneration zone 4, and the cooling. Define in zone 7. In the present invention, a part of the rotor in each zone is called a low segment. The rotor 1 is driven by the motor M and rotated in the direction of the arrow, and the rotor segment that has passed through the adsorption zone 5 moves to the regeneration zone 4 and then the cooling zone 7 and then reaches the adsorption zone 5 again.

  Air (treated gas) A containing air pollutants is supplied to one surface of the rotor 1 in the adsorption zone 5. And while passing a rotor segment, an air pollutant is adsorb | sucked by adsorption agent and clean air (purified gas) a is obtained.

  At the same time, a cooling gas P (generally air) is supplied to the cooling zone 7 from the same side as the air containing air pollutants, and the cooling gas Pa that has passed through the rotor segment is heated by the heater H and heated. After being changed to air R, it is supplied to the regeneration zone 4. In the regeneration zone 4, the rotor segment is heated by the heated gas R, the air pollutant is desorbed from the adsorbent, and the gas (concentrated gas) S containing the desorbed air pollutant is discharged. The concentration rate of air pollutants in the regeneration zone 4 is several times to several tens of times, and the concentrated gas S is sent to an external post-processing device for processing.

  In the gas concentrator having such a configuration, the adsorption of air pollutants in the adsorption zone 5 and the regeneration of the adsorbent in the regeneration sone 4 are simultaneously performed, and continuous processing is possible. At this time, since the rotor segment becomes hot due to the heated gas R in the regeneration zone 4, the rotor segment that has moved in the cooling zone 7 is cooled by the cooling gas P to prevent a decrease in the adsorption efficiency in the adsorption zone 5. Yes.

  The gas concentrator described above is suitable for treating air containing a relatively high concentration organic solvent, such as a coating factory or a printing factory. For example, in a printing factory, since the concentration of the discharged organic solvent is several tens to several hundred ppm, when concentrated about 10 times in the regeneration zone 4, a concentrated gas S of several hundred to several thousand ppm is obtained. The concentration is efficient for processing by the processing apparatus.

  However, in semiconductor manufacturing factories and liquid crystal device manufacturing factories, the organic solvent emission concentration may be about several ppm. In that case, even if it is concentrated about 10 times, the concentration that is efficient for processing in the post-processing device Must not. Therefore, in order to increase the concentration rate, as shown in FIG. 5, the regeneration zone 4 is divided into two, and the cooling gas Pa that has passed through the cooling zone 7 is heated by the first heater H1 to become the heating gas R1, The heated gas R1 is sent to the first regeneration zone 4a, and the heated gas R1a that has passed through the first regeneration zone 4a is heated by the second heater H2 to become the heated gas R2, and then the second regeneration is performed. It has been proposed to supply to the zone 4b (see, for example, Patent Document 2).

  In such a gas concentrator, since there are two regeneration zones, the amount of air pollutants desorbed from the adsorbent is large, resulting in a concentrated gas S having a higher concentration. However, on the other hand, since two heaters are required, there is a problem that energy loss is large and the entire apparatus becomes large.

JP-A-7-75714 JP-A-7-88317

  Therefore, the present invention provides a gas concentrator configured to adsorb air pollutants in the adsorption zone and to desorb air pollutants from the adsorbent in the regeneration zone, thereby increasing the concentration rate and reducing the air pollutants to the gas to be treated. In addition, it is intended to reduce the operating energy and prevent the apparatus from becoming large by using a single heater.

  In order to achieve the above object, the present invention rotates a rotary rotor in which an adsorbent is supported on a honeycomb structure, passes a gas to be treated through the rotor in the adsorption zone, collects it as purified gas, and regenerates it. A device for passing a high-temperature gas through a rotor in a zone to desorb an adsorbate from the adsorbent and recovering a concentrated gas containing the desorbed adsorbent, and comprising a honeycomb structure carrying the adsorbent The rotor is rotatably supported around the rotor axis, and is provided opposite to the rotor end surface, and extends radially from the rotor axis as a starting point. The rotor is in the adsorption zone, preheating zone, regeneration zone, and cooling. A holding case having partition plates defined in the order of the zones, a rotating means for rotating the rotor, a path for supplying the gas to be processed to the adsorption zone, and an adsorption zone A flow path for supplying exhausted purified gas to the outside, a flow path for supplying cooling gas to the cooling zone, a flow path for supplying gas discharged from the cooling zone directly to the preheating zone, and a discharge path from the preheating zone A gas concentrating device is provided, comprising: a flow path for supplying the regeneration gas to the regeneration zone, and a flow path for supplying the concentrated gas discharged from the regeneration zone to an external processing apparatus.

