JP2005246353A - Gas reforming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas reforming apparatus efficiently removing harmful substances and moisture in gas to improve performance. <P>SOLUTION: Plasma is generated with a part of gaseous molecules electrodissociated by applying a pulse voltage or A.C. voltage from a power source 8, and an electrode group 4 is arranged to expose the plasma to air flow in a duct 2. An appropriate electric field is formed between the electrode group 4 and collection parts 2, 3 by the electrode group 4 with D.C. bias of a negative potential applied and the grounded collection parts 2, 3. Negative ions are drawn out to the collection parts 2, 3 by the electric field, and brought into contact with water molecules and the harmful substances in the gas to increase formation amount of cluster with the water molecules and harmful substances attached to periphery with ions as nuclei. The cluster is drawn out to water film on the collection parts 2, 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gas reforming apparatus.

Conventionally, as a detoxifying device that removes harmful substances in gas, a DC high voltage is applied to the negative electrode to generate corona discharge, and electrons generated by this corona discharge are trapped in gas molecules such as oxygen and harmful substances. In addition to generating negative ions, these negative ions are attached to harmful substances and water molecules to form clusters, and these negative ions and clusters are collected at the positive electrode (for example, see Non-Patent Document 1). ).
Satoshi Tamon "Gas phase contaminant removal using corona discharge, Chemical Engineering Vol. 66, No. 12, 2002, p.750-p.753"

  However, in such an abatement apparatus, the amount of negative ions formed is small, the negative ions generated by corona discharge move at a high speed due to a strong electric field, and there are few opportunities to capture harmful substances. There is a problem that it cannot be removed efficiently.

  The present invention has been made in order to solve the above-mentioned problems, and is capable of efficiently removing harmful substances in the gas and removing moisture in the gas to improve the performance. An object is to provide an apparatus.

  A gas reforming apparatus according to the present invention includes a flow path through which a gas containing water molecules flows, a pulse voltage or an AC voltage applied to the flow path to generate plasma, and the plasma is exposed to the gas. And a collector having a grounded conductor provided in the flow path, and the electrode pair uses the one electrode of the electrode pair as a reference electrode, and the potential of the reference electrode is a positive potential. Alternatively, a DC bias having a negative potential is applied.

  According to the gas reforming apparatus configured as described above, a plasma in which a pulse voltage or an alternating voltage is applied to generate a discharge and a part of gas molecules is ionized is generated, and this plasma is exposed to the gas in the flow path. An electrode pair is disposed on the substrate. In addition, an electrode pair including a reference electrode to which a positive potential or a negative potential DC bias is applied and a collecting unit provided in a flow path and grounded, can provide an appropriate electric field between the electrode pair and the collecting unit. Due to the electric field thus formed, ions in the plasma are extracted at a low speed toward the collection part, and the ions come into contact with water molecules and harmful substances in the gas, and the ions are used as the nuclei. The amount of clusters with water molecules or harmful substances attached thereto is increased, and these ions and clusters are collected in the water film on the collection part.

  Here, as a configuration of the collection unit that exhibits the above-described action, specifically, a configuration in which the collection unit is an inner wall of the flow path is exemplified, and ions generated by the electrode pair are generated by the electrode pair and the inner wall of the flow path. Are drawn out toward the inner wall of the flow path by the electric field formed between the two and collected together with the cluster.

  In addition, as a configuration of the collection unit that effectively exhibits the above-described operation, specifically, a configuration in which the collection unit includes a grounding grid disposed on the upstream side of the electrode pair can be cited. The ions generated in the above are drawn to the upstream side at a low speed against the gas flow by the electric field formed between the electrode pair and the grounding grid, and the ions are used as clusters to attach water molecules and harmful substances to the surroundings. The production amount of is increased. In addition, ions and clusters drawn further upstream by the grounding grid are collected in a water film on the grounding grid. In addition, the cluster whose mass is increased and mobility due to the electric field is lowered is returned toward the electrode pair by the gas flow and flows into the plasma, and the dissociation of water molecules due to collision between the electrons in the plasma and the cluster is promoted. OH radicals are generated. This OH radical contacts a harmful substance and decomposes the harmful substance.

