JPH0985043A - Apparatus for removing nitrogen oxide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly allow mixed gas to pass through an adsorbent while dispensing with clamping work by providing a seal member coming into contact with other peripheral surface under pressure by the own wt. of the adsorbent cartridge placed on a placing part to hermetically seal a gas communication port and an opening part. SOLUTION: The opening part 90 communicating with the adsorbents 91, 92 in an adsorbent cartridge 66 is provided to the bottom surface of the adsorbent cartridge 66 and the placing plate 102 of the adsorbent cartridge 66 is provided to the floor of an adsorbent housing chamber and the gas communication port 100 allowing the opening part 90 to communicate with the lower part of the adsorbent housing chamber is provided to the placing plate 102 at the position coinciding with the opening part 90. The gas passage of either one of a gas introducing passage and a gas lead-out passage is arranged to the lower part of the adsorbent housing chamber to be connected to the gas communication port 100 and a seal material 108 coming into contact with other peripheral surface under pressure by the own wt. of the adsorbent cartridge 66 to hermetically seal the gas communication port 100 and the opening part 90 is provided to the periphery of either one of the gas communication port 100 and the opening part 90.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing low-concentration nitrogen oxides in a mixed gas discharged from an automobile tunnel, an indoor automobile parking lot, or the like.

[0002]

2. Description of the Related Art Conventionally, when exhausting an automobile tunnel or an indoor car parking lot, it has been considered to remove nitrogen oxides in exhaust gas and then release it into the atmosphere in order to reduce pollution. ing.

FIG. 15 shows an example of a device therefor. In the figure, the exhaust gas (mixed gas) flowing through the exhaust gas outlet pipe 200 is introduced into the adsorbent storage chamber 185 from the gas inlet pipe 184 with the valves 180 and 183 opened and the valves 181 and 182 closed. Agent storage room 1
A filter 186 provided inside 85 removes dust and the like in the gas. Then, the exhaust gas permeates the adsorbent 188 through the flow regulating space 187, whereby the nitrogen oxides in the exhaust gas are adsorbed by the adsorbent 188, and the remaining gas is released to the atmosphere through the gas exhaust pipe 189. .

After such an adsorption step is performed, desorption from the adsorbent 188 is performed at night or the like. Specifically, the valves 180, 183 are closed and the valves 181, 181 are
By operating the air fan 190 with the opening 182 open, the gas is circulated in the order of the circulation path 191, the gas introduction pipe 184, the adsorbent storage chamber 185, and the gas discharge pipe 189. Since the circulating gas is heated by the electric heater 193 from the air fan 190 during the circulation, the adsorbent 188 is gradually heated by the circulation of the heating gas, and the nitrogen oxides are desorbed from the adsorbent 188 to cause the circulation gas. Mix in. Ammonia (NH ₃ ) that is a reducing agent is added to the circulating gas on the downstream side of the electric heater 193, and the ammonia and the nitrogen oxides react in the denitration reactor 194 to generate the nitrogen oxides. It is reduced to harmless nitrogen gas and released into the atmosphere.

[0005]

The adsorbent 188 is
Although it is regenerated in the desorption process described above, the adsorption performance gradually deteriorates when it is used for a long period of time. Therefore, the adsorbent 188
However, since the adsorbent 188 is granular, it is not easy to replace it. As a means for facilitating this replacement work, it is conceivable to fill a plurality of cartridges with the adsorbent 188 and store these cartridges in the adsorbent storage chamber 185. It is extremely difficult to ensure that the mixed gas introduced into 185 is passed through the adsorbent 188 and then discharged.

In view of the above circumstances, the present invention ensures that the mixed gas to be treated is passed through the adsorbent while filling the cartridge with the adsorbent for removing nitrogen oxides and facilitating the replacement thereof. It is an object of the present invention to provide a device for removing nitrogen oxides capable of performing the above.

[0007]

As a means for solving the above-mentioned problems, the present invention relates to an adsorbent storage chamber in which an adsorbent is stored and a mixed gas containing nitrogen oxides is introduced during the adsorption step. A gas introduction passage for introducing the mixed gas into the adsorbent storage chamber, and a gas derivation passage for leading out the treated gas from which the nitrogen oxides have been adsorbed and removed in the adsorbent storage chamber from the adsorbent storage chamber. In the nitrogen oxide removing device provided, the adsorbent is filled in an adsorbent cartridge having an outer wall having a shape in which the adsorbent is communicated to the outside through a predetermined surface other than the bottom surface and all surfaces other than the predetermined surface are blocked. While the opening of the adsorbent cartridge communicating with the adsorbent in the cartridge is provided on the bottom surface of the adsorbent cartridge, the adsorbent cartridge mounting portion is provided on the floor of the adsorbent storage chamber. Match A gas communication port that communicates this opening below the adsorbent storage chamber, and one of the gas introduction passage and the gas discharge passage is disposed below the adsorbent storage chamber. While connecting to the gas communication port, the gas communication port is connected to the periphery of either the gas communication port or the opening by pressure contact with the surface of the other periphery due to the weight of the adsorbent cartridge mounted on the mounting part. A seal member for sealing the mouth and the opening is provided.

According to this apparatus, since the adsorbent is placed in the adsorbent cartridge in the placement section in the adsorbent cartridge, the adsorbent can be easily exchanged in cartridge units. In addition, a seal member is provided around the opening on the bottom surface of the adsorbent cartridge or around the gas communication port of the above-mentioned mounting portion, and when the adsorbent cartridge is mounted on the mounting portion, the sealing member is opposed by its own weight. Since it is pressed against the surface of No. 3, the opening and the gas communication port can be sealed only by placing the adsorbent cartridge without using a special tightening member. With such a seal, the gas introduced through the gas introduction passage is surely discharged to the gas discharge passage through the adsorbent.

In order to communicate the adsorbent with the predetermined surface of the adsorbent cartridge, for example, a net having a finer mesh than the adsorbent may be provided on the predetermined surface, and the adsorbent may be filled inside the net. .