  The gas concentrator of the present invention is capable of efficiently desorbing adsorbate from the adsorbent in the regeneration zone by sending the gas that has passed through the cooling zone to the preheating zone as it is without heating, and is excellent in purification performance. In addition, the concentration rate of the concentrated gas discharged from the regeneration zone can be increased. For example, when the gas to be treated is toluene, the apparatus has a concentration of 10 to 20 times the concentration of the solvent after processing a low concentration organic gas of about 150 ppm or less, such as a solvent concentration of 3000 ppm or less. The later concentration is about 1/4 to 1/5 of the explosion limit, and no explosion-proof equipment is required. Moreover, it is not necessary to heat the gas supplied to the preheating zone, and an increase in operating cost can be reduced. Furthermore, since the amount of processing air becomes small, the subsequent combustor or the recovery machine can be made small, and there is a great effect in downsizing, running cost reduction, installation space reduction, and weight reduction. In particular, when purifying exhaust gas that has been exhausted directly because of its low concentration, it will be installed in an existing factory. In such cases, it is generally installed on the roof of a building. It is important to be lightweight, compact.

  Hereinafter, the present invention will be described in detail.

  As shown in FIG. 1, the gas concentrator of the present invention is similar to the gas concentrator shown in FIG. 2 and FIG. 3 in that a rotor 1 having an adsorbent supported on a honeycomb structure is rotated by a motor M and partitioned. In this configuration, each zone defined by the plate 6 is passed.

  The honeycomb structure of the rotor 1 preferably has heat resistance and wear resistance so that it can withstand the passage of the high temperature gas A, and for example, inorganic fiber paper formed into a honeycomb shape is preferable. The adsorbent is selected according to the substance to be removed. For example, a synthetic zeolitic adsorbent is preferable for removing the organic solvent, and is held on the surface of the honeycomb structure by an inorganic binder such as silica sol.

  The rotor 1 is housed in a case (not shown) and is rotatably supported. In addition, the kaes define the flat portion of the rotor 1 in the order of the adsorption zone 5, the preheating zone 10, the regeneration zone 4, and the cooling zone 7 by the partition plate 6 extending radially from the axis (rotation axis) of the rotor 1. ing. The rotor 1 is driven by the motor M and rotated in the direction of the arrow, and the rotor segment that has passed through the adsorption zone 5 moves in the order of the preheating zone 10, the regeneration zone 4, and the cooling zone 7, and then enters the adsorption zone 5 again. Repeat the arriving cycle.

  Further, the partition plate 6 may be subjected to a heat shielding / heat insulation treatment in order to impart heat resistance.

  A gas to be treated A containing an air pollutant such as an organic solvent is supplied from one side of the rotor 1 in the adsorption zone 5, and the air pollutant is adsorbed by the adsorbent while passing through the rotor segment. It is discharged as purified gas a from the side. This purified gas a is discharged into the atmosphere or supplied into the factory.

A cooling gas P is supplied to the cooling zone 7 from the same side as the gas A to be processed, and passes through the rotor segment. Since the high-temperature rotor segment heated in the regeneration zone 4 is transferred to the cooling zone 7, the cooling gas P is heat-exchanged while passing through the cooling zone 7, and is cooled from the cooling zone 7. The working gas (hereinafter referred to as warm air) Pa is discharged. This warm air Pa can be controlled by the temperature of the rotor segment in the regeneration zone 4, the temperature of the cooling gas P, and the wind speed. For example, in the regeneration zone 4, a high temperature gas close to 200 ° C. is generally supplied for efficient desorption, but when a cooling gas P of 20 ° C. is supplied at 5 m ³ / min, it is close to 100 ° C. Warm-up Pa can be achieved.

  The warm air Pa is sent to the preheating zone 10 as it is, and heats the rotor segment that has moved from the adsorption zone 5 to the preheating zone 10. Then, the warm air Pb that has passed through the preheating zone 10 is heated by the heater H to a temperature required for desorption in the regeneration zone 4 (about 200 ° C.), supplied as heating gas R to the regeneration zone 4, and desorbed. To be served. Then, the concentrated gas S containing the desorbed air pollutants is discharged from the regeneration zone 4 and sent to an external processing device (not shown).

  In the above, the flow paths of the warm air Pa and Pb and the heated gas R are insulated to suppress the temperature drop during the passage.

  In the gas concentrator of the present invention configured as described above, since the rotor segment is preheated in the preheating zone 10 by the warm air Pa obtained by passing through the cooling zone 7, desorption in the regeneration zone 4 is efficiently performed. And the concentration rate is increased. In addition, unlike the gas concentrating device shown in FIG. 4, it is not necessary to heat the cooling gas Pa that has passed through the cooling zone 7, and the first heater H1 is not required. There is no invitation.

  In the gas concentrator, the gas A to be processed may be branched and a part thereof may be supplied as the cooling gas P.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is further demonstrated, this invention is not restrict | limited at all by this.

Example 1
A synthetic zeolite was supported on a honeycomb structure made of inorganic fibers to produce a rotor. And as shown in FIG. 1, while supporting a rotor rotatably to a case, a plane part is made into the adsorption zone 270 degrees, the preheating zone 30 degrees, the regeneration zone 30 degrees, and the cooling zone 30 degrees with a partition plate. Defined. Then, the rotor was rotated at 2 rph, and air containing 18.8 ppm of cyclohexanone (19.2 ° C., humidity 37.1 RH%) in the adsorption zone was 15.71 m ³ / min (processed surface speed 2.74 m / s). ) Continuously. Then, the cyclohexanone was adsorbed through the rotor segment, and purified air (21.4 ° C.) having a cyclohexanone concentration of 5.2 pmm was obtained at 14.73 m ³ / min. The purification performance is 93.4%.