  In addition, as a configuration that effectively exhibits the above-described operation, specifically, a grid electrode that is arranged downstream of the reference electrode and to which a DC voltage is applied is provided, and when the potential of the reference electrode is a positive potential, When the potential of the grid electrode is a potential having a positive potential difference from the potential of the reference electrode, and the potential of the reference electrode is a negative potential, the potential of the grid electrode has a negative potential difference from the potential of the reference electrode An example of the configuration is a potential. When the voltage applied to the electrode pair is 0 V due to the gas flow, the cluster flowed downstream from the electrode pair is pushed back upstream by the electric field formed between the electrode pair and the grid electrode. OH radicals are generated by flowing into the plasma. This OH radical contacts a harmful substance and decomposes the harmful substance.

  In addition, the collection unit may have a ground grid disposed on the downstream side of the electrode pair. With this configuration, ions generated by the electrode pair are generated between the electrode pair and the ground grid. Ions are drawn out to the downstream side of the electrode pair by the electric field formed between them, and the massive clusters and mist with increased mass are charged by the ions and collected by the ground grid disposed downstream.

  Further, as a configuration that effectively exhibits the above-described operation, specifically, when a plurality of electrode pairs are arranged in parallel in the gas flow direction and the potential of the reference electrode is a positive potential, the potential of the reference electrode is When the potential of the reference electrode is a negative potential in order in the gas flow direction and the potential of the reference electrode is a negative potential, the potential of the reference electrode is the potential having a potential difference on the negative side in the gas flow direction. A configuration is mentioned, and these parallel electrode pairs increase the generation amount of ions and increase the generation amount of clusters. These ions and clusters are collected in a water film on a collection unit provided in the flow path.

  Here, when a photocatalyst coating capable of forming a water film when applied with ultraviolet rays is applied to the collection part, a water film is suitably formed on the collection part by ultraviolet rays from plasma, and ions, Clusters and decomposition products are collected in the water film.

  Furthermore, if the flow path is provided with a drain port that can discharge the water in the flow path, the water remaining in the flow path is discharged well.

  As described above, according to the gas reforming apparatus of the present invention, the amount of ions and clusters produced by adhering water molecules and harmful substances around the ions as the nucleus is increased, and these ions and clusters are collected. As a result, harmful substances in the gas are efficiently removed, and moisture in the gas is removed, thereby improving the performance.

  Hereinafter, a preferred embodiment of a gas reforming apparatus according to the present invention will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a schematic configuration diagram showing a gas reforming apparatus according to a first embodiment of the present invention, and FIGS. 2 and 3 are diagrams showing potentials at respective electrodes in FIG.

  As shown in FIG. 1, the gas reformer 1 of this embodiment is installed in, for example, a sewage treatment plant, and is applied to deodorization and dehumidification of air containing water vapor and hydrogen sulfide evaporated from sewage. is there. This gas reformer 1 generally includes an electrode set (electrode pair) 4 for generating plasma in a duct (flow path) 2 into which air to be processed flows, and negative ions generated by the plasma are converted into water. A cluster is generated by contact with a molecule and a harmful substance, and the cluster or the like is collected by a collection unit.

  The duct 2 is made of a conductor such as carbon steel or stainless steel, and has a rectangular tube shape or a cylindrical shape. Inside the duct 2, the ground grid 3, the electrode set 4, and the grid electrode 5 are arranged in the air flow direction G. It is provided side by side along. The duct 2 is provided with a siphon-type drain nozzle (drain port) 10 for discharging the internal drain to the outside of the system.

  The ground grid 3 and the grid electrode 5 are made of a conductor such as carbon steel or stainless steel, have a lattice shape, have a size corresponding to the cross section of the duct 2, and face the air flow direction G. Has been placed.

  The electrode set 4 includes a metal reference electrode 6 and an excitation electrode 7, and the reference electrode 6 and the excitation electrode 7 each have a rod shape and have a length corresponding to the transverse section of the duct 2. A plurality of lines are alternately arranged in a direction orthogonal to the direction G. The quantity of the reference electrode 6 and the excitation electrode 7 is set so that the plasma generated between these electrodes 6 and 7 contacts the entire air flow passing through the duct 2.