In the present invention, a gas introduction passage is connected to the gas communication port, the mixed gas is introduced into the adsorbent cartridge through the gas communication port and the opening of the adsorbent cartridge, and the mixed gas is transmitted to the adsorbent. The adsorbent storage chamber may be discharged to the gas outlet passage, but the gas inlet passage is connected to the side wall of the adsorbent housing chamber and the gas outlet passage is connected to the gas communication port to introduce the gas. If the mixed gas is introduced from the side into the adsorbent storage chamber through the passage, the mixed gas is allowed to permeate through the adsorbent, and then the mixed gas is led out to the gas outlet passage through the cartridge opening and the gas communication port. On the other hand, the mixed gas can be contacted more uniformly. Further, the height of the entire apparatus can be made smaller than in the case where gas is introduced into the adsorbent storage chamber from above.

In this case, the predetermined surface of the adsorbent cartridge may be set on the upper surface of the adsorbent cartridge.
When the mixed gas is introduced from the side into the adsorbent storage chamber as described above, the predetermined surface is set on the side surface of the adsorbent cartridge so that the mixed gas comes into contact with the adsorbent from the side. By doing so, it becomes possible to more uniformly pass the mixed gas through the adsorbent.

Specifically, the above-mentioned adsorbent cartridge is
With a shape having two side surfaces, a pair of surfaces facing each other is used as a surface for communicating the adsorbent to the outside, and an adsorbent layer is formed just inside these surfaces, and the outer surface of the other cartridge is covered with an outer wall. , A gas communication space communicating with the opening may be formed between the adsorbent layers, or the adsorbent cartridge may be formed in a cylindrical shape, and the outer peripheral surface thereof may be used as a surface for communicating with the outside. A cylindrical adsorbent layer may be formed immediately inside the surface of the cartridge, the upper surface of the cartridge may be covered with an outer wall, and a gas communication space communicating with the opening may be formed radially inside the adsorbent layer. . In these cases, the adsorbent cartridge can be made small and a large communication surface for the adsorbent can be secured.

The adsorbent layer in the adsorbent cartridge may be a single layer, or a plurality of adsorbent layers made of different adsorbents may be laminated. In the latter case, the adsorbent can be surely passed through each adsorbent layer in a desired order.

Each of the adsorbent cartridges may be put in and taken out from above the adsorbent storage chamber, but a cartridge storage space is arranged beside the adsorbent storage chamber, and the cartridge storage space and the adsorbent storage chamber are arranged. A cartridge inlet / outlet communicating with and is provided on the side wall of the adsorbent storage chamber, and if an opening / closing means for opening / closing the cartridge inlet / outlet is provided, the adsorbent cartridge can be loaded / unloaded to / from the adsorbent storage chamber from the side by running a forklift truck or the like. Easy to do. Further, the height dimension of the entire device is reduced.

Although there may be a single adsorbent storage chamber,
In this case, the nitrogen oxides cannot be removed at all during the period for regenerating the adsorbent in the adsorbent storage chamber (that is, the desorption process period). On the other hand, the adsorbent storage chamber is divided into a plurality of sections, and the adsorbent storage chamber is in a communication state in which the adsorbent storage chamber is in communication with the gas introduction passage and the gas derivation passage, and a disconnection state in which the adsorbent storage chamber is shut off from the gas introduction passage and the gas derivation passage. Storage chamber switching means that can be switched to, and connected to each adsorption chamber,
A gas circulation passage for circulating the gas desorbed from the adsorbent in the adsorbent storage chamber in a state where the storage chamber switching means is switched to a shutoff state, and provided in the middle of the gas circulation passage,
If a denitration means for denitrifying the circulating gas and a circulation switching means for switching between a state in which the gas circulation passage and the adsorbent storage chamber are in communication with each other and a state in which the gas circulation passage is shut off, a part of the adsorbent storage chamber is provided. Is disconnected from the gas introduction passage and the gas discharge passage and communicates with the gas circulation passage. While the desorption process is performed by the gas circulation through the gas circulation passage, the remaining adsorbent storage chamber is cut off from the gas circulation passage to remove the gas. By communicating with the inlet passage and the gas outlet passage, nitrogen oxide can be removed using this adsorbent storage chamber.

In this case, the gas inlet passage and the gas outlet passage may be individually connected to each adsorbent storage chamber, but the plurality of adsorbent storage chambers are in a direction substantially equal to the horizontal direction orthogonal to the gas introduction direction. If the gas inlet passage and the gas outlet passage are connected to these adsorbent storage chambers, the structure of the entire apparatus can be further simplified.

When there are a plurality of adsorbent storage chambers, a common cartridge storage space is arranged beside each adsorbent storage chamber, and the cartridge storage space communicates with each adsorbent storage chamber. By providing an inlet / outlet on each side wall of each adsorbent storage chamber and providing an opening / closing means for individually opening / closing each cartridge inlet / outlet, an adsorbent cartridge can be supplied from a common cartridge storage space into each adsorbent storage chamber. The adsorbent cartridge in each adsorbent storage chamber can be collected in a common cartridge storage space. That is, the adsorbent cartridges in the adsorbent storage chambers can be collectively replaced through the common cartridge storage space. Further, the cartridges in all the adsorbent storage chambers can be exchanged with a single conveying means.

The cartridge storage space is preferably installed at a position directly above the gas passage connected to the gas communication port of the adsorbent storage chamber in the gas introduction passage and the gas discharge passage. This makes it possible to effectively use the space.

In this case, if a cartridge transfer path is provided at the center of the floor of each adsorbent storage chamber and is continuous with the cartridge inlet / outlet, and if the adsorbent cartridge and the gas communication port are arranged at the left and right sides of the cartridge transfer path, the cartridge can be replaced. Through the transport path, it is possible to smoothly collect the adsorbent cartridge from each mounting part and to supply the adsorbent cartridge to each mounting part, and to efficiently install the adsorbent cartridge in a small installation space inside the adsorbent storage chamber. Can be arranged well.

In each of the above devices, when not only nitrogen oxides in the mixed gas but also dust is removed, a dust collector may be provided in the gas introduction passage.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described with reference to FIGS.

