JP4901849B2 - Air purifier, analysis room, and air purification method - Google Patents

Description

  The present invention relates to an air purifier, and in particular, an air purifier that removes mercury contained in ambient air and purifies it, an analysis chamber equipped with the air purifier, and an air purifier that uses the air purifier. It relates to a purification method.

  In recent years, in the United States and the EU, in addition to NOx and SOx contained in flue gas emitted from power plants, various factories, automobiles, etc., health damage due to the discharge of various trace components such as Hg, Pb, and F has been prevented. There is a growing interest in regulating emissions at very low levels.

  Among these various trace components, metallic mercury is particularly likely to be released into the atmosphere because of its high vapor pressure even at room temperature. For example, most of the mercury discharged from a coal fired boiler through a chimney is released into the atmosphere in the form of the above metal mercury, then moves to the lake and the sea with rainfall and changes from inorganic mercury to organic mercury. It is taken in mainly and affects human health. Since mercury has a serious impact on humanity in this way, attempts have been made to reduce emissions in various directions, and various reduction methods have already been proposed.

As a typical example, Patent Document 1 discloses that metal mercury is efficiently activated by irradiating exhaust gas with ultraviolet light having a wavelength of 254 nm or less from a light source provided in the upstream of a coal dust boiler dust collector or desulfurization apparatus. There is disclosed a technique for obtaining a high mercury removal efficiency by using a low vapor pressure compound and passing it through a heat exchanger or a separate trap.
JP 2007-181757 A

  The technique disclosed in Patent Document 1 has high processing efficiency and is suitable for application to removing mercury from exhaust gas discharged from a large apparatus such as a boiler of a thermal power generation facility. However, for example, it is difficult to apply to the purification of polluted air containing mercury at a high concentration, such as ambient air when a fluorescent lamp or mercury thermometer is damaged, or ambient air of a coal combustion facility. For example, in a low-concentration mercury analysis chamber, it is necessary to maintain the mercury concentration in the indoor atmosphere at a low level in order to avoid contamination by mercury in the air, but it is difficult to apply to such applications.

  The problem to be solved by the present invention is to solve the above-mentioned problems of the prior art, and to circulate the air and repeat the purification process to reliably purify even when the mercury concentration in the polluted air is high or in the indoor atmosphere. An object is to provide an air cleaner capable of maintaining the mercury concentration at a low level, an analysis chamber equipped with the air cleaner, and a method for purifying air using the air cleaner.

  The above problem is that a fan for sucking air containing mercury vapor to be processed into the apparatus, and light having a wavelength of 254 nm is irradiated to the air sucked by the fan, and mercury oxide is generated from the mercury vapor. This is solved by an air purifier having an irradiating means that is disposed on a wall surface surrounding the irradiation space of the irradiating means, and an adsorbing means that adsorbs the mercury oxide and purifies the air.

By operation of the fan, air containing mercury vapor to be processed is sucked into the apparatus. The mercury vapor contained in the sucked air is irradiated with light having a wavelength of about 254 nm emitted from the excited mercury element by the irradiation means. Then, the irradiated mercury element is activated, reacts quickly with oxygen in the air, and becomes a mercury oxide (HgO) having a low vapor pressure of 10 ⁻¹⁶ atm (10 ⁻¹⁰ ppm). Thus, mercury oxide can be adsorbed and recovered by providing adsorption means such as activated carbon or silica on the wall surface surrounding the irradiation space of the irradiation means. As a result, it is possible to purify air containing mercury vapor.

  In this way, an air flow is generated by using a fan, and by this flow, mercury vapor is taken in from the outside of the device, irradiation with light having a wavelength of 254 nm, adsorption recovery in the form of mercury oxide, and purified air device. The four steps of discharging to the outside can be performed smoothly and continuously. As a result, not only these four steps are executed once, but also after the purification process exhausted outside the apparatus in the final process is taken into the apparatus again, and the purification process is performed again from the first process. The purification process can be repeated a plurality of times by circulating the gas.

  As a result, by installing this air purifier in a space such as a room, mercury can be removed while circulating the air inside the room. Therefore, the present invention can be applied to purify air that has been contaminated at a high concentration, such as ambient air when a fluorescent lamp or mercury thermometer is damaged, or ambient air of a coal combustion facility. In addition, if an analysis room with this air purifier is installed, the mercury concentration in the room atmosphere can be maintained at a low level, so analysis of mercury-containing gas and mercury-contaminated air can be performed in a clean atmosphere free of contaminants. It can be performed with high accuracy.

