JP2942567B2 - Cylindrical moving bed gas treatment apparatus and exhaust gas desulfurization and denitration apparatus using the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical moving bed gas treatment apparatus having an improved structure suitable for contact treatment between solid and gas, and an exhaust gas desulfurization and denitration apparatus using the same. More particularly, the present invention relates to a large-sized cylindrical moving bed gas treatment apparatus and an exhaust gas desulfurization and denitration apparatus using the same.

[Conventional technology]

Conventionally, for catalytic reaction between solid catalyst and gas or SOx, N
A moving bed type gas treatment system is used to adsorb and remove harmful substances from Ox, dust and other gases containing harmful substances. Have been.

When a large amount of processing gas is used in these gas processing apparatuses, a plurality of moving beds are generally combined to form a large box-type gas processing apparatus as shown in FIG.

However, in the box type gas processing apparatus as shown in FIG. 7, since the outer case is formed of a flat surface, it is necessary to put a large amount of reinforcing members vertically and horizontally in terms of pressure resistance. It requires a large number of members, such as a member to prevent the shogi from falling down, and furthermore, the thermal expansion due to fluctuations in the processing gas temperature and the thermal stress act in a complicated manner, resulting in a complex design. there were.

The filler is supplied to each moving bed by a pipe from a hopper provided above or by installing a horizontal transport conveyor above the moving bed.

However, in the case of a filler containing particles having different sizes, a bias occurs in the pipe, and since the filler is supplied as it is into the moving bed, the particles in the moving bed are biased substantially along the direction of the pipe.

If the uneven distribution of the particles coincides with the flow direction of the gas, there is no major problem, but if not, it is not preferable because the gas will drift.

Further, in order to make the amount of gas passing through each moving bed uniform, it is desirable that the moving distance of the gas from the gas inlet to the outlet be substantially equal for the gas passing through each moving bed. It is necessary to provide a partition in the gas passage for each row, and the structure of the apparatus becomes complicated.

As a solution to the above problem, there is a cylindrical gas processing apparatus as shown in FIG.

In this apparatus, the structure is simpler than in the box-type gas processing apparatus, and there are no problems in strength design and the number of members used is small. Further, by disposing a filler hopper at the center of the cylinder, the uneven distribution direction of the filler particles and the gas flow can be matched. Thus the eighth
Although the cylindrical device shown in the figure has many advantages as compared with the box type device shown in FIG. 7, it still has the following problems.

[Problems to be solved by the invention]

In the cylindrical gas processing apparatus shown in FIG. 8, the cylindrical filler moving bed is divided into several moving beds in order to make the supply of the filler or the movement in the moving bed as uniform as possible. In this case, since each unit moving layer has a fan-shaped cross section, it is difficult to make the descending speed of the filler uniform, and it is difficult to manufacture and assemble. Also, since there is no belt conveyor that has a large diameter and moves circumferentially, in order to collect the filler taken out from each moving bed in one place, a feeder is installed at the filler outlet of each moving bed, and filling is performed. The method of collecting materials at the center of the cylinder is common, but in this case, there is a problem that the number of feeders increases because the same number of feeders as each filler outlet is required.

Further, since the used filler transfer equipment occupies almost the entire floor surface inside the cylinder, the internal space cannot be effectively utilized.

For this reason, there was a problem that it could not be adopted for a large gas processing device.

The present invention solves the above-mentioned problems of the conventional device, and is particularly suitable for a large-sized apparatus, and aims to make the descending speed of the filler uniform, to facilitate manufacture and assembly, It is an object of the present invention to provide a cylindrical moving bed gas treatment apparatus capable of reducing the number of feeders for transporting a taken-out filler material and making the entire apparatus inexpensive, and an exhaust gas desulfurization and denitration apparatus using the same.

[Means for solving the problem]

The apparatus of the present invention is a double polygonal cylinder by arranging a plurality of moving layer units having a rectangular cross section continuously through an articulation portion between the inner and outer cylinders of a vertical double cylinder composed of concentric inner and outer cylinders. The upper and lower ends of the inner and outer cylinders are sealed while leaving a filler supply port at the upper part of the moving bed unit and a filler outlet at the lower part of the moving bed unit to form a filler moving bed group. That the outer gas passage is provided between the inner tube and the outer gas passage, the inner gas passage is provided between the filler moving layer group and the inner tube, and the gas inlet is connected to one of the outer gas passage and the inner gas passage and the gas outlet is connected to the other. A cylindrical moving bed gas processing apparatus, wherein the moving bed unit has a filler supply port at an upper portion and a filler outlet at a lower portion, and forms opposed long sides of a rectangular cross section of the moving bed unit. The wall to be made has a ventilation structure such as a looper,
A cylindrical moving bed gas, which is a moving bed unit having a rectangular cross section, in which the filler moves downward from above by making the short side an airtight structure, and the gas passes across the moving bed of the filler. It relates to a processing device.