The concrete structure 10 shown in FIG. 1 is buried underground, and two reciprocating tunnels 12 are provided at the bottom thereof, and a roadway 14 is laid in each tunnel 12. A nitrogen oxide removing device 16 is installed in a region having a height dimension H between the both tunnels 12 and the road 15 on the ground, and the gas in the tunnel 12 is processed by the nitrogen oxide removing device 16. After that, it is discharged to the atmosphere through the discharge pipe 32.

The structure of the nitrogen oxide removing device 16 is shown in FIG.
~ Shown in FIG. The nitrogen oxide removing device 16 has a second floor structure. FIG. 2 shows the second floor structure and FIG. 3 shows the first floor structure.

On the second floor of the nitrogen oxide removing device 16, a small-width inlet 18 leading to the inside of the tunnel 12, an enlarged space 20 extending in the width direction from the inlet 18, and a rectification extending from the enlarged space 20 with a constant width. A space 22 is provided,
An inlet screen 21 is provided at the inlet 18, and an electrostatic precipitator 2 for removing dust is provided at the inlet of the rectifying space 22.
4 is arranged, and the electric chamber 25 is arranged on the side thereof.

On the downstream side of the electrostatic precipitator 24, a plurality (four in the illustrated example) of adsorbent storage chambers 26A are arranged in a direction substantially equal to the horizontal direction orthogonal to the gas introduction direction (the right direction in FIG. 2).
26B, 26C, and 26D are arranged, and ducts 27A, 27B, 27C, and 27D are provided in the first floor portion immediately below each of the adsorbent storage chambers 26A, 26B, 26C, and 26D. Each of the ducts 27A to 27D has openings at both ends in the longitudinal direction of the device (the left-right direction in FIGS. 2 and 4), and the opening on the side opposite to the inlet 18 communicates with the common throttle 28. There is. The throttle unit 28 has a filter 29, is connected to the exhaust pipe 32 via a gas outlet passage 30, and an auxiliary fan 31 for exhausting gas is provided in the middle of the gas outlet passage 30.

The other opening (the opening on the same side as the inlet 18) of each of the ducts 27A to 27D serves as a circulating gas outlet 33. Circulating gas inlets 42 are provided on the ceiling walls of the adsorbent storage chambers 26A to 26D, and the circulating gas inlets 42 and the circulating gas outlets 33 are connected to each other through a gas circulation passage 34. This gas circulation passage 34 has a common collecting pipe 35 connected to each circulation gas outlet 33,
An air fan 36, a circulating air heater 38, and a denitration reactor 40 are provided on the downstream side thereof. The gas circulation passage 34 is also provided with a cooling bypass passage 44 that bypasses the circulating air heater 38 and the denitration reactor 40.

In the portion of the gas circulation passage 34 between the circulating air heater 38 and the denitration reactor 40, an ammonia water storage container 46 as shown in FIGS. 6 and 7 has an ammonia water supply pump 48. Connected through. Further, in the gas circulation passage 34, a portion on the upstream side of the air fan 36 is connected to the gas discharge passage 30 via a cooling gas passage 49, and a portion on the downstream side of the denitration reactor 40 is an expansion gas escape passage. 50 through the rectifying space 2
Connected to 2.

Each adsorbent storage chamber 26A, 26B, 26C,
A valve (storage chamber switching means) 52 is provided at the mixed gas inlet of 26D.
A, 52B, 52C, 52D are provided, and the duct 27
Valves (storage chamber switching means) 54A, 54B, 54C and 54D are provided at the gas outlets to A, 27B, 27C and 27D. Each adsorbent storage chamber 26A, 26B, 26C, 2
A valve (circulation switching means) 56A, 5 is provided at the circulating gas outlet of 6D.
6B, 56C and 56D are provided, and valves (circulation switching means) 58A, 58B, 58C and 58D are provided at the circulating gas inlet. Furthermore, an intermediate portion of the cooling bypass passage 44, a portion between the denitration reactor 40 and the downstream end of the cooling bypass passage 44, an intermediate portion of the cooling gas passage 49,
Valves 60, 62, 63, 64 are provided in the middle of the expansion gas escape passage 50, respectively.

As shown in FIG. 8, each adsorbent storage chamber 26
A plurality of adsorbent cartridges 66 are housed in A to 26D. Specifically, each adsorbent storage chamber 26A-2
A cartridge conveyance path 68 extending in a direction parallel to the gas introduction direction (horizontal direction in FIG. 8) is laid at the center of the 6D in the horizontal direction (vertical direction in FIG. 8).
A plurality of adsorbent cartridges 66 are arranged in a line on both sides sandwiching, respectively.

On the side walls of the adsorbent storage chambers 26A to 26D which are opposite to the inlet 18 (on the right side in FIG. 8), cartridge inlets / outlets 70A, 70B, 70C and 70D connected to the cartridge conveying path 68 are provided. The cartridge entrances 70A and 70B are provided respectively.
A slide type door (opening / closing means) 71 for opening / closing the cartridge and a slide type door (opening / closing means) 72 for opening / closing the cartridge inlets / outlets 70C and 70D are provided.

A single cartridge storage space 74 is adjacent to the adsorbent storage chambers 26A to 26D from the side, and the cartridge inlet / outlet 7 is inserted into the cartridge storage space 74.
The adsorbent storage chambers 26A to 26D can communicate with each other via 0A to 70D. This cartridge storage space 74
As shown in FIG. 4, is the duct 2
It is arranged at a position directly above 7A to 27D. In this cartridge storage space 74, a storage space 76 for storing a replenishment or recovery adsorbent cartridge 66,
This storage space 76 and each cartridge entrance / exit 70A-70
A traveling path 78 for transporting a transporting means such as a forklift truck is provided between the cartridge entrances 70A to 70D and the storage space 76.
The turntables 80A, 80B, 80 for changing the traveling direction of the conveying means are provided in a portion adjacent to the entrance of the vehicle.
C, 80D and 80E are provided.