  The mercury concentration of the air to be treated is desirably 20 ng / liter or more and 1000 ng / liter or less, for example.

  For example, metallic mercury has a vapor pressure of about 1 to several ppm at room temperature. If a fluorescent lamp, mercury thermometer, etc. scatters due to breakage, the nearby air contains mercury vapor at a high concentration. ing. Moreover, several to several + ppb mercury vapor is contained in the flue gas from the coal combustion facility. Due to this influence, the air itself around the combustion facility is contaminated with mercury vapor at a high concentration.

  As described above, the purification process is repeated while circulating the air to be treated, and mercury removal is performed to purify contaminated air around the damaged fluorescent lamp / mercury thermometer. It is particularly effective for consumer air purification applications. It is also effective in purifying the ambient air of coal combustion equipment, which has a high mercury concentration. Furthermore, it is also effective for applications such as air purification in a low-concentration mercury analysis chamber, where it is necessary to maintain the mercury concentration in the atmosphere at a low level in order to avoid contamination with mercury in the air.

  The concentration of mercury in the air that can be processed is not limited, but if the concentration is too high, purification takes time. If the mercury concentration is, for example, 1000 ng / liter or less, the purification treatment can be reliably performed in a short time. Further, if the mercury concentration is less than 20 ng / liter, for example, the existing air purification technology can be used to some extent. Therefore, when the mercury concentration is, for example, 20 ng / liter or more and 1000 ng / liter or less, the circulating purification treatment as described above exhibits a particularly remarkable effect.

  In addition, a housing that forms the outer shell of the apparatus, an intake port that is provided in the housing and takes in air to be processed into the apparatus, and an exhaust port that is provided in the casing and discharges purified air to the outside of the apparatus. It is desirable that the air discharged from the discharge port can be retaken from the intake port.

  By making it possible to take in the air discharged from the outlet of the housing again from the inlet, there are four processes, such as “uptake, irradiation, adsorption recovery, discharge” and then “uptake, irradiation,... It is possible to purify high-level mercury vapor by repeatedly repeating the above as one loop repeatedly.

  In addition, the air intake direction from the intake port, the air discharge direction from the exhaust port, and the mutual relationship between the intake port and the exhaust port can be re-intaken from the intake port. It is desirable to set so that

  Thereby, along with the air flow generated by the fan, the air discharged from the discharge port can be reliably taken in from the intake port and circulated for digestion.

  In addition, the intake port is arranged on the side of the housing and is configured to take in the air to be processed from the outside of the apparatus substantially horizontally. The exhaust port is disposed on the upper portion of the housing and purified. The casing is configured to discharge substantially upward air, and the housing is configured to turn down the air horizontally taken in from the intake port and guide it downward, and the air guided downward by the descending passage It is desirable to include a reversing channel that reverses the air and an ascending channel that guides the air reversed in the reversing channel and supplies the air to the discharge port.

  In this way, by adopting a flow path structure that takes in horizontally → turns and turns downward → U-turns at the bottom → guides upward and discharges, it goes straight from the intake to the discharged after processing (for example, in the horizontal direction all the time) The overall size of the apparatus can be reduced as compared with the case where the flow path structure is guided.

  Further, the fan may be disposed in the reversing flow path so as to generate an air flow that is taken in from the intake opening and discharged from the discharge opening through the descending flow path, the reversing flow path, and the rising flow path. desirable.

  In the flow path structure of horizontally taking in, turning and turning downward, U-turn upward in the lower part, leading upward, and discharging, by arranging a fan in the lowermost reverse flow path, the air flow flowing in the above order can be obtained. It can occur smoothly and air can be circulated reliably.

  Further, the irradiating means is provided in the ascending channel, and it is desirable to irradiate the light rising at the ascending channel with light having a wavelength of 254 nm.

  As a result, in the flow of horizontally taking in, turning and turning down → U-turn upward at the lower part (while applying driving force by the fan) → leading upward and discharging, oxidation by irradiation on the downstream side of the fan It is possible to reliably generate mercury and to reduce the size of the apparatus.

  The adsorbing means preferably includes a first adsorbent layer provided in the ascending flow path and a second adsorbent layer provided in the discharge port.