In a preferred embodiment of the above device, a gas inlet or outlet is provided at one place of the outer cylinder, and two vertical shielding plates are inserted into the outer gas passage of the portion at an interval capable of forming a gas passage, and the portion is filled. A gas passage from the outside of the outer cylinder to the inner gas passage is formed by cutting out the material moving layer group, and this gas passage is connected to the outer cylinder at a position symmetrical with respect to the central axis of the cylinder and another gas inflow or outflow port is provided. In another preferred embodiment, the cylindrical moving bed gas treatment apparatus according to the above embodiment is provided with a heating and regeneration of a carbonaceous adsorbent installed inside the gas treatment apparatus. Device, a carbonaceous adsorbent hopper installed above the heating / regenerating device, a carbonaceous adsorbent supply pipe connecting the hopper and the filler supply port of each filler moving layer, and a carbonaceous adsorbent hopper disposed below the filler outlet. , From the filler outlet The conveyor and regenerated adsorbent spent adsorbent collected transferring the heated reproducing apparatus is a flue gas desulfurization and denitration apparatus including a conveyor for transporting the carbonaceous adsorbent hopper.

(Example of the invention)

Hereinafter, a cylindrical moving bed gas treatment apparatus of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a cylindrical moving bed gas treatment apparatus according to the present invention has a plurality of cross sections between an outer cylinder 1 and an inner cylinder 2 of concentric vertical double cylinders. The rectangular moving bed unit 4 is continuously arranged via the articulation portion 5 to form a double polygonal tubular packing moving bed group, and the filler supply port 12 at the upper part of the moving bed unit and the lower part at the lower part of the moving bed unit. By sealing the upper and lower ends of the inner and outer cylinders with the upper plate 10 and the lower plate 11 while leaving the filler outlet 13, the outer gas passage 8 is moved between the filler moving layer group and the outer cylinder 1 to move the filler. An inner gas passage 9 is provided between the layer group and the inner cylinder 2, a gas inlet 6 is provided on one of the outer gas passage 8 and the inner gas passage 9, and a gas outlet 7 is provided on the other.
Are connected.

1 and 2, a gas inlet 6 is provided in the inner gas passage,
Although the example in which the gas outlet 7 is connected to the outer gas passage is shown, the opposite may be applied.

In the present apparatus, the moving bed unit 4 is provided with a filler supply port 12 at an upper part and a filler outlet 13 at a lower part as shown in FIG. The wall 14 forming the long side is formed as an air-permeable structure such as a looper, and the wall 15 forming the short side is formed as an airtight structure.

With the above structure, the filler moves from above to below, and the gas passes across the moving layer of the filler. In addition, if the filler supplied from one filler supply port 12 spreads too much, the flow of the filler becomes uneven, so the moving bed unit is divided into several sections, and the filler supply is performed for each section. Preferably, a port 12 and a filler outlet 13 are provided.

A partition may be provided for each section. However, since the filler usually moves between a pair of supply ports and an outlet, it is not particularly necessary to provide a partition.

In the apparatus of the present invention, a plurality of the moving bed units are continuously arranged via an airtight joint 5 as shown in FIGS. A double polygonal cylindrical filler-moving layer group is formed so as to make a round of the space. In this case, it is preferable to arrange the moving layer units such that the midpoint of the long side of the cross section is orthogonal to the radius of the double cylinder.

In addition, the size, number, and shape, size, and the like of the moving bed units may be appropriately determined in consideration of the arrangement conditions, the entire gas processing amount, and the like. Considering the easiness of designing the transfer equipment for the filler taken out from the outlet, etc., it is preferable to use eight.

The gas inlet and outlet can be installed in any position and in any shape according to the installation conditions of the processing equipment.
As an example of a preferred embodiment, as shown in FIG. 4, a gas outflow / inflow path 17 is provided at one location of the outer cylinder 1 and two vertical A gas flow path from the outside of the outer cylinder to the inside gas passage is formed by inserting the shielding plate 18 and notching the filler moving layer group in the relevant portion, and this gas passage is symmetric with respect to the central axis of the cylinder. Another gas outflow / inflow path is installed in the outer cylinder at an appropriate position.

In the above aspect, the notch is preferably a portion corresponding to the joint of the filler moving layer group, the gas inlet is preferably installed below the middle of the outer cylinder, and the gas outlet is preferably installed above the middle.

The cylindrical moving bed gas treatment apparatus of the present invention, as a catalytic reactor by using various catalysts as a filler,
By using an adsorbent such as zeolite or a carbonaceous substance as a filler, it can be used as an adsorption treatment device.

