JP2005034708A - Treatment/removal device for carbon monoxide and others - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for treating/cleaning a gas containing carbon monoxide and other harmful gases released to a narrow space and a space with insufficient ventilation. <P>SOLUTION: The device controls an oxidation catalyst 4 so as to uniformly warm the oxidation catalyst 4 to an appropriate temperature or previously heat it in order to activate a catalytic reaction and discharges an external gas after the external gas is circulated and oxidized by passing it through the oxidation catalyst layer 4. In the device, a carbon monoxide concentration sensor 9 is arranged near a gas discharge port 3 and characteristics of the device are monitored. A carbon monoxide sensor 10 is arranged near an external air flowing-in port 2 and the treatment device is automatically/manually operated when the concentration of carbon monoxide exceeds a reference value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a carbon monoxide or other processing apparatus that is generated or diffuses in the air during metal welding, refining, iron making, coal distillation, smoking, or the like.
[0002]
[Prior art]
Dust masks are used for fume and gas generated during metal welding, particularly carbon dioxide arc welding, from the viewpoint of maintaining the health of the welding operator.
Conventionally, of the fumes and gases generated in the welding operation, the fumes are removed through a collecting device, and the treated gas is discharged into the room. There was little concern about the amount of carbon monoxide (gas, hereinafter the same) contained in the released gas, and toxicity.
However, the result of the measurement showed that carbon monoxide was generated in excess of the amount conventionally considered.
As a result, it has become clear that there is a risk of environmental pollution for third parties working in the room.
[0003]
Since carbon monoxide is tasteless and odorless, and its ability to bind hemoglobin in the blood is several hundred times stronger than that of oxygen, it is not equipped with a warning device or ventilation means for carbon monoxide, such as a narrow space, such as a tank It is also known that when carbon monoxide arc welding increases the concentration of air monoxide in the air, workers may suffer from carbon monoxide poisoning, such as headaches and dizziness, or even death. Yes.
[0004]
Conventionally, life masks equipped with an oxidation catalyst have been used in mine work for the purpose of preventing workers' accidents due to an increase in the concentration of carbon monoxide.
In fire fighting activities, a protective mask equipped with an oxidation catalyst has been used from the viewpoint of preventing a carbon monoxide suction accident by a fireman at the fire site.
The air purifier placed in the smoking room is equipped with a filter for removing coal dust and tar mist, but there is no specific processing method for carbon monoxide generated from incomplete combustion of tobacco. Therefore, smoking in a closed space may adversely affect not only smokers but also the surrounding people.
[0005]
In an ironworks, iron ore, sintered ore, coke, limestone, etc. are carried into a blast furnace and hot air is blown to obtain pig iron to generate a large amount of carbon monoxide.
A control room, a worker stuffing station, and the like related to this process are arranged in the vicinity of the blast furnace, and there is a possibility that workers may be exposed to carbon monoxide in the case of gas leakage.
For this reason, in control rooms, etc., a sensor that issues an alarm when the gas concentration in the room is measured and exceeds the reference value is installed, and various protections and measures are taken for the purpose of ensuring the safety of workers working in the room and evacuation guidance. Evacuation equipment is arranged.
[0006]
In addition, in order to use the carbon monoxide as a fuel gas at steelworks, there are places where the gas pipes are installed around the work room or the like in the plant, but gas leaks from the pipes or joints thereof. In the event that it occurs, there is also a place where an alarm device is installed by detection of a carbon monoxide concentration sensor.
[0007]
[Problems to be solved by the invention]
The present invention heats the catalyst in an oxidation catalyst in order to activate a catalytic reaction for oxidizing carbon monoxide in an apparatus for treating and detoxifying carbon monoxide diffused or contained in air (environment). A means is attached to control the catalyst to maintain an appropriate temperature at which the oxidation efficiency of the catalyst is improved, and the concentration of carbon monoxide contained in the indoor air using a carbon monoxide concentration sensor is a reference value (for example, 70 ppm). When it is detected that the gas was exceeded, the gas carrier device such as a blower, a compressor or a pump is automatically or manually operated, and the gas is treated, sent into the removal device, or sucked to be purified. Provided is an apparatus for maintaining environmental sanitation by exhausting / releasing only gas to a space (environment).