  By performing adsorption recovery of mercury oxide in a two-stage manner with respect to the rising flow containing mercury oxide generated by irradiation, purification treatment can be performed reliably.

  The irradiation means is preferably a low pressure mercury lamp.

  A high emission light source such as a high-pressure mercury lamp can provide a high-power light source, but it has low absorption efficiency and is prone to other reactions such as generation of ozone, which may make it difficult to improve processing efficiency. . In the ninth invention of the present application, by using a low-pressure mercury lamp as the irradiating means, the above-described adverse effects can be avoided and high processing efficiency can be reliably obtained.

  The above-described problem is also for analyzing a gas to be processed, and a fan for sucking air containing mercury vapor into the apparatus, and irradiating light having a wavelength of 254 nm to the air sucked by the fan. An air cleaner having irradiation means for generating mercury oxide from the mercury vapor, and an adsorption means disposed on a wall surface surrounding the irradiation space of the irradiation means and adsorbing the mercury oxide to purify the air, The problem can also be solved by an analysis chamber arranged in the internal space.

  The above-mentioned problem is also that a fan for sucking air containing mercury vapor to be processed into the apparatus, and light having a wavelength of 254 nm are irradiated to the air sucked by the fan, and mercury oxide is emitted from the mercury vapor. An air purifier that is disposed on a wall surface that surrounds the irradiation space of the irradiation unit and that has an adsorption unit that adsorbs the mercury oxide and purifies the air, and is purified by the adsorption unit and the air The problem can also be solved by an air purification method for purifying air existing in a predetermined room by circulating the air discharged from the cleaner so as to be taken into the air cleaner again.

  According to the present invention, air contaminated with Hg vapor can be efficiently purified by circulating air and repeating the purification process. As a result, air purification can be reliably performed even when contamination with a high mercury concentration such as fluorescent lamp breakage or mercury thermometer breakage, which can occur in general households.

  In addition, in the analysis of mercury in gas, a room with a low mercury concentration in the air is required to prevent contamination in the sample. According to the present invention, the mercury concentration in the indoor atmosphere can be maintained at a low level, and an analysis chamber suitable for the analysis described above can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an external appearance of an air cleaner according to an embodiment of the present invention, and FIG. 2 is a side sectional view showing an internal structure of the air cleaner shown in FIG.

  1 and 2, the air cleaner 1 according to the present embodiment has a substantially rectangular parallelepiped appearance as a whole, and has a housing 2 that constitutes the outer shell of the apparatus.

  The housing 2 is provided with an air intake port 3 on the front surface that sucks the air AR containing mercury vapor to be processed substantially horizontally and takes it into the apparatus, and guides the purified air AR upward substantially outside the apparatus. An air discharge port 4 for discharging is provided at the top. An operation unit 5 having various switches and lamps for operation by an operator is provided below the air intake 3 of the housing 2, and a dust removal filter is provided in the air intake 3. 6 is provided.

  In addition, a partition wall 7 that partitions the air intake port 3 side and the air exhaust port 4 side is provided inside the housing 2, and a control device storage unit 8 is provided at the bottom. As a result, an introduction passage 9 (downflow passage), an intermediate passage 10 (reversal passage), and an irradiation chamber 11 (upflow passage) are formed in the housing 2.

  The introduction passage 9 turns the air AR taken horizontally from the air intake port 3 downward and then guides it downward (see the arrow in the figure, the same applies hereinafter).

  The intermediate passage 10 is located at the upper part of the control device storage unit 8 and inverts the air AR descending the introduction passage 9 to make a U-turn sideways and further upward. A fan device 12 is provided in the intermediate passage 10. Due to the driving force of the fan device 12, a flow of the air AR taken from the air intake port 3 and discharged from the air discharge port 4 through the introduction passage 9, the intermediate passage 10, and the irradiation chamber 11 is generated.

  The irradiation chamber 11 guides the air AR inverted upward as described above and supplies the air AR 4 with the air AR. A plurality (two in the illustrated example) of light sources 13 (irradiation means) are provided inside the irradiation chamber 11.

  The light source 13 emits light containing a component having a wavelength of 254 nm and irradiates the air AR rising in the irradiation chamber 11. For example, a mercury lamp equipped with a mercury discharge tube used for sterilization purposes is used. Can be used. Some mercury lamps have an emission spectrum including a wavelength of 254 nm or less, and these can also be used. However, it is preferable to use a wavelength of 254 nm from the viewpoint of reducing the absorption of other components and the efficiency of the light emission-absorption characteristic of mercury. Further, as the light source 13, a light source that does not use light emission of mercury atoms, for example, a KrF laser (mainly emitting light with a wavelength of 248 nm) or an ArF laser (mainly emitting light with a wavelength of 193 nm) can be used.