  The collection unit includes an inner wall of the duct 2 and a grounding grid 3 and is grounded. Further, a titanium oxide photocatalyst coating that forms a water film when irradiated with ultraviolet rays is applied to the surfaces of the collection parts 2 and 3, and a suitable water film is formed by ultraviolet rays from plasma.

  Next, connection between the electrode set 4 and the grid electrode 5 and each power source will be described. In the electrode set 4, the reference electrode 6 is connected to the negative terminal of the DC power supply 11 and the high-frequency (AC) power supply 8 to be a predetermined negative potential (see FIG. 2), and the excitation electrode 7 is connected to the high-frequency power supply 8. The potential shown in FIG. 2 is obtained, and plasma is generated between the excitation electrode 7 and the reference electrode 6 adjacent thereto. Incidentally, when the power supply 8 is a pulse power supply, the reference electrode 6 and the excitation electrode 7 are set to the potential shown in FIG.

  The grid electrode 5 is connected to the negative terminal of the DC power source 12 as shown in FIG. 1, and is set to a predetermined potential having a potential difference on the negative side of the potential of the reference electrode 6 as shown in FIGS. Yes.

  That is, when the power source 8 is a high frequency power source, the inner wall of the duct 2, the ground grid 3, the reference electrode 6, and the grid electrode 5 are sequentially set to potentials having a potential difference on the negative side as shown in FIG.

  Similarly, when the power source 8 is a pulse power source, the inner wall of the duct 2, the ground grid 3, the reference electrode 6, and the grid electrode 5 are sequentially set to potentials having a potential difference on the negative side as shown in FIG.

According to the gas reforming apparatus 1 configured as described above, a pulse voltage or an alternating voltage is applied by the power supply 8, and a part of gas molecules is ionized between the reference electrode 6 and the excitation electrode 7 by discharge. The electrode set 4 is arranged so that plasma is generated and the plasma is exposed to the air flow in the duct 2. In the plasma, for example, oxygen molecules, nitrogen molecules, and water molecules in the air are ionized to form positive ions to release electrons, and ozone, oxygen molecules, radicals, etc. capture electrons to form negative ions. To do. Also, hydrogen sulfide, which is the main component of malodor, becomes negative ions, and many other malodorous substances become negative ions. In addition, the electrode set 4 including the reference electrode 6 to which a negative direct current bias is applied and the collectors 2 and 3 that are grounded are suitable between the electrode set 4 and the collectors 2 and 3. An electric field is formed. Due to the electric field thus formed, the negative ions generated in the electrode set 4 are drawn out at a low speed upstream against the air flow. During this movement, water molecules in the air come into contact with negative ions to form clusters. Further, a harmful substance comes into contact with this cluster to form a cluster having a harmful substance attached to the surroundings. In particular, when a harmful substance comes into contact with a negative ion such as O ⁻ , OH ⁻ , O ₂ ⁻ , O ₃ ^−, or a cluster having these negative ions as nuclei, it is captured by these negative ions and clusters. Examples of harmful substances captured by these negative ions and clusters include sulfur compounds, acetaldehyde, and methyl iodide.

  Negative ions and clusters are drawn toward the collection parts 2 and 3 by an electric field formed between the electrode assembly 4 and the collection parts 2 and 3. Specifically, the inner wall of the duct 2, the ground grid 3 And is collected in the water film on the collection parts 2 and 3 and flows down by gravity, passes through the drain nozzle 10 and is discharged out of the system. In other words, clusters with harmful substances attached are absorbed by the water film and discharged out of the system.

  The air flow that has passed through the ground grid 3 flows into the plasma of the electrode assembly 4, and the clusters in which a large amount of water molecules are attached and the mobility due to the electric field is lowered are also downstream of the ground grid 3 by the air flow. Flow into the plasma of the electrode set 4.

  Electrons having various energies exist in the plasma of the electrode set 4, and even if the electrons do not cause dissociation of the water molecules because the energy is too large even when colliding with a single water molecule, Collisions cause water molecules to dissociate. Specifically, the electrons collide with the clusters, the energy is consumed for vibration and excitation of water molecules, and the electrons have energy suitable for molecular dissociation. Thereby, dissociation of water molecules occurs easily and OH radicals are generated. In addition, O radicals generated by dissociation of oxygen molecules react with the water molecules of the cluster to generate OH radicals. These increase the amount of OH radicals produced. O radicals react with oxygen molecules to generate ozone.