The structure of the adsorbent cartridge 66 is shown in FIG.
11 to FIG. The adsorbent cartridge 66 has a substantially rectangular parallelepiped shape, and its outer wall is composed of a top wall 82, a bottom wall 84, and a pair of side walls 83 facing each other.

In FIG. 10, reference numeral 85 denotes an ear portion provided in the middle stage of the side wall 83 as a lifting margin when the entire cartridge is conveyed by the forklift truck or the like.

A pair of outer wire nets 86, a pair of intermediate wire nets 87, and a pair of inner wire nets 88 are arranged at intervals between the side walls 83 in order from the outside. Then, from the adsorbent filling port 93 provided on the ceiling wall 82 to the wire mesh 8
The first adsorbent 91 is filled between 6, 87, and the wire mesh 8 is inserted from the adsorbent filling port 94 also provided in the ceiling wall 82.
The second adsorbent 92 is filled between 7, 88, and the gas communication space 89 is secured between the inner wire nets 88. In this embodiment, the first adsorbent 91 has a capability of oxidizing NO (nitric oxide) or accelerating an oxidation reaction to NO ₂ (nitrogen dioxide) and adsorbing NO and NO ₂ to some extent. (For example, a carbonaceous material) that is filled with a material (for example, a composite metal oxide material) and has the ability to adsorb NO and NO ₂ and reduce NO ₂ to NO as the second adsorbent 92. ) Is filled.

In the present invention, various adsorbents suitable for adsorbing nitrogen oxide NOx can be used regardless of the specific type of adsorbent. For example, when only NO ₂ is removed, only the second adsorbent 92 needs to be filled.
Further, it is necessary to use the metal nets 86 to 88 having finer meshes than the particle size of the adsorbent contacting them, and the metal mesh having such fine meshes and the relatively coarse mesh for reinforcement. A more preferable cartridge can be obtained by stacking the wire mesh and the wire mesh.

In the bottom wall 84, the gas communication space 8
At the position immediately below 9, there is an opening 9 of the same shape (rectangle).
0 is penetratingly provided, and a rectangular annular sealing groove 98 opening downward is formed in the periphery thereof. Positioning pins 96 are provided at a plurality of locations on the bottom wall 84, respectively.

On the other hand, the floor 2 of the adsorbent storage chambers 26A to 26D
A gas communication port 100 penetrating the floor 26f is formed at a place where each adsorbent cartridge 66 is placed in 6f, and the ducts 27A to 2A are formed in the gas communication port 100.
7D are each connected.

On the upper surface of the floor 26f, a mounting plate 102 as shown in FIG. 12 is fixed to the place where each gas communication port 100 is formed. On the mounting plate 102, a gas communication port 104 having the same shape as the opening 90 of the cartridge bottom wall 84 is formed, and at the position facing the sealing groove 98, the gas communication port 104 has the same shape. A sealing groove 106 is formed, and a positioning hole 110 into which the positioning pin 96 can be fitted is formed at a position facing the positioning pin 96, and rubber or the like is formed in the sealing groove 106 along the positioning hole 110. An annular seal member 108 made of an elastic member is fitted. Then, as shown in FIG. 11B, the adsorbent cartridge 6 is placed at a position where the positioning pin 96 and the positioning hole 110 are fitted to each other.
By mounting 6 on the mounting plate 102, the cartridge side opening 90 and the mounting plate side gas communication port 104 are aligned with each other, and the sealing material 108 is provided with the sealing grooves 98, 10.
It is sandwiched between 6 and is pressed against the seal grooves 98 and 106 by the own weight of the adsorbent cartridge 66, and the opening 90
The gas communication port 104 is sealed from the outside.

The seal material 108 may be fitted in the seal groove 98 on the cartridge side.

Next, the operation of this device will be described. In this device, three of the four adsorbent storage chambers 26A to 26D are used.
The adsorption process (nitrogen oxide removal process) is performed using one adsorbent storage chamber, and at the same time, the desorption process (regeneration process) is performed in the remaining one adsorbent storage chamber, and this desorption process is performed. By sequentially switching the agent storage chambers, the nitrogen oxide removal processing is continuously performed. However, in the following, as an example, the adsorption step is performed using the adsorbent storage chambers 26A to 26C, and the adsorbent storage chambers are performed. The case where the desorption process is performed at 26D will be described.

In this case, the valves 52A and 52 shown in FIG.
B, 52C, 54A, 54B, 54C, 56D, 58
D, 62, 64 are opened and valves 52D, 54D, 56A,
56B, 56C, 58A, 58B, 58C, 60, 63
Is closed, and all the cartridge entrances / outlets 70A to 70D shown in FIG. 8 are also closed by the doors 71 and 72.

In this state, the mixed gas in the tunnel 12 is subjected to a dust removing process by the electrostatic precipitator 24, and then the rectifying space 2
2 is introduced into each adsorbent storage chamber 26A, 26B, 26C. The side walls of these adsorbent storage chambers 26A to 26C are closed, and the adsorbent cartridge 66 is also provided.
Since the opening 90 and the periphery of the gas communication port 104 are sealed by the sealing material 108 that has received its own weight, all the introduced gas is transmitted through the first adsorbent 91 and the second adsorbent 92 in this order, and then the gas is introduced. It penetrates into the communication space 89. here,
During the permeation of the first adsorbent 91, the NO in the mixed gas is NO.
_As it is oxidized to ₂ , NO and NO ₂ are adsorbed and the second
Since NO and NO ₂ are adsorbed during the permeation of the adsorbent 92, the processed gas from which NOx has been removed with high precision will enter the gas communication space 89. This processed gas is used for the opening 90 of the bottom wall 84 and the gas communication port 1 thereunder.
04, 100 in order to reach the inside of the ducts 27A to 27C, and the auxiliary fan 31 sucks the air and discharges it to the atmosphere through the discharge tube 32.

On the other hand, the inside of the adsorbent storage chamber 26D is sucked by the air fan 36 and is circulated by the circulating air heater 38 while circulating the mixed gas containing nitrogen oxides desorbed from the adsorbent.
It is heated to 80 ° C. to 200 ° C., mixed with the ammonia water supplied from the ammonia water supply pump 48, and introduced into the denitration reactor 40. In the denitration reactor 40, the denitration reaction shown in the following (Chemical Formula 1) is promoted and nitrogen oxides are reduced to harmless nitrogen gas. For example, in the case of NO, the following chemical reaction is promoted in the denitration reactor 40.