  A first adsorbent layer 14 (which constitutes a part of the adsorbing means) is provided on the wall surface of the irradiation chamber 11, in other words, the wall surface surrounding the irradiation space of the light source 13. The first adsorbent layer 14 is provided with an adsorbent such as activated carbon or silica gel.

  The air exhaust port 4 is provided with a second adsorbent layer 15 (which constitutes a part of the adsorbing means). The second adsorbent layer 15 is composed of a net, a nonwoven fabric, a honeycomb structure or the like containing an appropriate adsorbent.

  In the air purifier 1 configured as described above, the air AR containing the vapor mercury to be processed is passed from the air intake 3 through the introduction passage 9 and the intermediate passage 10 by the driving force of the fan device 12, and the irradiation chamber 11. In the irradiation chamber 11, light including a wavelength component of 254 nm is irradiated from the light source 13.

Here, in general, a mercury lamp excites Hg atoms by being discharged in mercury vapor, and utilizes light emission when it transitions to a low energy state. In the air cleaner 1 of the present embodiment, a phenomenon opposite to that in the case of the light emission occurs by irradiating mercury molecules in the air AR from the light source 13 with light having a wavelength of 254 nm equivalent to that emitted from the mercury lamp, Hg atoms absorb light and are excited. Hg atoms excited by irradiation with light of 254 nm are in a highly reactive state and react with O ₂ existing in a large amount in the irradiation chamber 11 to form stable HgO (mercury oxide). Since the vapor pressure of HgO is as low as 10 ⁻¹⁶ atm (10 ⁻¹⁰ ppm), the first adsorbent layer 14 provided in the irradiation chamber 11 and the second adsorbent layer 15 provided in the air outlet 4 on the downstream side thereof. Adsorbed and recovered. Thereby, only mercury can be efficiently removed and purified from the air AR to be processed.

  In the air cleaner 1, the air flow is generated using the fan device 12 as described above, and by this flow, mercury vapor is taken in from the outside of the device, light is irradiated at a wavelength of 254 nm, and mercury oxide is used. The four steps of adsorbing and collecting the air and discharging the purified air AR to the outside of the apparatus can be executed smoothly and continuously. As a result, not only these four steps are executed once, but also after the purification process AR discharged from the air outlet 4 in the final step to the outside of the apparatus as shown in FIG. The air is circulated and the purification process is repeated a plurality of times by taking the air AR 3 into the apparatus and repeating the purification process from the first step (intake → irradiation → adsorption / recovery → discharge → reincorporation → irradiation → adsorption / recovery → discharge → can capture again ...). Therefore, by installing the air cleaner 1 in a room or the like, mercury in the air AR can be removed from the surrounding area (or the entire interior of the room) EA while circulating the air AR inside the room. .

  Further, in the air cleaner 1, as shown in FIG. 2, the air is taken in from the air intake port 3 → turned and the introduction passage 9 is moved downward → the lower intermediate passage 10 is moved upward U-turn → the irradiation chamber. The flow path structure is such that 11 is guided upward and discharged from the air discharge port 4. As a result, the overall size of the apparatus can be reduced as compared with a flow path structure that leads in a straight line (for example, in a horizontal direction) from taking in to discharging after processing. At this time, by disposing the fan device 12 in the lowermost intermediate passage 10, the air flow flowing in the above order can be generated smoothly, and the air AR can be circulated reliably.

  Further, in the air cleaner 1, the first adsorbent layer 14 and the second adsorbent layer 15 against the rising flow of the air AR in the irradiation chamber 11 containing mercury oxide generated by the irradiation of light from the light source 13. The mercury oxide is adsorbed and recovered in two stages. Thereby, a purification process can be performed reliably.

Hereinafter, embodiments of the present invention will be described in detail using specific examples.
[Example 1]
FIG. 4 is a side sectional view showing the internal structure of the air cleaner 1 according to this embodiment, and corresponds to FIG.

