JPH02211212A - Cylindrical moving bed gas treatment apparatus and exhaust gas desulfurization and denitration apparatus using the same - Google Patents

Abstract

PURPOSE:To uniformize the amount of gas by mounting packing material supply and taking-out ports to the respective upper and lower parts of a moving bed unit and forming the long side of wall into an air permeable structure and the short side thereof into an airtight structure. CONSTITUTION:Waste gas receives the addition of ammonia gas on this side of a gas inlet to enter an inside gas passage 59 from the gas inlet 56 and passes through an adsorbing material moving bed unit 54, wherein activated coke moves from above to below as an orthogonal stream and, after COx and NOx in the gas are removed by the contact with activated coke, the treated gas issues to an outside gas passage 58 to be discharged out of the system through a gas outlet 57. Activated coke is supplied to the adsorbing material moving bed from an adsorbing material hopper 63 through adsorbing material supply piping 64 to move from above to below in the moving bed and the activated coke having adsorbed SOx is taken out from the adsorbing material taking-out port 66 of the moving bed. By this method, the uniformization of the falling of a packing material becomes easy.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a cylindrical moving bed gas treatment device having an improved structure suitable for contact treatment of solids and gases, and an exhaust gas desulfurization and denitrification device using the same. .

[Conventional technology]

Conventionally, Rui Box for contact reaction between solid catalyst and gas
As a device for adsorbing and removing harmful substances from gases containing NOx 1 dust and other harmful substances, there is a moving bed type gas treatment device in which the gas is passed in a cross flow through a moving bed in which a filler moves from above to below. It is used. When the amount of gas to be processed is large in these gas processing apparatuses, it is common to combine a plurality of moving layers to form a large box-shaped gas processing apparatus as shown in FIG.

However, in the box-shaped gas treatment equipment shown in Figure 7, since the outer case is constructed of a flat surface, it is necessary to insert a large amount of reinforcing members vertically and horizontally in order to withstand pressure. It requires a large amount of parts, such as parts to prevent the player from falling over like a chess player, and
There were many drawbacks, such as a complicated design at the end due to the complex effects of thermal expansion and thermal stress due to fluctuations in processing gas temperature.

In addition, the filler is supplied to each moving bed by piping 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 of different sizes, a biased V occurs in the pipe, and since the filler is supplied as is into the moving bed, the particles in the moving bed are biased approximately 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 it does not, the gas will flow unevenly, which is not preferable. Furthermore, in order to make the amount of gas passing through each moving layer uniform, it is desirable to make the moving distance of the gas from the gas inlet to the outlet approximately equal for the gas passing through each moving layer. It is necessary to provide a partition wall in each gas passage for each row, which poses a problem in that the structure of the device becomes complicated.

There is a cylindrical gas treatment device as shown in FIG. 8 that solves the above problem. This device has a simpler structure than the box-type gas treatment device, has fewer problems in terms of strength design, and uses fewer members. Also,
By installing the filler hopper at the center of the circular node, the uneven distribution direction of the filler particles can also be made to match the gas flow direction. Although the cylindrical device shown in FIG. 8 has many advantages over the box-shaped device shown in FIG. 7, it still has the following problems.

[Problem to be solved by the invention]

In the cylindrical filler moving bed 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 within the moving bed as uniform as possible. In this case, each unit moving layer has a fan-shaped cross section, so it is difficult to equalize the descending speed of the filler, and the manufacturing and
It is also difficult to assemble. In addition, 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 a feeder is installed at the filling material outlet of each moving bed. Generally, the material is collected in the center of the cylinder, but in this case, the same number of feeders as each filler outlet are required, so there is a problem that the number of feeders increases. Furthermore, the equipment for transferring these used fillers occupies almost the entire floor surface inside the cylinder, making it impossible to make effective use of the internal space.

[Means to solve the problem]

The device of the present invention has a double polygonal cylinder by continuously arranging a plurality of moving bed units each having a rectangular cross section via a connecting part between the inner and outer cylinders of a vertical double cylinder consisting of concentric inner and outer cylinders. By forming a filler moving bed group in the form of a shape, and sealing the upper and lower ends of the inner and outer cylinders, leaving a filler supply port at the top and a filler outlet at the bottom of the moving bed unit, the filler moving bed group and the outside are sealed. An outer gas passage is provided between the cylinder and the cylinder, an inner gas passage is provided between the filler moving bed group and the cylinder, a gas inlet is connected to one of the outer gas passage and the inner gas passage, and a gas outlet is connected to the other. A cylindrical moving bed gas treatment apparatus characterized in that the moving bed unit has a filler supply port in the upper part and a filler outlet in the lower part, and the opposing long sides of the rectangular cross section of the M# moving bed unit The walls that form the walls are made of breathable structures such as louvers,
Conical moving skin, which is a moving bed unit with a rectangular cross section, whose short sides are airtight so that the filling material moves from the top to the bottom and gas passes across the moving bed of the filling material. It relates to a gas treatment device.