[0008]
Furthermore, by inserting a carbon monoxide concentration sensor into the exhaust path after processing and checking the concentration of carbon monoxide contained in the released (exhaust) gas, the function of the device is monitored to detect failures. In addition, the objective is to eliminate the problem of improving the work environment by maintaining the carbon monoxide concentration of the gas after treatment at a desired level or less, thoroughly managing the health of employees working in the same environment.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following constituent elements.
(1) In an apparatus for circulating and treating a gas containing a harmful gas such as carbon monoxide through an oxidation catalyst layer, a means for heating the catalyst layer as uniformly as possible is attached, and the heating source is controlled to provide a catalyst. An apparatus for treating and removing carbon monoxide and the like, wherein one or more temperature sensors that operate to maintain the temperature of the layer at an appropriate temperature are arranged in a container that contains the oxidation catalyst.
[0010]
(2) Gas is used to prevent the oxidation catalyst layer from being heated locally, and a heat transfer fin connected to the heat source and having a heat diffusion / conduction area between the heat source and the catalyst layer increased as much as possible. The carbon monoxide and other treatment and removal apparatus described in the above item (1), which is embedded in a container along the flow direction.
(3) Between the gas inlet side in the container and the front surface of the oxidation catalyst layer, a mesh capacity, a granular material layer, etc. made of a good heat conductor having a heating source that disturbs the flow of the inflowing gas is interposed. A carbon monoxide or other treatment / removal apparatus as described in (1) above.
[0011]
(4) The above (1), wherein a gap is provided on either or both of the gas inlet side and the gas outlet side across the oxidation catalyst layer, and the gas is circulated through the gap. ) To (3), any one of the carbon monoxide and other treatment and removal apparatuses.
(5) Install a carbon monoxide concentration sensor on the gas outlet side or in front of it, measure the carbon monoxide concentration of the treatment gas, and detect that the concentration exceeds a predetermined value. The carbon monoxide or other treatment / removal device according to any one of the above items (1) to (4), wherein the device emits a signal.
[0012]
(6) When the carbon monoxide concentration in the outside air is measured and it is detected that the concentration exceeds a predetermined value, the gas containing carbon monoxide is sent to the gas inlet side or discharged to the outlet side through the device. A gas feeding device such as a blower, a compressor or a pump is operated, and the carbon monoxide or other treatment or removal device according to any one of the above (1) to (5), .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A heating means for heating the oxidation catalyst layer as uniformly as possible to an appropriate temperature is provided, and a temperature sensor for controlling a heating source is disposed at a predetermined position of the catalyst layer to control the temperature of the oxidation catalyst.
Alternatively, a metal mesh capacity made of a good heat conductor, a granular material layer, etc. are installed on the front side of the oxidation catalyst layer, a heating means is brought into contact with the mesh layer, the granular material layer, and a temperature sensor is arranged at an appropriate place, and the oxidation catalyst layer Is heated and controlled indirectly through a metal mesh capacity and granular layer.
[0014]
If necessary, a dust filter is provided upstream of the oxidation catalyst layer (between the outside air and the gas inlet of the apparatus).
[0015]
Place the device in operation and detect the purification rate of the processing gas by the carbon monoxide concentration sensor provided at the gas outlet. When the purification rate falls below the required value, a signal such as a display or alarm is issued. In addition, in preparation for a lack of capability, failure or failure of the device.
When the processing apparatus is placed in a preheating or operation preparation system and it is detected that the carbon monoxide content in the gas exceeds the reference value, the apparatus is operated manually or automatically.
[0016]
【Example】
(Part 1)
FIG. 1 shows a cross-sectional view of an embodiment of the apparatus of the present invention. The container 1 has openings at one end and the other end, respectively, and is provided with a gas inlet 2 and an outlet 3 communicating with the internal space. An oxidation catalyst 4, for example, a catalyst containing 20% copper oxide and 50% manganese monoxide as main components in the space in the container connecting the inlet 2 and the outlet 3 is generally called hopcalite (trade name). Fill with granular oxidation catalyst.