  These OH radicals have extremely strong oxidizing power, and come into contact with the harmful substances in the air and the harmful substances attached to the clusters in a chain reaction to decompose these harmful substances. Ozone also decomposes harmful substances. Incidentally, examples of harmful substances decomposed by ozone include iodine compounds, skatole and trimethylamine.

  The air flow passes through the electrode set 4, and when the voltage applied to the electrode set 4 is 0 V, the negative ions and the clusters centering on the negative ions flowed from the electrode set 4 are formed between the electrode set 4 and the grid electrode 5. The electric field formed between them is pushed back upstream against the air flow and flows into the plasma, the amount of clusters in the plasma is increased, the dissociation of water molecules due to collisions between electrons and clusters is promoted, and OH The amount of radicals generated is increased.

  As described above, in the present embodiment, a pulse voltage or an alternating voltage is applied, and a plasma in which part of gas molecules is ionized by discharge is generated between the reference electrode 6 and the excitation electrode 7. Electrons attach to oxygen molecules and OH radicals to generate negative ions. The negative ions are extracted toward the collection units 2 and 3 by the electric field formed between the electrode assembly 4 and the collection units 2 and 3, generate clusters, and are collected by the collection units 2 and 3. Be collected. As a result, harmful substances in the air are efficiently removed, moisture in the air is removed, and performance is improved.

  Further, in the present embodiment, the electrode set 4 including the reference electrode 6 to which a negative direct current DC bias is applied and the grounded collection units 2 and 3, and these electrode sets 4 and the collection units 2 and 3 An appropriate potential difference occurs between As a result, an electric field is formed with a simple configuration.

  Moreover, in this embodiment, since the collection parts 2 and 3 include the duct 2 inner wall, the wide collection parts 2 and 3 can be obtained easily. As a result, the performance of removing harmful substances and moisture is further improved.

  In particular, in the present embodiment, since the grounding grid 3 is provided as a collection part, the negative ions generated by the electrode assembly 4 are drawn out to the upstream side at a low speed against the air flow, and the negative ions are extracted. The amount of clusters generated as nuclei is increased, and this cluster flows into the plasma of the electrode assembly 4 by the gas flow, generating OH radicals and negative ions. As a result, the removal efficiency of harmful substances and moisture is further improved.

  Incidentally, in the gas reforming apparatus 1 of the present embodiment, the electric field strength formed between the electrode set 4 and the collection parts 2 and 3 is set to 100 to 1000 V / cm, and the moving speed of negative ions is 2 When it is set to -20 m / s, harmful substances and moisture are removed well.

  Further, in the present embodiment, the negative ions and clusters flowed downstream from the electrode set 4 are pushed back upstream by the electric field formed between the electrode set 4 and the grid electrode 5 against the air flow. This flows into the plasma, generating OH radicals and negative ions. As a result, the removal efficiency of harmful substances and moisture is further improved.

  FIG. 4 is a schematic configuration diagram showing a gas reforming apparatus according to the second embodiment of the present invention. The gas reforming apparatus 21 of the second embodiment is different from the gas reforming apparatus 1 of the first embodiment in that an electrode set and a plurality of power supplies connected to the electrode set are provided.

  That is, the gas reformer 21 includes the electrode sets 4a to 4c arranged in parallel along the air flow direction G, and the reference electrodes 6a to 6c have negative potentials downstream of the air flow direction G. The potentials of the ground grid 3, the reference electrodes 6a to 6c, and the grid electrode 5 are sequentially negative toward the downstream side in the air flow direction G. The potential has a potential difference.

  If comprised in this way, since the electrode sets 4a-4c are provided with two or more, the production | generation amount of a negative ion is increased by these electrode sets 4a-4c arranged in parallel. As a result, harmful substances are further removed as compared with the first embodiment, and performance is improved.

  FIG. 5 is a schematic configuration diagram showing a gas reforming apparatus according to the third embodiment of the present invention. The gas reforming device 31 of the third embodiment is different from the gas reforming device 1 of the first embodiment in that, instead of the grid electrode 5 shown in FIG. This is also provided on the downstream side of the set 4.