4, in this embodiment, the air purifier includes a housing 2 having a width W = 600 [mm] (see FIG. 1, the same applies hereinafter), a height H = 700 [mm], and a depth D = 250 [mm]. Machine 1 was used. In this air cleaner 1, a polyethylene non-woven fabric was used as the dust removing filter 6, and an air suction horizontally long sirocco fan (air flow rate 7 m ³ / min) was installed as the fan device 12.

  As the light source 13, four germicidal lamps (low pressure mercury lamps) rated at 10 [W] were installed. The adsorbent used for the first adsorbent layer 14 was a paste in which activated carbon powder and silica sol were kneaded in a mortar. This adsorbent is applied so as to block a large number of through holes provided in a 0.7-t SUS430 metal lath and dried in an atmosphere of 140 ° C. to form an adsorbent plate. Layer 14 was constructed. Then, the first adsorbent layer 14 was disposed in the irradiation chamber 11 so as to face each other while sandwiching the four light sources 13. The height dimension Ha of the first adsorbent layer 14 at this time was Ha = 450 [mm], and the gap dimension Xa between the two first adsorbent layers 14 and 14 was set to 53 [mm]. In the present embodiment, the second adsorbent layer 15 described above was not provided.

The air cleaner 1 of the present example was brought into a room contaminated with scattered mercury particles and operated, and purification was performed while circulating the air AR as described above. At this time, the mercury concentration of the air AR at the air inlet 3 and the air outlet 4 is analyzed by a method based on JIS K-0222 (after the air AR is absorbed in the sulfuric acid permanganate potassium solution, The mercury reduction rate was determined by analyzing with an atomic absorption device manufactured by Japan Instruments.
[Comparative Example]
Using the same apparatus as in Example 1, the same test was performed without turning on the germicidal lamp as the light source 13.

  The results obtained in Examples and Comparative Examples are shown in Table 1.

  As is clear from Table 1, the mercury in the air AR is collected in the form of HgO by irradiation with light of 254 nm emitted from a mercury lamp, and the process is repeated by circulating the air AR, so that in this embodiment, the final process is performed. It can be seen that mercury is no longer detected in the air from the air outlet 4 and the air AR in the room can be reliably purified.

In particular, in this embodiment, a low-pressure mercury lamp is used as the light source 13. For example, a light source with a wide emission spectrum, such as a high-pressure mercury lamp, can obtain a high-output light source, but has low absorption efficiency and is prone to other reactions such as the generation of ozone. There is. In the present embodiment, by using a low-pressure mercury lamp as the light source 13, the above-described adverse effects can be avoided and high processing efficiency can be reliably obtained.
[Example 2]
FIG. 5A is a diagram showing an embodiment in which the present invention is applied to air purification when a fluorescent lamp is broken and scattered in a room. FIG. 5B similarly shows a mercury thermometer in a room. It is a figure which shows the Example at the time of applying this invention to the air purification | cleaning when scattered by damage.

  In general, metallic mercury has a vapor pressure of about 1 to several ppm at room temperature. For this reason, as shown in FIGS. 5A and 5B, when the fluorescent lamp 51, the mercury thermometer 52, etc. are scattered due to damage, the air in the vicinity contains mercury vapor at a high concentration. Yes.

As described above, the air cleaner 1 can remove mercury while circulating air. Therefore, as shown in FIG. 5A, mercury is removed from the air AR1 in the surrounding area EA1 when the fluorescent lamp 51 is broken, and the air AR2 in the surrounding area EA2 when the mercury thermometer 52 is broken shown in FIG. It is particularly effective for consumer air purification that has a high mercury concentration even in small amounts.
Example 3
FIG. 6 is a diagram showing an example in which the present invention is applied to a low concentration mercury analysis chamber for analyzing mercury concentration. In the internal space EA3 of the analysis chamber 60, a mercury analyzer 61 and the air cleaner 1 are provided.

  The mercury analyzer 61 is known as this type, and the sample gas (mercury-containing gas, mercury-contaminated air, etc.) is sucked into the apparatus from the suction port 62, whereby the mercury concentration in the sample gas is determined. It is to detect. Therefore, in order to perform this detection with high accuracy, the ambient atmosphere must be kept clean.

  As described above, the air purifier 1 can perform mercury removal by repeating the process of exciting Hg atoms in the air by irradiation and adsorbing them as HgO while circulating air. Therefore, as shown in FIG. 6, the mercury cleaner in the internal space EA3 is maintained at a low level by providing the air cleaner 1 in the analysis chamber 60 and circulating and purifying the air AR3 in the internal space EA3. be able to. As a result, analysis of mercury-containing gas and mercury-contaminated air can be performed accurately in a clean atmosphere free from contaminants.