Further, a plurality of five heat sources (bar heaters) for heating the catalyst 4 are arranged and attached uniformly in the catalyst along the flow direction of the gas flowing through the oxidation catalyst layer 4.
[0017]
In addition, between the inflow port 2 and the front surface of the oxidation catalyst layer 4 and between the discharge port 3 and the rear surface of the oxidation catalyst layer 4 so that the gas flows uniformly in the oxidation catalyst layer 4 (acting the oxidation catalyst uniformly). It is desirable to provide an appropriate gap.
At that time, at least the front surface of the oxidation catalyst layer 4 is separated from the gap by the mesh plate.
Here, the upstream side is referred to as “front” along the gas flow during operation, and “rear” toward the downstream side.
[0018]
Since the reaction of the catalyst 4 is not activated unless the oxidation catalyst layer 4 is heated to an appropriate temperature, it is necessary to raise the temperature of the catalyst 4 to an appropriate value evenly during operation.
In this description, the temperature of the oxidation catalyst 4 when the catalytic reaction that promotes the oxidation of carbon monoxide is active and the temperature in the vicinity thereof (for example, 60 to 80 ° C.) are referred to as appropriate temperature (value).
Depending on the type of catalyst, there are some which affect the reaction efficiency due to the great influence of humidity. For example, in the case of hopcalite, if the catalyst is wet, the heat of vaporization is taken away by the flowing gas, and the temperature of the catalyst does not gradually rise to an appropriate temperature, so that the oxidation reaction is not activated during that time.
[0019]
Further, the heating temperature of the hopcalite (oxidation catalyst 4) has an upper limit (Max. 150 ° C.), and if the heating is excessive, the characteristics deteriorate and the catalyst life may be shortened. Therefore, in order to prevent the oxidation catalyst layer 4 from being locally heated to the deterioration temperature, the heat source 5 has a heat conductive surface formed of a good thermal conductor material, and a plurality of radial heat transfer fins 7 extending in the longitudinal direction are connected to the surface. And the heat conduction and heat diffusion area between the oxidation medium 4 and the catalyst layer 4 are heated as evenly as possible.
In FIG. 1, both outer edges of the heat transfer fins 7 are indicated by dotted lines parallel to the rod-like body heat source 5.
[0020]
T₁  , T₂  Is a temperature sensor installed in the oxidation catalyst layer 4 and arranged separately on the upstream side and the downstream side in the catalyst layer 4 along the gas flow direction.
The sensor must be appropriately separated from the rod-like body heat source 5 and the heat transfer fin 7 and detect the temperature of the oxidation catalyst layer 4 itself.
The temperature sensor T₁  , T₂  Activates the heat source 5 when it is detected that the temperature of the catalyst 4 has cooled below the appropriate value. Temperature sensor T₁  When detecting that the temperature of the catalyst layer 4 is close to an appropriate value, the temperature sensor T₂  When detecting that the temperature of the nearby catalyst layer 4 is close to the deterioration temperature, the heating means is turned off.
[0021]
The above-mentioned member is an indispensable requirement for preheating the oxidation catalyst layer 4 to an appropriate temperature by the heat source 5 to put the apparatus in a standby state or to put it in an operating state after a rise time. Sensor T₁  , T₂  In any case, when an appropriate temperature of the oxidation catalyst layer 4 is detected, it is displayed that the apparatus is ready for operation.
The temperature sensor T also works as a safety and protection device to prevent the oxidation catalyst from degrading and to prevent thermal runaway for the purpose of preventing accidents.₁  , T₂  Depends on the detection signal.
[0022]
Since the oxidation catalyst layer 4 has a heat capacity, even if the heat source 5 and the heat transfer fins 7 are used for heating, the entire temperature does not rapidly increase to an appropriate value (a large amount of heat is generated in a short time in an attempt to warm up rapidly). If supplied, the oxidation catalyst 4 may be deteriorated.)
When the oxidation catalyst 4 is moist, it does not rise to an appropriate temperature until the latent heat is taken away and it dries.
Until the temperature of the entire oxidation catalyst layer 4 uniformly rises to an appropriate value, even if the processing apparatus is forced to operate, the reaction of the entire catalyst is not effectively performed. Some time is required for the rise (for example, about 40 minutes, which varies depending on the season).