[0044]

## STR1 ## 4NO + 4NH ₃ + O ₂ → 6H ₂ O + 4N _{2 In} principle, the gas discharged from the denitration reactor 40 is returned to the adsorbent storage chamber 26D, and the desorption of the adsorbent storage chamber 26D is performed by such gas circulation. The process is advanced. The surplus generated by the expansion of the circulating gas by heating the circulating gas is appropriately returned to the rectifying space 22 through the expansion gas escape passage 50, thereby preventing an abnormal increase in the circulating gas pressure.

At the stage where the above heating and circulating process is completed, the adsorbent storage chamber 26D is shifted to the cooling process shown in FIG. In this step, the valves 62, 64 and 56D are closed and the valves 63, 60 and 54D are opened. As a result, the low-temperature gas partially discharged from the gas discharge passage 30 is mixed with the circulating gas through the cooling gas passage 49 and directly returned to the adsorbent storage chamber 26D through the cooling bypass passage 44, and the adsorbent storage chamber 26D. The adsorbent therein is cooled, mixed with the treated gas in the gas discharge passage 30, and discharged to the atmosphere.

By the above-mentioned regeneration process, the adsorption capacity of the adsorbents 91 and 92 in each adsorbent cartridge 66 is almost completely restored, but the adsorption capacity gradually decreases when it is used for a long time. It is necessary to replace the adsorbent regularly.

Here, conventionally, since the adsorbent was directly stored in the adsorbent storage chamber in a granular form, it was very troublesome to replace the adsorbent, but in this device, the adsorbent can be easily replaced in cartridge units. it can.

Specifically, the adsorbent storage chamber (for example, the adsorbent storage chamber 26) in which the cartridge to be replaced is stored.
The cartridge inlet / outlet 70A of A) is opened, and the cartridge conveying means provided in the cartridge storage space 74 shown in FIG. By advancing along to the storage space 76 in the cartridge storage space 74, the adsorbent cartridge 66 can be easily carried out of the adsorbent storage chamber 26A. In addition, the new adsorbent cartridge 66 stored in the storage space 76 is similarly lifted by the above-mentioned conveying means, and is made to enter the appropriate adsorbent storage chamber along the traveling path 78, so that the vacant mounting portion 1 is placed.
By mounting the adsorbent cartridge 66 on the No. 02, the cartridge 66 can be replenished.

When mounting the adsorbent cartridge 66,
Since the sealing grooves 98 and 106 and the sealing material 108 are automatically brought into pressure contact with each other due to their own weight, it is not necessary to tighten a tightening member such as a bolt in order to perform sealing, and the replacement work is extremely simple.

As the replacement work progresses, the number of new cartridges in the cartridge storage space 74 decreases and the number of used cartridges increases. Cartridge storage space 7
Put it in 4 The used cartridge that has been taken out is subjected to appropriate treatment such as quenching in another facility so that it can be reused.

The embodiment of the present invention is not limited to this, and the following embodiment may be adopted, for example.

(1) Adsorbent storage chamber 26A shown in the drawing
26D, the gas communication passage 100 may be connected to the gas introduction passage and the side wall may be connected to the gas derivation passage. In this case, the mixed gas is the gas communication ports 100, 104.
And, it enters into the adsorbent cartridge 66 through the adsorbent cartridge opening 90, is discharged into the adsorbent storage chambers 26A to 26D through the adsorbent, and is led out through the gas outlet passage. However, as in the above embodiment, the gas introduction passage is connected to the side walls of the adsorbent storage chambers 26A to 26D, and the duct 2 is connected to the gas communication port 100.
By connecting the gas outlet passages composed of 7A to 27D, the mixed gas can be brought into contact with each adsorbent more uniformly. Further, since the height dimension H of the entire apparatus can be made smaller than the case where gas is introduced into the adsorbent storage chamber from above, it is more advantageous when the apparatus is provided in a limited area like the tunnel equipment shown in FIG. Become.

(2) The surface of the adsorbent cartridge that allows the adsorbent to communicate with the outside may be set on the upper surface of the cartridge. However, as described above, the adsorbent storage chamber 26A to
When introducing the mixed gas from the side with respect to 26D,
Set the above-mentioned predetermined surface on the side surface of the adsorbent cartridge 66,
If the mixed gas is brought into contact with the adsorbent from the side, the mixed gas can be passed through the adsorbent more smoothly.

Further, even when the adsorbent is communicated with the side surface of the cartridge in this way, the structure is not limited to that shown in the above embodiment, and, for example, as shown in FIG. 13, the columns 93 are arranged at the four corners of the cartridge. Alternatively, an adsorbent layer may be formed between the columns 93 to form the gas communication space 89 in the center, or as shown in FIG. 14, the adsorbent cartridge 66 may be formed in a cylindrical shape. Cylindrical adsorbent layers are formed immediately inside these surfaces, with their outer peripheral surfaces communicating with the outside, the cartridge upper surface is covered with an outer wall, and a gas communication space 89 is formed radially inside the adsorbent layers. You may do it. In either case, the opening 90 may be provided below the gas communication space 89. Especially in FIG.
In the case of this structure, there is an advantage that the adsorbent cartridge itself can be made small and a large communication surface of the adsorbent can be secured.

(3) The adsorbent layer in the adsorbent cartridge is 2
The layer is not limited to a single layer, and may be a single layer or three or more layers.