It is a perspective view showing the appearance of the air cleaner concerning an embodiment of the invention. It is a sectional side view showing the internal structure of the air cleaner concerning an embodiment of the invention. It is explanatory drawing showing the behavior of the air circulation by the air cleaner which concerns on embodiment of this invention. It is a sectional side view showing the internal structure of the specific Example of an air cleaner. It is explanatory drawing which shows the Example at the time of applying this invention to the air purification | cleaning when a fluorescent lamp and a mercury thermometer are scattered and broken indoors. It is explanatory drawing which shows the Example at the time of applying this invention to the low concentration mercury analysis room for analyzing mercury concentration.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Case 3 Air intake (intake)
4 Air outlet (exhaust port)
9 Introduction passage (downward flow path)
10 Intermediate passage (reverse flow path)
11 Irradiation chamber (ascending channel)
12 Fan device (fan)
13 Light source (irradiation means)
14 First adsorbent layer (adsorption means)
15 Second adsorbent layer (adsorption means)
60 Analysis room AR Air AR1-3 Air

Claims (10)

A fan for sucking air containing mercury vapor into the equipment to be treated;
Irradiation means for irradiating the air sucked by the fan with light having a wavelength of 254 nm and generating mercury oxide from the mercury vapor;
An air cleaner, comprising: an adsorbing unit disposed on a wall surface surrounding an irradiation space of the irradiation unit and configured to adsorb the mercury oxide and purify the air. In the air cleaner according to claim 1,
A housing constituting the outer shell of the device;
An intake port that is provided in the housing and takes in the air to be processed into the apparatus;
A discharge port that is provided in the housing and discharges the purified air to the outside of the device;
An air purifier configured to be able to retake air discharged from the discharge port from the intake port. The air cleaner according to claim 2,
The intake direction of the air by the intake port, the discharge direction of the air by the discharge port, and the mutual positional relationship of the intake port and the discharge port are expressed as follows. An air purifier characterized in that it is set so that it can be retaken from the slot. In the air cleaner according to claim 3,
The intake is
It is arranged on the side of the case and is configured to take in the air to be processed from the outside of the apparatus substantially horizontally
The outlet is
It is arranged at the upper part of the housing, and is configured to discharge the air after purification substantially upward,
The housing is
A downward flow path that turns the air taken horizontally from the intake port and guides it downward,
An inversion channel for inverting the air guided downward by the descending channel;
An air cleaner comprising: an ascending flow path that guides the air reversed in the reversing flow path upward and supplies the air to the discharge port. In the air cleaner according to claim 4,
The fan is
Arranged in the reversing flow path so as to generate a flow of air that is taken in from the intake opening and discharged from the discharge opening through the descending flow path, the reversing flow path, and the ascending flow path. An air purifier characterized by. In the air cleaner according to claim 4 or 5,
The irradiation means includes
An air cleaner that is provided in the ascending flow path and irradiates light rising at the rising flow path with light having a wavelength of 254 nm. The air cleaner according to any one of claims 4 to 6,
The adsorption means includes
A first adsorbent layer provided in the ascending flow path;
An air cleaner comprising: a second adsorbent layer provided at the discharge port. In the air cleaner in any one of Claims 1 thru | or 7,
The air cleaner is a low-pressure mercury lamp. An analysis chamber for analyzing a gas to be processed,
A fan for sucking air containing mercury vapor into the apparatus, irradiation means for irradiating light having a wavelength of 254 nm to the air sucked by the fan, and generating mercury oxide from the mercury vapor; and An analysis chamber, wherein an air purifier disposed on a wall surface surrounding an irradiation space and having an adsorption means for adsorbing the mercury oxide and purifying the air is disposed in the internal space. A fan for sucking air containing mercury vapor into the apparatus to be treated; and irradiation means for irradiating the air sucked by the fan with light having a wavelength of 254 nm and generating mercury oxide from the mercury vapor Using an air cleaner that is disposed on a wall surface that surrounds the irradiation space of the irradiation means and has an adsorption means that adsorbs the mercury oxide and purifies the air,
By circulating the air purified by the adsorbing means and discharged from the air cleaner so as to be taken into the air cleaner again,
An air purification method comprising purifying air existing in a predetermined room.

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