Therefore, when a gas such as carbon monoxide has to be processed quickly (reducing the rise time of the apparatus), it is necessary to preheat and keep the oxidation catalyst 4 close to an appropriate value.
[0023]
In that case, it is not necessary to operate the suction and exhaust devices such as a blower, a compressor or a pump, and the heat source 5 and the temperature sensor T₁  , T₂  In addition, the control means operates effectively to maintain the catalyst at the proper temperature.
When the oxidation catalyst 4 is preheated close to an appropriate temperature, it is effective to cover the outer peripheral wall, lid and bottom surface of the container 1 with a heat insulating material.
The lid has a structure that can be attached and removed in consideration of replacement and supplementation of the heat source 5 and the oxidation catalyst 4.
In addition, when the heat source 5 is inserted into the catalyst from the bottom of the container, the heat insulating material on the bottom surface may be attached and removed.
A double vacuum wall may be used instead of the heat insulating material.
[0024]
If the start-up time of the equipment can be reduced to zero, the equipment can always be put into an operation preparation system. For example, sudden carbon monoxide generation, automatic operation using a predetermined concentration output signal of the carbon monoxide concentration sensor, and simultaneous welding It is possible to expand the use mode such as gas treatment in progress.
[0025]
The purification rate of carbon monoxide contained in the gas is T₂  ≧ T₁  The temperature sensor T is improved when the condition is (appropriate temperature).₁  , T₂  In any case, when it is detected that the temperature of the catalyst layer 4 is close to the proper value or has reached the proper value, the standby (rise time) display is converted to the operation ready display as described above. Switch.
If the display does not switch to “ready for operation” even after the required time has elapsed, the heating means 5 or the temperature sensor T₁  , T₂  A failure of the control means is also conceivable.
[0026]
While the temperature of the apparatus cools the catalyst layer 4 while the apparatus is in operation, reaction heat is generated by the treatment. Therefore, the external heating of the catalyst layer 4 needs to consider the heat balance.
For example, the temperature gradient in the oxidation catalyst layer 4 in operation tends to have a generally low gas receiving temperature and a high gas discharging temperature (see FIG. 1).
In FIG. 1, along another heat source 5, a straight line indicated by a two-dot chain line is a model indicating a temperature gradient of the catalyst layer 4, and the level of temperature is indicated by a length (width) in the horizontal direction.
[0027]
When the catalyst reaction speed increases and the reaction heat warms the oxidation catalyst 4 above the appropriate temperature and approaches the deterioration temperature, the temperature sensor T₂  However, it is necessary to control so that the heat source 5 is turned off early and the temperature at which the catalyst 4 deteriorates is not exceeded.
[0028]
In order to circulate the outside air through the apparatus, either the air intake or exhaust part such as a blower, a compressor or a pump having the required characteristics is connected to either the gas inlet 2 or the outlet 3 of the apparatus so as to follow each function. Link.
[0029]
Now, when outside air containing harmful gases such as dust and carbon monoxide is circulated through the catalyst layer 4 through the gas inlet 2 through the oxidation catalyst 4 heated to an appropriate temperature, the entire area in the catalyst layer is oxidized by the oxidation of carbon monoxide. As a result of the reaction heat generated in the above, the catalyst layer 4 maintains an appropriate reaction temperature range, efficiently cleans the outside air, and reaches the discharge port 3 as a result of being transported to the discharge port 3 side as the gas moves. In most cases, it is processed into harmless carbon gas.
Therefore, even if the exhaust gas is discharged again to the outside air, the above-mentioned disadvantage does not occur.
[0030]
When the outside air contains dust such as fume, they may adhere to the oxidation catalyst 4 and shorten the catalyst life. Therefore, a dust filter 6 is installed upstream and in front of the gas inlet 2 of the apparatus.
Since this kind of dust removal filter 6 can be easily regenerated by applying jet injection, vibration, etc., it is installed separately from the processing apparatus (oxidation catalyst layer 4) in order to facilitate this kind of operation. It is preferable.
The circumstances of installing the dust filter 6 are the same for the second embodiment and below.