(4) Each adsorbent cartridge may be taken in and out from above the adsorbent storage chamber. However,
In this case, the adsorbent cartridge having a relatively large weight has to be moved up and down with a large stroke, which requires a large-scale device and disadvantageously increases the height of the entire device. As described above, the cartridge storage space 74 is arranged on the side of the adsorbent storage chambers 26A to 26D.
If the cartridge inlets / outlets 70A to 70D that communicate with the adsorbent storage chambers 26A to 26D are provided on the side wall of the storage chamber, the cartridge storage space 74 and the adsorbent storage chamber 26
It is possible to easily carry the cartridge between A to 26D by running a forklift truck, and
There is an advantage that the height dimension H of the entire device can be reduced. Especially,
By arranging the cartridge storage space 74 at a position directly above the gas passage (the throttle portion 28 and the gas discharge passage 30 in FIG. 4) connected to the gas communication port 100, a rational layout can be obtained, and the entire apparatus can be further improved. Can be compactly assembled.

(5) The number of adsorbent storage chambers is not particularly limited, and may be a single number. However, in the case of setting a plurality of adsorbent storage chambers, if a plurality of adsorbent storage chambers are arranged in a direction substantially equal to the horizontal direction orthogonal to the gas introduction direction and a common gas introduction passage and gas discharge passage are connected to these adsorbent storage chambers. The structure of the entire device can be further simplified. Furthermore, if the adsorbent storage chambers 26A to 26D are communicated with the common cartridge storage space 74 as described above, the adsorbent cartridges can be supplied from the common cartridge storage space 74 into the adsorbent storage chambers. The adsorbent cartridge in the adsorbent storage chamber can be collected in the common cartridge storage space 74. Therefore, the adsorbent cartridges 66 in the adsorbent storage chambers 26A to 26D can be collectively replaced through the common cartridge storage space 74, and all the adsorbent storage chambers 2 can be replaced by a single transfer means.
There is an advantage that the cartridges 6A to 26D can be replaced.

Further, as an installation place of the cartridge storage space 74, a gas passage connected to the gas communication port of the adsorbent storage chamber in the gas introduction passage and the gas discharge passage (in the illustrated example, the throttle portion 28 and the gas discharge). By selecting a location just above the road 30), the space can be effectively used.

(6) The number and arrangement of adsorbent cartridges in each adsorbent storage chamber may be set freely. However, when the adsorbent cartridge 66 is taken in and out from each side of the adsorbent storage chambers 26A to 26D as described above, a cartridge connected to the cartridge inlets and outlets 70A to 70D at the center of the adsorbent storage chamber as shown in FIG. By providing the transfer path 68 and arranging the adsorbent cartridge 66 and the gas communication port 104 at the left and right sides of the cartridge transfer path 68, the replacement operation of the adsorbent cartridge 66 can be smoothly performed through the cartridge transfer path 68. In addition, the adsorbent cartridges 66 can be efficiently arranged in a small installation space inside the adsorbent storage chamber.

When arranging the cartridges in which the pair of side surfaces are the adsorbent communication surface as shown in FIG. 9, the communication surface is oriented in the left-right direction of the adsorbent storage chamber (that is, one of the communication surfaces). It is preferable to set the adsorbent cartridge 66 so that the surface thereof faces the cartridge conveyance path 68). As a result, the mixed gas can be transmitted substantially evenly to both communicating surfaces.

[0061]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the adsorbent is placed in an adsorbent cartridge having an outer wall having a shape that allows the adsorbent to communicate with the outside through a predetermined surface other than the bottom surface and blocks all surfaces other than the predetermined surface. The bottom surface of this adsorbent cartridge is filled with an opening communicating with the adsorbent in the cartridge, while the adsorbent cartridge mounting portion is provided on the floor of the adsorbent storage chamber. A gas communication port that connects this opening to the lower part of the adsorbent storage chamber is provided at a position that matches with, and one of the gas introduction passage and the gas discharge passage is disposed below the adsorbent storage chamber. While being connected to the gas communication port, the gas communication port, around either one of the openings, the gas is brought into pressure contact with the surface of the other periphery due to the weight of the adsorbent cartridge mounted on the mounting part. Communication port and opening Since it is provided with a sealing member for sealing the can be easily exchanged adsorbent cartridge units. Moreover, when the adsorbent cartridge is placed, its own weight automatically seals the cartridge opening and the gas communication port of the adsorbent storage chamber from the outside, so a special tightening member for this sealing is tightened. While eliminating the work
The above-mentioned seal has an effect that the mixed gas can be reliably transmitted through the adsorbent.

Particularly, a gas introduction passage is connected to the side wall of the adsorbent storage chamber, a gas outlet passage is connected to the gas communication port, and the mixed gas is introduced from the side into the adsorbent storage chamber through the gas introduction passage. If the mixed gas is permeated through the adsorbent and then led out to the gas outlet passage through the cartridge opening and the gas communication port, the mixed gas can be brought into contact with each adsorbent more uniformly, The height of the entire apparatus can be made smaller than in the case where gas is introduced into the adsorbent storage chamber from above.

In this case, by allowing the adsorbent to communicate with the side surface of the adsorbent cartridge so that the mixed gas comes into contact with the adsorbent from the side, the mixed gas can be more smoothly passed through the adsorbent. .

In particular, the adsorbent cartridge has a shape having four side surfaces, and a pair of surfaces facing each other are used as surfaces for communicating the adsorbent to the outside, and adsorbent layers are formed immediately inside these surfaces, respectively. Then, the outer surface of the other cartridge is covered with an outer wall, and a gas communication space that communicates with the opening is formed between both adsorbent layers, or the adsorbent cartridge is formed into a columnar shape, and A cylindrical adsorbent layer is formed just inside these surfaces to connect the outer peripheral surface to the outside, a cartridge upper surface is covered with an outer wall, and a gas communicating with the opening is radially inside the adsorbent layer. According to the structure in which the communication space is formed, it is possible to obtain the effect of ensuring a large communication surface for the adsorbent while making the adsorbent cartridge small.

The adsorbent layer in the adsorbent cartridge may be a single layer, or a plurality of adsorbent layers made of different adsorbents may be laminated. In the latter case, the adsorbent can be surely passed through each adsorbent layer in a desired order.