Moreover, the to-be-treated gas supplied to the adsorption zone was branched, and a part (0.98 m ³ / min) was supplied to the cooling zone as a cooling gas. The temperature of the gas that passed through the cooling zone was 93.6 ° C. This gas was directly supplied to the preheating zone, and the rotor segment that had transitioned from the adsorption zone to the preheating zone was heated. And the temperature of the gas discharged | emitted from the preheating zone was 26.4 degreeC, and after raising this to 200 degreeC with a heater, it supplied to the regeneration zone. From the regeneration zone, a concentrated gas (43.7 ° C.) having a cyclohexanone concentration of 70 ppm was obtained at a rate of 0.98 m ³ / min. The concentration rate is 15 times.

  The flow path, the air volume at each part, the gas temperature, and the cyclohexanone concentration in Example 1 are shown in FIG.

(Comparative Example 1)
As shown in FIG. 4, a rotor equivalent to that in Example 1 was defined by a partition plate into an endothermic zone (270 °), a regeneration zone (45 °), and a cooling zone (45 °). Then, the rotor was rotated at 2 rph, and the air containing 9.5 ppm of cyclohexanone (9.5 ° C., humidity 53.4 RH%) in the adsorption zone was changed to a flow rate of 15.71 m ³ / min (processing surface speed 2.74 m / s). Continuously. Then, purified air (13.6 ° C.) having a cyclohexanone concentration of 6.9 pmm was obtained at 14.73 m ³ / min through the rotor segment. The purification performance is 90.5%.

Further, a part of the gas to be treated (0.98 m ³ / min) was divided and supplied as a cooling gas to the cooling zone. The temperature of the gas that passed through the cooling zone was 64.9 ° C. This gas was heated to 200 ° C. by a heater and then supplied to the regeneration zone. From the regeneration zone, a concentrated gas (30.3 ° C.) having a cyclohexanone concentration of 70 ppm was obtained at a rate of 0.98 m ³ / min. The concentration rate is 15 times the same as in Example 1.

  The flow path in this comparative example 1, the air volume in each part, gas temperature, and cyclohexanone concentration are shown in FIG.

  As described above, in Example 1 according to the present invention, the purification performance is higher than that in Comparative Example 1. This is because the rotor segment that has moved from the adsorption zone to the preheating zone is heated by the high-temperature (93.6 ° C.) gas discharged from the cooling zone, so that desorption by the heated gas in the regeneration zone can be performed more efficiently. Means that

  Thus, according to the present invention, the processing capacity can be improved by sending the gas that has passed through the cooling zone to the preheating zone as it is without heating.

It is a schematic diagram which shows the structure of the gas concentrator of this invention. It is a schematic diagram which shows the flow path in Example 1, the air volume in each part, gas temperature, and a cyclohexanone density | concentration. It is a schematic diagram which shows the flow path in the comparative example 1, the air volume in each part, gas temperature, and a cyclohexanone density | concentration. It is a schematic diagram which shows the structure of the conventional gas concentration apparatus. It is a schematic diagram which shows the structure of the other conventional gas concentration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 4 Regeneration zone 5 Adsorption zone 6 Partition plate 7 Cooling zone 10 Preheating zone A Processed gas a Purified gas
P Cooling gas R Heating device H Heater S Concentrated gas

Claims (2)

A rotary rotor having an adsorbent supported on a honeycomb structure is rotated, and the gas to be treated is passed through the rotor in the adsorption zone to be recovered as a purified gas, and the high temperature gas is passed through the rotor in the regeneration zone to be adsorbed. An apparatus for desorbing an adsorbate from the gas and recovering a concentrated gas containing the desorbed adsorbent,
A rotor configured to carry an adsorbent on a honeycomb structure;
The rotor is rotatably supported around the rotor axis, and is provided opposite to the rotor end surface. The rotor extends radially from the rotor axis, and the rotor is divided into an adsorption zone, a preheating zone, a regeneration zone, and a cooling zone. A holding case having partition plates that are defined in order;
A rotating means for rotating the rotor;
A path for supplying the gas to be treated to the adsorption zone;
A flow path for supplying purified gas discharged from the adsorption zone to the outside;
A flow path for supplying a cooling gas to the cooling zone;
A flow path for directly supplying the gas discharged from the cooling zone to the preheating zone;
A flow path for supplying gas to the regeneration zone after heating the gas discharged from the preheating zone;
A flow path for supplying concentrated gas discharged from the regeneration zone to an external processing device;
A gas concentrating device comprising:   The gas concentrator according to claim 1, further comprising a flow path for branching the gas to be processed and supplying a part of the gas to be processed to the cooling zone as a cooling gas.

Images