[0031]
When the operation of the apparatus is terminated and the sending and discharging of the outside air is stopped, the temperature of the oxidation catalyst layer 4 that has been kept in equilibrium by the reaction heat being carried out by the flowing gas during operation rapidly rises. There is a risk of deterioration. This situation may not be prevented by turning the heating means 5 of the catalyst layer 4 off.
Therefore, even after the operation is stopped until all the heat amount in the catalyst layer is carried out of the apparatus, the apparatus can be air-cooled by moving a gas feeding apparatus such as a blower, a compressor or a pump for a while. Desirable [Necessity of the operation is the same in the second embodiment and below. ].
[0032]
Even if the apparatus is in an operation preparation system and the oxidation catalyst layer 4 maintains an appropriate temperature, a processing gas that satisfies the reference value cannot be obtained at the gas outlet 3 during operation (the mode is the same as that of the third embodiment). (It will be described later in the description.) In some cases (aside from failure), there is a risk of forcing the apparatus to exceed the capacity, so the gas processing amount per unit time is reduced or the oxidation catalyst layer filled in the container It is necessary to increase the thickness of 4 (this point will also be described later).
[0033]
FIG. 2 is a cross-sectional view of the heating source 5 and the radial heat transfer fins 7 along the line II-II in FIG. 1, and the granules of the oxidation catalyst 4 are in contact with and filled on both sides of the radial heat transfer fins 7. ing. The heating of the oxidation catalyst 4 is performed through the heat source 5 and the radial heat transfer fins 7 of a good heat conductor, and the granules of the catalyst 4 are evenly heated.
In the figure, the processing gas flows in a direction perpendicular to the paper surface, for example, from top to bottom or from bottom to top, while being urged to oxidize through the granules of the oxidation catalyst 4.
[0034]
In the above embodiment, a plurality of rod-shaped electric heating means 5 are arranged in the catalyst layer 4 in order to heat the oxidation catalyst layer 4 to an appropriate temperature. However, the catalyst heating means is not limited to this. It is also possible to heat the catalyst layer 4 evenly by using a heating wire (inside the heat insulating material) surrounding the outer peripheral surface, or by passing heating steam and heating liquid around the heat transfer pipe.
In this case, the installation of the temperature sensor and its operation are indispensable.
[0035]
Example (2)
It is disadvantageous or disadvantageous for the function of the apparatus or economically that the oxidation catalyst layer 4 has a part of the catalyst having a temperature lower than the optimum reaction temperature. Therefore, the oxidation catalyst 4 in the region is made substantially zero or the oxidation catalyst. In place of No. 4, copper (aluminum, etc. is also effective) mesh 8 having good heat conduction, low cost, long life and low fluid resistance, granular layer (when filled, porous and good air permeability) It is conceivable to replace or fill in.
[0036]
FIG. 3 shows a schematic cross-sectional view of another embodiment of the present invention, in which a copper mesh 8 made of a good heat conductor is disposed so as to fill a space between the gas receiving port of the apparatus and the front surface of the oxidation catalyst layer 4. Is. Desirably, a gap is provided on the gas receiving side, but this is not necessarily required depending on the fluid resistance of the copper mesh 8.
However, for convenience in use, the mesh between the copper mesh 8 and the oxidation catalyst (palladium) layer 4 may be partitioned with a network that has low fluid resistance and does not allow the granules of the catalyst 4 to leak to the copper mesh side.
Further, it is possible to provide a gap between the oxidation catalyst layer 4 and the copper mesh 8 so as not to significantly disturb the heat radiation.
[0037]
A plurality of heat sources 5 are brought into contact with the mesh in the copper mesh 8 and are arranged uniformly in the capacity, thereby heating the copper mesh 8 uniformly.
Although depending on the configuration of the copper mesh 8, the heat source 5 is not necessarily provided with heat transfer fins because the material is a good conductor of heat. Further, only a part of the heat source may be brought into contact with the copper mesh 8.
Since the oxidation catalyst layer 4 is warmed to an appropriate temperature via the copper mesh 8, the heat source 5 in the oxidation catalyst layer 4 is not necessary in this embodiment.