Among them, a carbonaceous adsorbent such as activated coke and activated carbon is used, and is suitable as a device for adsorbing and removing SOx from a gas containing SOx such as combustion exhaust gas.

Also, by adding an ammonia addition device, SOx
As a device that simultaneously removes SOx and NOx from gas containing NOx and NOx, a partition is further provided in the inner gas passage or the outer gas passage, and the number of times the gas crosses the moving bed increases the number of different processes such as desulfurization and denitration. It can also be used as an apparatus for performing

Next, an exhaust gas desulfurization and denitration apparatus using the cylindrical moving bed gas treatment apparatus as an adsorption treatment section will be described with reference to FIGS.
This will be described with reference to the drawings.

The adsorption processing section constituting the main part of the present apparatus is a cylindrical moving bed gas processing apparatus using a carbonaceous adsorbent as a filler.

That is, the adsorbent moving layer unit 54 having a rectangular cross section is continuously arranged between the outer cylinder 51 and the inner cylinder 52 which are concentric cylinders via the articulation portion 55, and the adsorbent supply port 65 is provided at the upper part and the adsorbent supply port 65 is provided at the lower part. The upper plate 61 and the lower plate 62 form a sealed structure while leaving the adsorbent outlet 66, and a gas inlet 56 is provided at the lower part of the outer cylinder 51, at which portion the outer gas passage 58 is cut off by the shield plate 60 and the adsorbent moves. By cutting out the joints of the layer group, the inner gas passage 59
Forming a gas passage leading to the The gas outlet 57 is provided on the upper portion of the outer cylinder at a position symmetrical with respect to the center axis of the gas flow path and the cylinder.

The supply of the adsorbent to each adsorbent moving bed is performed by the adsorbent supply pipe 64 from the adsorbent hopper 63 installed above the center of the cylinder.
Performed by

A conveyor group for collecting used adsorbents below the adsorbent outlet 66 and transferring the collected adsorbents to a used adsorbent hopper 70 attached to a heating / regenerating device 71 installed in a gap inside the inner cylinder. 67 are provided.

An example of removing SOx and NOx from an exhaust gas containing SOx and NOx using the exhaust gas desulfurization and denitration apparatus shown in FIGS. 5 and 6 and using activated coke as an adsorbent will be described below.

After the ammonia gas is added to the exhaust gas just before the gas inlet, the gas enters the inner gas passage 59 through the gas inlet 56, and the activated coke moves from above to below.
54 cross-flow, and contact with activated coke
After removing x and NOx, the gas exits to the outside gas passage 58
It is discharged outside the system through 57.

On the other hand, activated coke is supplied from the upper adsorbent hopper 63,
It is supplied to each adsorbent moving bed via adsorbent supply pipe 64,
The activated coke, which has moved in the moving bed from above to below and has adsorbed SOx, is taken out from the adsorbent outlet 66 of the moving bed stock.

The moving speed in the moving bed is adjusted by means such as providing a measuring and cutting device at the adsorbent outlet, but it can be easily controlled by adjusting the shape of the outlet and the moving speed of the belt conveyor.

Activated coke adsorbing SOx exiting the outlet is collected by a belt conveyor 67 and a belt conveyor 68 connected to each of the moving bed adsorption units, and then collected in a used adsorbent hopper 70, and the inner cylinder. It is heated and regenerated by a heating and regenerating device installed in the inner space.

The regenerated activated coke is replenished with new activated coke from the replenishing new adsorbent hopper 72 if necessary, and sent to the adsorbent hopper again.

The activated coke used in this process has a large or small particle size due to abrasion due to its production process or repeated use, and uneven distribution of particles occurs in the adsorbent supply pipe, and the activated coke is supplied to the moving bed as it is. However, in the present apparatus, since all the pipes are arranged substantially at right angles to the adsorbent moving bed unit, the uneven distribution direction of the particles in the moving bed becomes the same as the gas flow direction, so that the gas drift occurs. There is no fear.

〔The invention's effect〕

As described above, the apparatus of the present invention is a large-sized apparatus particularly suitable for various types of gas processing using a gas or solid catalyst, and has the following advantages.

1) Since the outer shell is formed in a cylindrical shape, the strength can be easily designed as compared with the conventional box-type device, and the number of reinforcing members may be reduced.

2) The outer frame of the apparatus is cylindrical, but each moving bed unit has a rectangular cross section, making it easier to equalize the descending speed of the filler compared to the fan-shaped moving bed in the conventional cylindrical apparatus. Also, it is easy to manufacture and assemble the device.

3) When viewed as a whole, each moving bed unit is linear, and these are arranged in a polygonal shape, so that the filler coming out of each moving bed can be collected at an arbitrary position by a combination of ordinary conveyors.