  If comprised in this way, a negative ion will be drawn out also to the downstream of the electrode group 4, and the huge cluster and mist which mass increased will be negatively charged, and will also be collected by the grounding grid 3 arrange | positioned downstream. As a result, moisture is further removed as compared with the first embodiment, and performance is improved.

  FIG. 6 is a schematic configuration diagram showing a gas reforming apparatus according to the fourth embodiment of the present invention. The difference between the gas reforming device 41 of the fourth embodiment and the gas reforming device 31 of the third embodiment is that the third embodiment is further downstream than the ground grid 3 disposed on the downstream side shown in FIG. The same electrode set 4 and grounding grid 3 as those in FIG. 6 are provided in parallel along the air flow direction G.

  If comprised in this way, since the electrode set 4 and the grounding grid 3 are increased, the production amount of negative ions and the collection parts 2 and 3 are increased. As a result, harmful substances and moisture are further removed as compared with the third embodiment, and performance is improved.

  As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment. For example, in the gas reforming apparatuses 1, 31, and 41 of the above embodiment, the reference electrode 6 is connected to the negative terminal of the DC power supply 11 to have a negative potential, but the reference electrode 6 is connected to the DC power supply 11. The positive terminal may be connected to the positive terminal. If comprised in this way, a positive ion will be drawn out toward the collection parts 2 and 3 by the electric field formed between the electrode group 4 and the collection parts 2 and 3, and a positive ion will be the water molecule in air and The generation amount of clusters in which water molecules and harmful substances adhere to the surroundings with positive ions as nuclei in contact with harmful substances is increased, and these positive ions and clusters are generated in the water formed on the collection parts 2 and 3. Collected in the membrane. As a result, harmful substances in the air are efficiently removed, moisture in the air is removed, and performance is improved. Further, in the gas reforming apparatus 1 that draws out such positive ions toward the collection units 2 and 3, the grid electrode 5 is connected to the positive terminal of the DC power source 12, and the positive side from the potential of the reference electrode 6. A potential having a potential difference of In this way, when the voltage applied to the electrode set 4 is 0 V due to the air flow, the cluster flowed downstream from the electrode set 4 is caused by the electric field formed between the electrode set 4 and the grid electrode 5. Against the flow, it is pushed back upstream and flows into the plasma, the amount of clusters in the plasma is increased, the dissociation of water molecules due to collisions between electrons and clusters is promoted, OH radicals are generated and negative ions are also generated Generated. As a result, the removal efficiency of harmful substances and moisture is further improved.

  Moreover, in the said 2nd Embodiment, the gas reforming apparatus 21 has an electric potential difference in the negative side in order toward the downstream of the air flow direction G about the electric potential of the ground grid 3, the reference electrodes 6a-6c, and the grid electrode 5. Although it is set as the structure made into an electric potential, it is good also as a structure which makes the electric potential of the ground grid 3, the reference electrodes 6a-6c, and the grid electrode 5 an electric potential which has an electric potential difference in the positive side in order toward the downstream of the airflow direction G. If comprised in this way, the electric field which draws a positive ion against an air flow upstream will arise, and these positive ions and a cluster will be collected by the water film on the collection parts 2 and 3 provided in the flow path. Is done.

  In the gas reforming apparatus 21 of the second embodiment, the grid electrode 5 is disposed downstream of the electrode set 4c. However, the ground grid 3 may be disposed instead of the grid electrode 5. Thereby, ions and clusters are also collected in the ground grid 3 on the downstream side.

  In the above embodiment, the gas reformers 1, 21, 31, and 41 are applied to the treatment of air such as sewage treatment plants. However, the gas reformers 1, 21, 31, and 41 are also used for treatment of exhaust gas discharged from various factories and the like and treatment of other gases. The present invention is applicable, and may be applied to air cleaning in a clean room or the like.

In addition, the gas reforming apparatus 1, 21, 31, 41 of the above-described embodiment collects bacteria in the gas by attaching them to the cluster and collects bacteria in the gas by negative ions such as O ⁻ , ozone, and OH radicals. Can be applied to gas sterilization and sterilization, and may be applied to hospitals, general households, refrigerators, and the like.

  Moreover, in the said embodiment, although the reference electrode 6 and the excitation electrode 7 were arrange | positioned in a line along the cross section of the duct 2, you may change a position with respect to the flow direction G of air, and the point is a reference electrode. 6. The plasma is generated between the excitation electrodes 7 and the reference electrode 6 and the excitation electrode 7 may be arranged so that the plasma is exposed to the air in the duct 2.