[0038]
T₃  Is a temperature sensor placed in the copper mesh 8 and the temperature sensor T₃  Monitors whether or not the entire copper mesh 8 is warmed to an appropriate temperature or near a deterioration temperature.
The heating temperature of the copper mesh 8 should just be below the temperature which the oxidation catalyst 4 which adjoins or contacts deteriorates. [Depending on the kind of oxidation catalyst, there exists a thing with a high deterioration temperature. For example, palladium has a high deterioration temperature (about 200 ° C.) and is hardly affected by humidity. ].
[0039]
In FIG. 3, the temperature sensor T₃  The figure of the spindle shape surrounded by the alternate long and short dash line shows the temperature distribution in the copper mesh 8 and the oxidation catalyst layer 4 when the oxidation catalyst 4 is sufficiently preheated (hereinafter, unless otherwise specified). It is a (gradient) diagram. In the figure, the length in the horizontal direction indicates the height of the temperature at the location.
In the copper mesh 8 and the oxidation catalyst layer 4, the vicinity of the contact portion (which may be slightly separated) is high, but the temperature is considerably lower than the deterioration temperature of the oxidation catalyst 4 (however, the appropriate temperature). Higher).
Temperature sensor T₃  When detecting that the temperature of the copper mesh 8 is close to the deterioration temperature of the catalyst, the heat source 5 is shut off.
[0040]
The temperature of the copper mesh 8 is slightly lowered toward the upstream side due to heat radiation (radiant heat) to the outside air.
Temperature sensor T downstream of oxidation catalyst layer 4₅  The temperature of the nearby oxidation catalyst layer 4 is close to an appropriate value (temperature sensor T₅  Is disposed on the downstream side of the oxidation catalyst layer 4 and close to the processing gas discharge surface. ).
Temperature sensor T₅  However, when a value close to the appropriate value is detected, it is certain that the oxidation catalyst layer 4 is warmed to at least the appropriate temperature as seen from the temperature distribution diagram. Is displayed.
In this case, the temperature sensor T in the oxidation catalyst layer 4 is used.₄  Need not be installed.
Temperature sensor T₄  The function of the temperature sensor T₃  This is because there is an overlap with that.
[0041]
In order to assist in uniformly heating the oxidation catalyst layer 4, a heat insulating layer is provided so as to surround the outer peripheral surface of the oxidation catalyst layer 4, and the heat transfer from the copper mesh 8 is entirely heated to heat the oxidation catalyst layer 4. You can also For example, the heat insulating structure employed in the present embodiment is the same as that described in the first embodiment (part 1).
Also in this processing apparatus, since the oxidation catalyst layer 4 has a heat capacity, it is necessary to have a slight rise time until the whole is heated to an appropriate temperature, as in the first embodiment. The state in which the oxidation catalyst layer 4 is preheated through the copper mesh 8 as described above for the purpose of shortening or eliminating the rise time has been described.
[0042]
When the apparatus is operated in this state and the outside air is circulated in the oxidation catalyst layer 4, the temperature gradient diagram described above changes to a narrowed state due to the temperature of the copper mesh 8 being slightly cooled by the inflow of the outside air. The oxidation catalyst layer 4 is warmed by the oxidation of the carbon, and the appearance of spreading the bottom is exhibited.
The processing of outside air has progressed significantly, and the temperature sensor T₅  However, when a value close to the deterioration temperature of the oxidation catalyst 4 is detected, the heat source 5 is turned off.
[0043]
When the outside air that passes through the copper mesh, the wire mesh, etc. is warmed and reaches the oxidation catalyst layer 4, the load on the oxidation catalyst 4 is less likely to increase in temperature. Further, uniform heated air can be supplied to the front surface of the catalyst layer 4, and the temperature gradient in the catalyst layer becomes smaller than in the case of direct heating.
[0044]
Since the oxidation catalyst layer 4 has gas flow resistance, if a void is formed so that the entire surface of the gas receiving side is exposed to the outside air, the streamlines of the gas flowing in from the receiving port side are voids on the entire surface of the oxidation catalyst layer 4. Although it diffuses in, the copper mesh 8 of the oxidation catalyst layer 4 front surface also has the effect of the said space | gap.