A cartridge storage space is arranged on the side of the adsorbent storage chamber, and a cartridge inlet / outlet for communicating the cartridge storage space with the adsorbent storage chamber is provided on the side wall of the adsorbent storage chamber, and the cartridge inlet / outlet is opened / closed. According to the one having the opening / closing means for opening / closing the adsorbent cartridge from the side of the adsorbent storage chamber, unlike the case where the adsorbent is loaded / unloaded from above, the loading / unloading of the adsorbent cartridge to / from the adsorbent storage chamber is performed. This can be easily performed by running a forklift truck or the like, and the height of the entire device can be reduced.

Further, the adsorbent storage chamber is divided into a plurality of parts, and each adsorbent storage chamber is connected to the gas introduction passage and the gas derivation passage in a communicating state and a shut-off state in which the adsorbent storage chamber is shut off from the gas introduction passage and the gas derivation passage. And a gas circulation passage connected to each adsorption chamber for circulating the gas desorbed from the adsorbent in the adsorbent storage chamber when the storage chamber switching means is switched to the closed state. Provided with denitration means provided in the middle of this gas circulation passage for denitrifying the circulation gas, and circulation switching means for switching between a state in which the gas circulation passage and the adsorbent storage chamber are in communication and a state in which they are shut off According to the above, some of the adsorbent storage chambers are cut off from the gas introduction passage and the gas discharge passage to communicate with the gas circulation passage, and the desorption process is performed by gas circulation through the gas circulation passage. While, by communicating the remaining adsorbent storage chamber shut off from the gas circulating passage to the gas introducing passage and the gas leading passage, the effect is obtained that can always continue to the step of removing the nitrogen oxides.

In this case, by arranging a plurality of adsorbent storage chambers in a direction substantially equal to the horizontal direction orthogonal to the gas introduction direction, and connecting a common gas introduction passage and gas discharge passage to these adsorbent storage chambers. The structure of the entire device can be further simplified.

Further, a common cartridge storage space is arranged on the side of each adsorbent storage chamber, and a cartridge inlet / outlet for communicating this cartridge storage space with each adsorbent storage chamber is provided on each side wall of the adsorbent storage chamber. If the opening / closing means for individually opening / closing each cartridge entrance / exit is provided, the adsorbent cartridges in the adsorbent storage chambers can be collectively replaced through the common cartridge storage space, and the cartridges in the cartridge storage space can be replaced. There is an advantage that the number of operations can be reduced. Further, there is also an advantage that the cartridges in all the adsorbent storage chambers can be replaced by a single conveying means.

Further, if the cartridge storage space is provided directly above the gas passage connected to the gas communication port of the adsorbent storage chamber in the gas introduction passage and the gas discharge passage, the space can be effectively utilized. The entire device can be made more compact.

Further, if a cartridge transfer path is formed in the center of each adsorbent storage chamber and is connected to the cartridge entrance / exit, and the adsorbent cartridge and the gas communication port are arranged at the left and right sides of the cartridge transfer path, the cartridge transfer path can be arranged. Through this, it is possible to smoothly collect the adsorbent cartridge from each mounting part and supply the adsorbent cartridge to each mounting part, and efficiently arrange the adsorbent cartridge in a small installation space inside the adsorbent storage chamber. The effect that can be obtained is obtained.

In each of the above devices, if the dust collector is provided in the middle of the gas introducing passage, not only the nitrogen oxides in the mixed gas but also the dust can be removed by the dust collector.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing tunnel equipment equipped with a nitrogen oxide removing device of the present invention.

FIG. 2 is a cross-sectional plan view showing a second floor structure of the nitrogen oxide removing apparatus.

FIG. 3 is a cross-sectional plan view showing a first-order structure of the nitrogen oxide removing apparatus.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is a flow sheet of the above nitrogen oxide removing device.

FIG. 7 is a flow sheet of the nitrogen oxide removing device.

FIG. 8 is a cross-sectional plan view showing an adsorbent storage chamber and a cartridge storage space provided in the nitrogen oxide removing device.

FIG. 9 is a partial cross-sectional perspective view of an adsorbent cartridge used in the nitrogen oxide removing apparatus as seen from above.

FIG. 10 is a perspective view of the adsorbent cartridge as seen from below.

FIG. 11A is a sectional front view showing a state before the adsorbent cartridge is placed on the placing plate, and FIG. 11B is a state in which the adsorbent cartridge is placed on the placing plate. It is a cross-sectional front view.

FIG. 12 is a sectional view taken along line CC of FIG.

FIG. 13 is a sectional plan view showing a modified example of the adsorbent cartridge.

FIG. 14 is a cross-sectional plan view showing a modified example of the adsorbent cartridge.

FIG. 15 is a flow sheet showing an example of a conventional nitrogen oxide removing device.

[Explanation of symbols]

16 Nitrogen oxide removing device 18 Inlet 20 Expanded space (gas introduction passage) 22 Rectification space (gas introduction passage) 24 Electrostatic precipitator 26A, 26B, 26C, 26D Adsorbent storage chamber 27A, 27B, 27C, 27D Duct (gas discharge passage) ) 28 throttle part (gas outlet passage) 30 gas discharge passage (gas outlet passage) 34 gas circulation passage 38 circulating air heater (denitration means) 40 denitration reactor (denitration means) 46 ammonia water supply pump (denitration means) 52A, 52B, 52C, 52D, 54A, 54B, 5
4C, 54D valves (storage chamber switching means) 56A, 56B, 56C, 56D, 58A, 58B, 5
8C, 58D valve (circulation switching means) 66 adsorbent cartridge 68 cartridge transport path 70A, 70B, 70C, 70D cartridge inlet / outlet 71, 72 door 74 cartridge storage space 82 top wall 83 side wall 84 bottom wall 86, 87, 88 wire net 89 gas Communication space 90 Opening 91 First adsorbent 92 Second adsorbent 100, 104 Gas communication port 102 Mounting plate 108 Sealing material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Taminari Sakai 2-3-1 Shinhama, Arai-cho, Takasago-shi, Hyogo Prefecture Takasago Works, Kobe Steel, Ltd. (72) Norio Yanagiuchi 2 Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture 3-3-1 Kobe Steel Co., Ltd. Takasago Works (72) Inventor Tokuo Kaku 2-33-1 Niihama, Arai-cho, Takasago-shi, Hyogo Kobe Steel Works Takasago Works