4) Therefore, it is not necessary to collect the used filler at the center of the cylinder, as is usually done in a conventional cylindrical device, so that the space inside the cylinder can be effectively reduced by installing a filler regeneration device. Available.

5) In a cylindrical device, in order to connect the inner gas passage with the external piping, it is necessary to pass an appropriate pipe through the upper part of the filler moving device group or to pass the lower part thereof. Since many pipes for supplying the filler from the hopper pass through, and a plurality of feeders and the like for transferring the filler are provided below, a complicated structure is likely to be formed. In addition, if the gas passage is formed by partially cutting out the outer gas passage and the moving layer group, it is only necessary to provide a nozzle on the side of the outer cylinder, and the structure can be made extremely simple.

6) By arranging the gas inlet and outlet at symmetrical positions with respect to the center of the cylinder, the amount of gas passing through each moving bed is equal because the gas passing through any part of the packing moving bed travels the same distance in the apparatus. Can be kept uniform.

Therefore, the present invention has an effect that it is particularly suitable for a large-sized cylindrical moving bed gas treatment apparatus and an exhaust gas desulfurization and denitration apparatus using the same.

[Brief description of the drawings]

1 and 2 are a partially simplified plan view and a side view, respectively, of a cylindrical moving bed gas treatment apparatus of the present invention. FIG. 3 is a sketch showing the details of the moving bed unit. FIG. 4 is a sketch showing the details of the notch in FIGS. FIG. 5 and FIG. 6 are a plan view and a side view, respectively, showing the outline of the desulfurization and denitration apparatus of the present invention in a partially simplified manner and with different cuts. FIGS. 7 and 8 are schematic views of a conventional box type gas processing apparatus and a cylindrical gas processing apparatus, respectively.
Is a plan view, (b) is a side view, and an arrow represents a gas flow direction. 1, 51 ... outer cylinder 2, 52 ... inner cylinder 4 ... moving bed unit 5 ... articulation section 6, 56 ... gas inlet 7, 57 ... gas outlet 8, 58 ... outer gas passage 9, 59 Inner gas passage 12 Filler supply port 13 Filler outlet 17 Gas outflow / inlet passage 18, 60 Shielding plate 54 Adsorbent moving bed unit 61 Upper plate 62 Lower plate 63 ... Adsorbent hopper 64 ... Adsorbent supply piping 65 ... Adsorbent supply port 66 ... Adsorbent outlet 67, 68 ... Conveyor 70 ... Used adsorbent hopper 71 ... 72 …… New adsorbent hopper for replenishment

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 53/94

Claims (3)

(57) [Claims] 1. A double polygonal cylinder having a plurality of moving layer units having a rectangular cross section continuously disposed between an inner cylinder and an outer cylinder of a vertical double cylinder composed of concentric inner cylinders via an articulation portion. The upper and lower ends of the inner and outer cylinders are sealed by leaving a filler supply port at the upper part of the moving bed unit and a filler outlet at the lower part of the moving bed unit, thereby forming the filler moving bed group and the outer cylinder. An outer gas passage is provided between the packing material moving layer group and the inner cylinder, and an inner gas passage is provided.A gas inlet is provided in one of the outer gas passage and the inner gas passage, and a gas outlet is provided in the other. A cylindrical moving bed gas processing apparatus, characterized in that the moving bed unit is provided with a filler supply port at an upper portion and a filler outlet at a lower portion, and has a rectangular cross section of the moving bed unit opposed to each other. The wall forming the long side has a breathable structure such as a looper, The cylindrical moving bed gas treatment is a moving bed unit with a rectangular cross section, in which the packing moves from top to bottom by making the sides airtight, and the gas passes across the moving bed of packing. apparatus. 2. A gas inflow or outflow port is provided at one location of an outer cylinder, and two vertical shielding plates are inserted at an interval capable of forming a gas passage in an outer gas passage of the portion, and a filler is moved in the portion. By cutting out the layer group, a gas passage from the outside of the outer cylinder to the inside gas passage is formed, and another gas inflow or outflow port is provided in the outer cylinder at a position symmetrical with respect to the cylinder central axis with this gas passage. The cylindrical moving bed gas treatment apparatus according to claim 1, wherein: 3. A cylindrical moving bed gas treatment apparatus according to claim 2, a heating apparatus for heating a carbonaceous adsorbent installed inside said gas processing apparatus, and a carbonaceous apparatus installed above said heating and regeneration apparatus. An adsorbent hopper, a carbonaceous adsorbent supply pipe connecting the hopper and the filler supply port of each filler moving layer, and disposed below the filler outlet to collect used adsorbents from the filler outlet. An exhaust gas desulfurization and denitration apparatus including a conveyor for transferring to a heating and regenerating device and a conveyor for transferring regenerated adsorbent to a carbonaceous adsorbent hopper.