Since the state is the same on the gas discharge side of the oxidation catalyst layer 4, a necessary gap is also provided between the catalyst layer discharge side and the gas discharge port so as not to create a dead space in the packed catalyst layer. It is desirable to use the oxidation catalyst efficiently.
[0045]
In such a case, even if the apparatus operates immediately without preheating the apparatus and the oxidation catalyst 4 is moist, the outside air is warmed while passing through the rapidly heated copper mesh 8, copper wire mesh, and the like. In order to reach the catalyst layer 4, the oxidation catalyst layer is uniformly heated and dried, so that the oxidation catalyst 4 is accelerated and the oxidation reaction is activated early.
[0046]
In the above apparatus, the temperature sensor T in the catalyst layer 4₅  In place of the temperature sensor T in the exhaust port 3₆  (The signal transmission means is shown using a dotted line). Temperature sensor T₆  The effect of the temperature sensor T₅  It acts as a proxy for
Also, a temperature sensor T arranged in the copper mesh 8₃  Instead of temperature sensor T₄  Can be provided at a suitable position in the oxidation catalyst layer 4 (the signal transmission means is shown using a dotted line).
Temperature sensor T₄  Detects whether or not the entire oxidation catalyst layer 4 has been uniformly heated to an appropriate temperature, and thereby controls on / off of the heating means 5 in the copper mesh.
[0047]
Temperature sensor T along with the flow of process gas in the oxidation catalyst layer 4₄  Of the temperature sensor T, that is, whether it is relatively upstream or downstream.₄  The temperature state in the catalyst layer 4 to be detected differs depending on. For example, temperature sensor T₄  Is the temperature sensor T in the copper mesh 8₃  Is close to the temperature sensor T₃  Are substantially the same.
Temperature sensor T₄  Is moved away from the downstream side, the temperature sensor T from the gas introduction surface side of the oxidation catalyst layer 4.₄  It is possible to detect how the temperature of the oxidation catalyst layer up to the position is warmed.
However, in such a case, the temperature sensor T in the copper mesh 8₃  Therefore, it may be necessary to ensure that the oxidation catalyst layer 4 is not warmed close to the degradation temperature.
Temperature sensor T₄  In the extreme, the temperature sensor T₅  You can overlap with.
[0048]
Example (Part 3)
FIG. 4A shows a part of another embodiment of the apparatus of the present invention in a schematic cross-sectional view, in which a carbon monoxide concentration sensor 9 is attached to the gas outlet 3 side of the apparatus.
In addition, the code | symbol attached | subjected to Fig.4 (a) is the same as what was described in the Example (the 1 and 2) [the same also in the case of FIG.4 (b)].
That is, the main part of the apparatus is the embodiment (part 1 or 2) itself [the situation is the same in the embodiment (part 4). ].
While operating the gas feeding device connected to the apparatus of this embodiment, the exhaust gas purification rate is detected by the carbon monoxide concentration sensor 9, the quality of the processing function of the device is measured, and the measured value is a predetermined value. If this is the case, an alarm is issued over the display or signal.
[0049]
When the purification failure is displayed, it is necessary to check whether or not the apparatus is ready for operation, and it is necessary to wait until the apparatus indicates an operation ready state.
Even if the device is ready for operation, if the sensor 9 display or signal does not show an appropriate value,
Reduced function of the processing apparatus (deterioration of the oxidation catalyst 4).
The concentration of carbon monoxide contained in the outside air exceeds the processing capacity (characteristic) of the processing apparatus.
Etc. are considered,
In any case, if the exhaust is continuously released into a confined space or insufficiently ventilated, there is a risk of accidents such as carbon monoxide poisoning or death of workers. It is necessary to take measures.
[0050]
Among the above, when it is clear that the carbon monoxide concentration exceeds the processing capacity of the apparatus, depending on the configuration of the apparatus, the oxidation catalyst 4 is replenished and the thickness (depth) of the catalyst layer 4 is increased. There is also a means to increase the value. After all, the flow path in the oxidation catalyst layer 4 of the processing gas is extended, and the treatment of carbon monoxide or the like is further promoted during that time.