  In the above embodiment, a photocatalyst coating capable of forming a water film is applied to the collection parts 2 and 3 when irradiated with ultraviolet rays to form a water film. However, a large amount of water vapor is contained in the processing gas. If it is contained in the photocatalyst coating, the photocatalytic coating may not be applied. Moreover, it is good also as a structure which forms a water film by cooling the duct 2 inner wall and the grounding grid 3 below a dew point.

  In addition, the grid electrodes 3 and 5 of the said embodiment shall contain a metal-mesh and a perforated plate.

  Moreover, when it is set as the structure which arrange | positions a catalyst in the back | latter stage of the gas reforming apparatus of the said embodiment, since the moisture which is collected by the collection parts 2 and 3 and the gas which flows through the duct 2 is dehumidified, a catalyst There is also an advantage that the dry state of the catalyst is maintained and the catalyst life is extended.

  Moreover, in the gas reforming apparatus of the said embodiment, although the collection part is made into the structure which makes the inner wall of the duct 2 and the grounding grid 3, the structure which makes only the inner wall of the duct 2 the collection part, or the duct 2 is not made into a conductor. Moreover, it is good also as a structure which uses only the grounding grid 3 as a collection part.

It is a schematic block diagram which shows the gas reforming apparatus which concerns on 1st Embodiment of this invention. It is a diagram which shows the electric potential in each electrode in FIG. 1, and is a thing at the time of setting a power supply as a high frequency power supply. It is a diagram which shows the electric potential in each electrode in FIG. 1, and is a thing at the time of setting a power supply as a pulse power supply. It is a schematic block diagram which shows the gas reforming apparatus which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows the gas reforming apparatus which concerns on 3rd Embodiment of this invention. It is a schematic block diagram which shows the gas reforming apparatus which concerns on 4th Embodiment of this invention.

Explanation of symbols

  1, 2, 31, 41 ... Gas reforming device, 2 ... Duct (flow path; collection part), 3 ... Grounding grid (collection part), 4, 4a to 4c ... Electrode set (electrode pair), 5 ... Grid electrode, 6 ... reference electrode, 10 ... drain.

Claims (8)

A flow path through which a gas containing water molecules flows;
In the flow path, a pulse voltage or an alternating voltage is applied to generate a plasma, and an electrode pair arranged to expose the plasma to the gas;
A collector having a grounded conductor provided in the flow path, and
A gas reforming apparatus, wherein a direct current bias is applied to the electrode pair, wherein one electrode of the electrode pair is a reference electrode, and a potential of the reference electrode is a positive potential or a negative potential.   The gas reforming apparatus according to claim 1, wherein the collection unit is an inner wall of the flow path.   3. The gas reforming apparatus according to claim 1, wherein the collection unit includes a grounding grid disposed upstream of the electrode pair. A grid electrode disposed on the downstream side of the reference electrode and applied with a DC voltage;
When the potential of the reference electrode is a positive potential,
The potential of the grid electrode is a potential having a potential difference on the positive side from the potential of the reference electrode,
When the reference electrode has a negative potential,
The gas reforming apparatus according to any one of claims 1 to 3, wherein the potential of the grid electrode is set to a potential having a negative potential difference from the potential of the reference electrode.   The gas reformer according to any one of claims 1 to 3, wherein the collection part has a grounding grid arranged on the downstream side of the electrode pair. A plurality of the electrode pairs are juxtaposed in the gas flow direction,
When the potential of the reference electrode is a positive potential,
The potential of the reference electrode is a potential having a potential difference on the positive side in order in the gas flow direction,
When the reference electrode has a negative potential,
6. The gas reforming apparatus according to claim 1, wherein the potential of the reference electrode is set to a potential having a potential difference on the negative side in order in the flow direction of the gas.   The gas reformer according to any one of claims 1 to 6, wherein the collection unit is coated with a photocatalytic coating capable of forming a water film when irradiated with ultraviolet rays.   The gas reforming apparatus according to any one of claims 1 to 7, wherein the flow path is provided with a drain port through which water in the flow path can be discharged.

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