JPS592833Y2 - Moving bed type denitrification equipment for sintering furnace exhaust gas - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a moving bed type denitrification device for sintering furnace exhaust gas.

Conventionally, a fixed bed method was generally used as a dry denitrification device for sintering furnace exhaust gas, but due to the nature of the dust contained in the exhaust gas, the dust adhered to the catalyst layer significantly.
Long-term continuous operation was difficult.

Therefore, in order to solve the above problem, a moving bed denitrification device was devised in which catalyst particles are moved through the exhaust gas flow path, but even in this moving bed method, the wire mesh that holds the catalyst is The phenomenon of dust adhering to the wire mesh located on the upstream side of the channel is unavoidable no matter what shape of wire mesh is used.As a result, pressure loss gradually increases during long-term operation, resulting in a reduction in the processing capacity of the denitrification equipment. becomes impossible to maintain.

In view of the above problem, the present invention improves the stable processing capacity of the moving bed denitrification equipment by providing a hammering device that hammers the wire mesh on the upstream side and removes the attached dust. Its feature is that it enables long-term operation under maintained conditions.

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. In Fig. 1, 1 is the main body of the denitrification equipment, which has an inlet 2 for the exhaust gas to be treated and an outlet 3 for the treated exhaust gas. In the center of the main body 1, there is formed a denitrification catalyst transfer path 5 that intersects and traverses the exhaust gas flow path 4 from the inlet 2 to the outlet 3, and a denitrification catalyst transfer path 5 is formed in the center of the main body 1. Appropriate wire meshes 6 and 7 capable of holding the catalyst and distributing the exhaust gas are installed on the upstream and downstream sides of the intersection with the exhaust gas flow path 4, respectively, and the upper and lower ends of the transfer path 5 is provided with a catalyst supply port 8 and a catalyst discharge port 9.

As is clear from FIGS. 2 and 3, the hammering device 10 for hammering the wire mesh 6 on the upstream side is rotatably supported by a bearing 12 on a support stand 11 on the side surface of the main body 1. A support arm 16 of a hammer 15 that collides with a seat 14 attached to a wire mesh 6 is fixed to one end of the shaft rod 13, and a large number of disc-shaped weights 17 are attached to the base of the shaft rod 13 so that they can be increased or decreased. A weight arm 18 is fixed, a cam follower 19 is formed at the other end of the weight arm 18, and the cam follower 19 is opposed to a cam 22 on a cam shaft 21 rotatably supported by a bearing 20. A sprocket 23 is fixed to the other end, and a chain 26 is wound between the sprocket 23 and a sprocket 25 of a motor 24 with a reduction gear disposed on the main body 1.

In the moving bed type denitrification apparatus having the above configuration, the exhaust gas that has flowed into the flow path 4 from the inlet 2 passes through the mesh of the wire mesh 6 on the upstream side and flows into the catalyst transfer path 5. While passing through the catalyst layer transferred downward in the channel 5, it comes into contact with the catalyst and undergoes denitrification treatment, passes through the wire mesh 7 on the downstream side into the channel 4 again, and flows out from the outlet 3.

At this time, when the exhaust gas flows into the transfer path 5 through the wire mesh 6 on the upstream side, a part of the dust contained in the exhaust gas is filtered by the wire mesh 6 and adheres to the surface thereof, and as the amount of dust attached increases. As a result, the pressure loss in the flow path 4 gradually increases.

Therefore, periodically or when the pressure loss reaches a certain value, the hammering device 1 is automatically or externally operated.
By operating 0, the attached dust can be removed.

That is, when the motor 24 is driven, the cam shaft 21 rotates via the chain 26, and the cam 22 fixed to one end of the cam shaft 22 rotates to push down the cam follower 19, causing the shaft rod 13 to rotate and the weight 17 and the hammer 15 to rotate. It is lifted up to the position indicated by the chain line shown in Figure 1.

Then, when the cam 22 rotates further and comes off the cam follower 19, the weight 17 descends from the chain line position due to its gravity, and at the same time, the hammer 15 also descends and applies an impact force corresponding to the weight of the weight 17 to the seat 14 of the wire mesh 6. collide with

At this time, the attached dust is peeled off due to the vibration of the wire mesh 6,
A part of it falls to the bottom of the apparatus and is discharged from a vibrating sieve (not shown), and the rest passes through the catalyst layer together with the exhaust gas and is discharged together with the gas to be treated.

In this way, the hammering device 10 is operated to remove the dust each time the amount of dust adhering to the wire mesh 6 increases, thereby allowing the device to operate continuously for a long period of time.

The impact force by the hammer 15 can be arbitrarily adjusted by increasing or decreasing the number of wafers 1 to 17.

FIG. 4 shows the results of an experiment conducted by the present inventors using a test device using actual gas from an incinerator.

As is clear from the figure, the initial pressure loss of the catalyst layer in the test device was about 4Q mmAq, but it was about 20Q mmAq.
After 0 hours, it started to rise rapidly.

Therefore, when the pressure loss reached approximately 5Q mmAq, hammering was performed while the denitration equipment continued to operate, and the pressure loss recovered to its initial value.

Note that there was no damage to the catalyst due to hammering.

From the results of this experiment, it is clear that by further increasing the frequency of hammering, the device can always be operated with the initial pressure loss (approximately 4 QmmAq).

As described above, according to the denitrification device of the present invention, since the hammering device is provided, the dust attached to the wire mesh can be removed extremely easily and reliably, and furthermore, the dust can be removed even during operation of the device. This method has excellent features such as being able to easily carry out the denitrification process each time the denitrification device is deposited, and therefore, the denitrification device can be operated continuously for a long period of time while stably maintaining the exhaust gas treatment capacity.

[Brief explanation of drawings]

Fig. 1 is a schematic vertical cross-sectional view of the denitrification device according to the present invention, Fig. 2 is an enlarged front view of its main parts, Fig. 3 is an enlarged side view of the main parts, and Fig. 4 is a line showing experimental results using a test device. It is a diagram. 1...Main body, 4...Exhaust gas flow path, 5.
... Catalyst transfer path, 6.7 ... Wire mesh, 10
... Hammering device, 15 ... Hammer.

Claims (1)

[Scope of utility model registration request] A flow path for the exhaust gas to be denitrified and a transfer path for the denitrification catalyst that intersects with the flow path for the exhaust gas to be denitrified are formed in the denitrification device main body, and a flow path for the exhaust gas is formed on the upstream and downstream sides of the exhaust gas at the intersection of the transfer path with the exhaust gas. A wire mesh capable of holding the catalyst and circulating exhaust gas is installed, and a hammering device having a hammer for hammering a seat attached to the wire mesh on the upstream side of the exhaust gas is installed in the denitrification device main body. Consisting of things,
In this hammering device, a support arm of a hammer that collides with a seat attached to a wire mesh is fixed to one end of a shaft rod rotatably supported by a bearing on a support base on the side of the main body, and A weight arm is fixed to the base of a rod, and a cam follower is formed at the other end of the weight arm. A sprocket is fixed to the other end of the camshaft, and a chain is wound between the sprocket and the sprocket of a motor with a reduction gear installed on the main body. Characteristic moving bed type for sintering furnace exhaust gas