At that time, it is expected that the fluid resistance of the oxidation catalyst layer 4 slightly increases and decreases and the processing gas volume fluctuates, but there is nothing special to note.
While observing the measured value of the concentration sensor 9, the oxidation catalyst 4 is replenished or removed until an appropriate value is reached.
The device is returned to the operating system again after setting.
[0051]
Example (4)
Another embodiment of the present invention is shown in the partial cross-sectional schematic diagram of FIG.
In this embodiment, when the carbon monoxide concentration sensor 10 is arranged in the environment where the apparatus is installed, and the carbon monoxide concentration in the outside air exceeds the reference value, a blower, a compressor or a pump connected to the processing device. The gas supply means such as the above is operated, and the gas in the environment is sent into the processing apparatus or inhaled.
In order to cope with the environment where carbon monoxide is suddenly generated, naturally, the apparatus must be preheated so that the apparatus is put in an operation preparation system before that.
[0052]
The gas properly purified through the treatment apparatus is released again into the environment or released out of the environment.
If the device is kept in an operation preparation system, when the carbon monoxide concentration sensor 10 detects that carbon monoxide exceeding the reference value has been released into the environment, the device is automatically operated and the outside air is discharged. Processing can be promoted and environmental standards can be maintained during work.
Alternatively, the apparatus may be operated manually based on a warning and display by the carbon monoxide concentration sensor 10.
[0053]
【The invention's effect】
As described above, the present invention efficiently purifies air containing carbon monoxide and other toxic gases that are inevitably generated or diffused during work, and the health of personnel who occupy or are close to the work. , Hygiene management, especially to ensure the safety of workers in a confined space and in a work environment with insufficient ventilation, and safety related to human lives.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a heat source along the line II-II in FIG.
FIG. 3 is a schematic cross-sectional view of another embodiment of the present invention.
FIG. 4 is a partial schematic cross-sectional view of another or other embodiment of the present invention.
[Explanation of symbols]
1 Container (tank)
2 Gas inlet
3 Gas outlet
4 Oxidation catalyst (layer)
5 heat sources
6 Dust removal filter
7 Heat conduction fins
8 Copper mesh
9,10 Carbon monoxide concentration sensor
Tn temperature sensor n:₁  ~₆

Claims (6)

In an apparatus for circulating and processing a gas containing a harmful gas such as carbon monoxide through an oxidation catalyst layer, a means for heating the catalyst layer as uniformly as possible is provided, and the temperature of the catalyst layer is controlled by controlling the heating source. A carbon monoxide or other treatment / removal apparatus, wherein at least one temperature sensor that operates to maintain the temperature at a proper temperature is disposed in a container containing the oxidation catalyst. In order not to locally heat the oxidation catalyst layer, a heat source and a heat transfer fin connected to the heat source and having a heat diffusion / conduction area between the heat source and the catalyst layer as wide as possible are arranged in the gas flow direction. The carbon monoxide and other treatment / removal device according to claim 1, wherein the device is embedded in a container along the surface. Between the gas inlet side in the container and the front surface of the oxidation catalyst layer, a network capacity composed of a good thermal conductor having a heating source, a granular material layer, etc. are interposed to disturb the flow of the inflowing gas. The carbon monoxide or other treatment / removal apparatus according to claim 1. 4. A gas passage is provided through any one of the gas inlet side and the gas outlet side, or a gas gap is provided between the gas inlet side and the gas outlet side with the oxidation catalyst layer interposed therebetween. Carbon monoxide or any other treatment or removal device. A carbon monoxide concentration sensor is installed on the gas outlet side or in front of it to measure the carbon monoxide concentration of the processing gas, and when it detects that the concentration exceeds the specified value, it issues a signal such as a display or alarm The carbon monoxide or other treatment / removal apparatus according to any one of claims 1 to 4. When the carbon monoxide concentration in the outside air is measured and it is detected that the concentration exceeds a predetermined value, the gas containing carbon monoxide is sent to the gas inlet side or discharged to the outlet side through the device. A gas feeding device such as a blower, a compressor, or a pump is operated, and the carbon monoxide or other treatment / removal device according to any one of claims 1 to 5.

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