Claims (14)

[Claims] 1. An adsorbent storage chamber which stores an adsorbent and into which a mixed gas containing nitrogen oxides is introduced during an adsorption step, and a gas introduction passage for introducing the mixed gas into the adsorbent storage chamber, In a nitrogen oxide removing device having a gas outlet passage for leading out a treated gas from which the nitrogen oxides have been adsorbed and removed in the adsorbent storage chamber, a device for removing nitrogen oxides, wherein the adsorbent has a predetermined size other than a bottom surface. The adsorbent is filled in an adsorbent cartridge having an outer wall shaped to communicate with the outside by a surface and to block all surfaces other than the predetermined surface, and the bottom surface of the adsorbent cartridge has an opening communicating with the adsorbent in the cartridge. On the other hand, a mounting portion for the adsorbent cartridge is provided on the floor of the adsorbent storage chamber, and a gas communicating with the opening below the adsorbent storage chamber is provided at a position corresponding to the opening in the mounting portion. Communication port One of the gas introduction passage and the gas discharge passage is disposed below the adsorbent storage chamber and connected to the gas communication port, and either one of the gas communication port and the opening is provided. A nitrogen oxide, characterized in that a seal member for sealing the gas communication port and the opening by providing a pressure contact with the peripheral surface of the other side due to the own weight of the adsorbent cartridge mounted on the mounting portion is provided around the nitrogen oxide. Removal device. 2. The nitrogen oxide removing apparatus according to claim 1, wherein a net having a finer mesh than that of the adsorbent is provided on a predetermined surface of the adsorbent cartridge, and the adsorbent is filled inside the net. Equipment for removing nitrogen oxides. 3. The nitrogen oxide removing apparatus according to claim 1 or 2, wherein a gas introduction passage is connected to a side wall of the adsorbent storage chamber, and a gas outlet passage is connected to the gas communication port. Nitrogen oxide removing device. 4. The nitrogen oxide removing apparatus according to claim 3, wherein the adsorbent cartridge is an outer wall having a side surface that allows the adsorbent to communicate with the outside. 5. The nitrogen oxide removing apparatus according to claim 4, wherein the adsorbent cartridge has a shape having four side surfaces, and a pair of surfaces facing each other are surfaces for communicating the adsorbent to the outside. It is characterized in that an adsorbent layer is formed immediately inside these surfaces, the outer surface of the other cartridge is covered with an outer wall, and a gas communication space communicating with the opening is formed between both adsorbent layers. Nitrogen oxide removal device. 6. The nitrogen oxide removing apparatus according to claim 4, wherein the adsorbent cartridge is formed in a cylindrical shape, and the outer peripheral surface of the adsorbent cartridge is used as a surface for communicating with the outside. An apparatus for removing nitrogen oxides, characterized in that an agent layer is formed, an upper surface of the cartridge is covered with an outer wall, and a gas communication space communicating with the opening is formed radially inward of the adsorbent layer. 7. The nitrogen oxide removing apparatus according to claim 1, wherein a plurality of adsorbent layers made of different adsorbents are laminated in the adsorbent cartridge. Oxide removal device. 8. The nitrogen oxide removing apparatus according to any one of claims 1 to 7, wherein a cartridge storage space is arranged beside the adsorbent storage chamber, and the cartridge storage space and the adsorbent storage chamber are arranged. A nitrogen oxide removing device, characterized in that a cartridge inlet / outlet communicating with the cartridge is provided on the side wall of the adsorbent storage chamber, and an opening / closing means for opening / closing the cartridge inlet / outlet is provided. 9. The nitrogen oxide removing apparatus according to claim 1, wherein the adsorbent storage chamber is divided into a plurality of parts, and each adsorbent storage chamber is provided with the gas introduction passage and the gas discharge passage. Storage chamber switching means for switching between a communication state in which the storage chamber switching means is connected to each of the adsorption chambers, and a storage state switching means for switching between a communication state in which the storage chamber switching means is switched to a shut-off state in which the gas introduction passage and the gas discharge passage are shut off. A gas circulation passage for circulating the gas desorbed from the adsorbent in the adsorbent storage chamber, a denitration means for denitrifying the circulating gas provided in the middle of the gas circulation passage, the gas circulation passage and the adsorbent storage chamber. An apparatus for removing nitrogen oxides, comprising: a circulation switching means for switching between a state of communicating with and a state of disconnecting. 10. The apparatus for removing nitrogen oxides according to claim 9, wherein a plurality of adsorbent storage chambers are arranged in a direction substantially equal to a horizontal direction orthogonal to the gas introduction direction, and the adsorbent storage chambers have a common structure. A nitrogen oxide removing device, characterized in that a gas introduction passage and a gas discharge passage are connected. 11. The apparatus for removing nitrogen oxides according to claim 10, wherein a common cartridge storage space is arranged beside each adsorbent storage chamber, and the cartridge storage space and each adsorbent storage chamber are communicated with each other. A nitrogen oxide removing device, characterized in that a cartridge inlet / outlet is provided on a side wall of each adsorbent storage chamber, and an opening / closing means for individually opening / closing each cartridge inlet / outlet is provided. 12. The nitrogen oxide removing apparatus according to claim 8 or 11, wherein the cartridge storage space is connected to a gas communication port of the adsorbent storage chamber of the gas introduction passage and the gas discharge passage. A nitrogen oxide removing device, which is arranged at a position directly above a passage. 13. The apparatus for removing nitrogen oxides according to claim 8, 11 or 12, wherein a cartridge transfer path is provided at the center of the floor of each adsorbent storage chamber, the cartridge transfer path continuing to the cartridge inlet / outlet, and on both left and right sides of the cartridge transfer path. A device for removing nitrogen oxides, characterized in that an adsorbent cartridge and a mounting portion thereof are arranged at a position. 14. The nitrogen oxide removing apparatus according to claim 1, wherein a dust collector for removing dust in the mixed gas is provided in the gas introduction passage. Oxide removal device.