In a preferred embodiment of the above device, a gas inflow or outflow port is provided at one location of the outer cylinder, two vertical shielding plates are inserted at an interval that allows a gas passage to be formed in the outer gas passage of that part, and the part is filled. By cutting out the material movement layer group, a gas passage is formed from the outside of the outer cylinder to the inside gas passage, and this gas passage is connected to another gas inflow or outflow port in the outer cylinder at a position symmetrical to the cylinder center axis. 65, and another preferred embodiment is a cylindrical moving bed gas treatment apparatus according to the above embodiment, in which heating regeneration of the carbonaceous adsorbent installed inside the gas treatment apparatus is provided. equipment, a carbonaceous adsorbent hopper installed above the heating regeneration device, a carbonaceous adsorbent supply pipe connecting the hopper and the filler supply port of each filler moving bed, and a carbonaceous adsorbent supply pipe installed below the filler outlet. This is an exhaust gas desulfurization and denitrification device that is equipped with a conveyor that collects used adsorbent discharged from the filler outlet and transfers it to a heating regeneration device, and a conveyor that transfers the regenerated adsorbent to a carbon adsorbent hopper.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cylindrical moving bed gas treatment apparatus of the present invention will be described below with reference to the drawings.

The cylindrical moving bed gas treatment apparatus of the present invention has a plurality of concentric vertical double cylinders between the outer f#i1 and the inner cylinder 2, as shown in specific examples in FIGS. 1 and 2. A double polygonal cylindrical filler moving bed group is formed by continuously arranging the moving bed units 4 having a rectangular cross section through the connecting portions 5, and the filler supply port 12 at the upper part of the moving bed unit 4, By sealing the upper and lower ends of the inner and outer cylinders from the upper plate 1o and the lower plate 1mK, leaving the lower filler outlet 13t, an outer gas passage 8 is created between the filler moving layer group and the outer cylinder. An inner gas passage 9 is provided between the filler moving bed group and the inner chamber, and a gas inlet is connected to one of the outer gas passage and the inner gas passage, and a gas outlet is connected to the other. Note that FIG. 1.2 shows an example in which the gas port 6 is connected to the inner gas passage and the gas outlet lower is connected to the outer gas passage. In this apparatus, as shown in FIG. 5, the moving bed unit 4 is equipped with a filler supply port 12 in the upper part and a filler outlet 13 in the lower part. The wall 14 forming the long side of
The wall 15 forming the short side has an airtight structure.

With the above structure, the filling material moves from the top to the bottom, and the gas passes across the moving layer of the filling material. In addition, if the filler supplied from one filler supply port spreads too much laterally, the flow of the filler will become uneven, so the moving bed unit is divided into several sections, and each section has a filler supply port. It is preferable to provide a filler outlet and a filler outlet. Although a partition wall may be provided for each section, it is not necessary to provide a partition wall because the filling material is normally moved between a pair of supply ports and a take-out port.

In the apparatus of the present invention, a plurality of moving bed units are arranged continuously through airtight joints 5 as shown in Fig. 1.2, and are arranged between the inner and outer cylinders of a vertical double cylinder. A double polygonal cylindrical filler moving layer group is formed so as to go around the space. In this case, each moving layer unit is preferably arranged so that the midpoint of the long side of the cross section is perpendicular to the radius of the double cylinder.

In addition, the size and number of the moving bed units and the shape and size of the articulated parts may be determined as appropriate by taking into account the installation conditions, the overall gas throughput, etc., but the distance between the inner and outer cylinders and the filler In consideration of the ease of designing a transfer facility for the filling material taken out from the take-out port, it is preferable to set the number to eight. The gas inlet and outlet can be installed at any position and in any shape depending on the installation conditions of the processing device, but as an example of a preferred embodiment, they are installed at one location on the outer cylinder 1 as shown in FIG. A gas inlet/outlet passage 17 is provided in the outer gas passage 8 in that part.
A gas flow path leading from the outside of the outer cylinder to the inner gas passage is formed by inserting two vertical shielding plates 18 at intervals that allow the formation of a gas flow path, and by cutting out the filler moving layer group in this portion. Another gas inflow and outflow path is installed in the outer cylinder at a position symmetrical to this gas flow path with respect to the central axis of the cylinder. In the above aspect, it is preferable that the notch corresponds to a joint part of the group of moving filler layers, that the gas inlet is installed below the middle of the outer cylinder, and the gas outlet is installed above the middle.

The cylindrical moving bed gas treatment device of the present invention can be used as a catalytic reaction device by using various free catalysts as a filler, and can be used as an adsorption treatment device by using an adsorbent such as zeolite or charcoal-wood material as a filler. can be used. Among these, it is suitable as an apparatus for adsorbing and removing Box from Box-containing gas such as combustion exhaust gas using a carbonaceous adsorbent such as activated coke and activated carbon. In addition, by adding an ammonia addition device, Boz and NOx
As a device that simultaneously removes Box and NOx from a gas containing It can also be used as a device for

Next, an exhaust gas desulfurization and denitrification apparatus using the cylindrical moving bed gas treatment apparatus as an adsorption treatment section will be described with reference to FIGS. 5 and 6.

The adsorption processing section constituting the main part of this apparatus uses a carbonaceous adsorbent as a filler in the cylindrical moving bed gas processing apparatus. That is, an adsorbent moving bed unit 54 having a rectangular cross section is continuously arranged between an outer cylinder 51 and an inner cylinder 52, which are concentric cylinders, via a connecting part 55'jk, with an adsorbent supply port 65 at the top and an adsorbent supply port 65 at the bottom. The upper plate 61 and the lower plate 62 form a sealed structure, leaving an adsorbent outlet 66 in the outer cylinder 51.
A gas passage 56 is provided at the lower part of the gas passage 56, and a gas passage leading to an inner gas passage 59 is formed by cutting off the outer gas passage 58 at that part with a shielding plate 60 and cutting out the connecting part of the adsorbent moving layer group. do. The gas outlet 57 is provided at the upper part of the outer cylinder at a position symmetrical with respect to the gas flow path and the central axis of the cylinder.

The adsorbent is supplied to each adsorbent moving layer from an adsorbent hopper 63 installed above the center of the cylinder to an adsorbent supply pipe 64.
This is done by In addition, a used adsorbent hopper 70 is installed below the adsorbent outlet 66 to collect the used adsorbent, and is attached to a heating regeneration device 71 installed in the cavity inside the inner cylinder.
A group of conveyors 67 is provided for conveying to.

The exhaust gas desulfurization and denitrification equipment t' shown in Figure 5.6 is used below, activated coke is used as an adsorbent, and BOX and NOx are removed.
f: An example of removing Box and NOx from the contained exhaust gas will be described.

Ammonia gas is added to the exhaust gas before the gas inlet, and then it enters the inner gas passage 59 from the gas inlet 56, and passes through the adsorbent moving bed (22) in a 54 ft cross flow, in which the activated coke moves from the upper side to the lower side. After Boz%NOX is removed by contact with activated coke, the outer gas passage 58
The gas exits through the gas outlet 57 and is discharged to the outside of the system.

-10,000, the activated coke comes from the upper adsorbent hopper 63,
The adsorbent is supplied to each adsorbent moving bed through the adsorbent supply piping 64, moves from above to below within the moving bed, and is transferred to Box ′ft:
The adsorbed activated coke is taken out from the adsorbent outlet 66 of the mobile stock increaser. The speed of movement within the moving bed is adjusted by means such as providing a metering and cutting device at the adsorbent outlet, but it can also be controlled simply by adjusting the shape of the outlet and the moving speed of the belt conveyor.

The adsorbed activated coke leaves the take-out port in 9 boxes and is transferred to a belt conveyor 67 installed in each moving bed adsorption unit.
After being collected by a nine-belt conveyor 68 connected thereto, it is caught in a used adsorbent hopper 70 and heated and regenerated by a heating regeneration device installed in the cavity inside the cylinder. The regenerated activated coke is replenished with new activated coke from a new replenishing adsorbent hot/<-72 as necessary.
It is sent to the adsorbent hopper again.

The activated coke used in this process varies in particle size from 9 to 9 due to wear due to its manufacturing process or repeated use, and the particles are unevenly distributed in the adsorbent supply pipe, so they are supplied as they are to the moving bed. However, in this device, each pipe is arranged almost at right angles to the adsorbent moving bed unit, so the direction of uneven distribution of particles in the moving bed is the same as the flow direction of the gas. There is no risk of drifting.

〔Effect of the invention〕

As explained above, the apparatus of the present invention is suitable for various gas treatments by contacting gases and solids, and has the following advantages.

1) Since the outer shell is cylindrical, the strength can be easily designed compared to conventional box-shaped devices, and fewer reinforcing members are required.

2) Although the outer frame of the device is cylindrical, each moving bed unit has a rectangular cross section, which makes it easier to equalize the falling speed of the filler compared to the fan-shaped moving bed in conventional cylindrical devices; Also, the device is easy to manufacture and assemble.

3) Overall, each moving bed unit has a linear shape, and since these units are arranged in a polygonal shape, the filling material discharged from each moving bed can be collected at an arbitrary position by a combination of ordinary conveyors.

4) Therefore, there is no need to collect the used filling material in the center of the cylinder as is normally done with conventional cylindrical devices, so it is possible to utilize the void inside the cylinder by installing a filling material recycling device. Available for

5) In a cylindrical device, in order to communicate between the inner gas passage and the external piping, it is necessary to pass an appropriate piping through the top or under the packing material moving bed group, but usually the upper part of the moving bed group The structure tends to be complicated because a large number of pipes for supplying the filler from the hopper pass therethrough, and a large number of feeders for transporting the filler are installed below. In contrast,
In one embodiment of the device of the present invention, if the outer gas passage and the moving layer group are partially cut out to form a gas passage,
It is sufficient to simply provide a nozzle on the side of the outer cylinder, resulting in an extremely simple structure.

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 layer is the same because the gas that passes through any part of the packing material moving bed travels the same distance within the device. can be kept uniform.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are respectively cylindrical shape IEI of the present invention.
FIG. 2 is a partially simplified plan view and side view of the I-layer gas treatment device. FIG. 3 is a diagram showing details of the mobile layer unit. FIG. 4 is a sketch showing details a of the notch in FIG. 1.2. FIG. 5 and FIG. 6 are a partially simplified plan view and a side view, respectively, showing an outline of the desulfurization and denitrification apparatus of the present invention, with different views. FIG. 7 and FIG. 8 are schematic diagrams of a conventional box-type gas treatment device and a cylindrical gas treatment device, respectively;
is a plan view, (b) is a side view, and the arrow indicates the direction of gas flow. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Inner cylinder, 4... Moving bed unit, 5... Articulating part, 6... Gas inlet, 7... Gas outlet, 8... Outer gas Passage, 9...Inner gas passage, 1
2... Filler supply port, 13... Filler outlet, 17
...Gas inflow and outflow passage, 18...Shiyahei plate, 51...
- Outer cylinder, 52... Inner cylinder, 54... Adsorbent moving bed unit, 56... Gas inlet, 57... Gas outlet, 58
...Outer gas passage, 59...Inner gas passage, 60.
... middle plate, 61... upper plate, 62... lower plate, 6
3... Adsorbent hopper 64... Adsorbent supply piping, 65... Adsorbent supply port, 66... Adsorbent outlet,
67.68... Conveyor, 70... Used adsorbent hopper 71... Heating regeneration device, 72... New adsorbent hopper for replenishment

Claims (3)

[Claims] (1) A double polygonal cylindrical shape is created by continuously arranging a plurality of moving bed units with rectangular cross-sections via joints between the inner and outer cylinders of a vertical double cylinder consisting of concentric inner and outer cylinders. By forming a filler moving bed group and sealing the upper and lower ends of the inner and outer cylinders, leaving a filler supply port at the top and a filler outlet at the bottom of the moving bed unit, the filler moving bed group and the outer cylinder are sealed. An outer gas passage is provided between the group of moving filler layers and the inner cylinder, and a gas inlet is connected to one of the outer gas passage and the inner gas passage, and a gas outlet is connected to the other. A cylindrical moving bed gas treatment apparatus characterized in that the moving bed unit is provided with a filler supply port at the top and a filler outlet at the bottom, forming opposite long sides of a rectangular cross section of the moving bed unit. By making the wall with a breathable structure such as a louver and the short side with an airtight structure, the filling material moves from the top to the bottom, and the gas passes across the moving layer of the filling material. , a cylindrical moving bed gas treatment device which is a moving bed unit with a rectangular cross section. (2) A gas inflow or outflow port is provided at one location on the outer cylinder, and two gas inflow or outflow ports are provided at an interval that allows a gas passage to be formed in the outer gas passage of that part.
A gas passage from the outside of the outer cylinder to the inside gas passage is formed by inserting two vertical shielding plates and cutting out the filler moving layer group in the relevant part, and this gas passage is 2. The cylindrical moving bed gas treatment device according to claim 1, further comprising another gas inlet or outlet provided in the outer cylinder at a symmetrical position. (3) A cylindrical moving bed gas treatment device according to claim 2, a heating regeneration device for a carbonaceous adsorbent installed inside the gas treatment device, and a carbonaceous adsorbent installed above the heating regeneration device. A hopper, a carbonaceous adsorbent supply pipe connecting the hopper and the filler supply port of each filler moving bed, and a heating regeneration device installed below the filler outlet to collect the used adsorbent from the filler outlet. an exhaust gas desulfurization and denitrification device including a conveyor for transferring the regenerated adsorbent to a carbonaceous adsorbent hopper;