JP2000296304A - Catalytic bag filter manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing device of catalyst roll press-contacting impregnated type by which a cylindrical bag filter is uniformly coated with a catalyst and its preparation time is shortened. SOLUTION: In a catalytic bag filter manufacturing device having: a catalytic slurry storage vessel 2; an agitating means 3 and a bag filter supporting roller 7 installed in the storage vessel 2; a bag filter hanging means 15 for winding a bag filter 5 like a U-shape on the supporting roller 7 to hang both ends thereof above the surface or the liquid of catalytic slurry; bag filter squeezing rollers 4 provided above the surface of the liquid of the catalytic slurry; and a driving means 6 provided successively to the hanging means 5 and for moving the bag filter 5 up and down in the vertical direction, a spraying device for spraying the catalytic slurry to the clearance between the tightening rollers 4 and a circulating means for withdrawing a part of the catalytic slurry in the storage vessel 2 to feed it to the spraying device are installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a bag filter to which a catalyst is attached (hereinafter, referred to as a catalyst bag filter manufacturing apparatus), and particularly to a combustion furnace such as a refuse incinerator where the NOx concentration in exhaust gas is apt to change rapidly. The present invention relates to an apparatus for manufacturing a catalytic bag filter for treating a flue gas in a combustion furnace, which efficiently reduces harmful components such as nitrogen oxides and dioxins in the exhaust gas.

[0002]

2. Description of the Related Art A so-called simple coating method is known as a method for manufacturing a catalyst bag filter according to the prior art, in which a bag filter having a cylindrical bag shape is immersed in a catalyst slurry in a slurry tank, then pulled up and dried. This makes it possible to obtain a catalyst bag filter to which the catalyst is attached almost uniformly (Japanese Patent Laid-Open No. Hei 5-7716). In the case of a catalytic denitration catalyst, for example, in the case of a reductive denitration catalyst, NOx in exhaust gas can be reduced and removed and gaseous dioxins can be decomposed by blowing ammonia or an aqueous solution upstream of the catalyst.

[0003] As shown in FIG. 3, a driving device 6 which can vertically move a container 2 for storing a catalyst slurry, a stirrer 3, and a bag filter 5 in a vertical direction is provided.
At a position above the catalyst slurry surface of the catalyst slurry storage container 2, and a supporting roller 7 for immersing and impregnating the bag filter in the catalyst slurry is provided below the catalyst slurry surface of the catalyst slurry storage container. The bag filter 5 is mounted in a U-shape through the support roller 7 in the catalyst slurry storage container, and the bag filter is vertically moved by the driving device 6 in the vertical direction. There is known a so-called catalyst roll pressure bonding impregnation method in which a catalyst slurry is impregnated inside while sandwiching a bag filter.

[0004]

However, these systems have the following problems. First, in the simple coating method, when the hydrophilicity of the surface of the bag filter is low, it takes time for the catalyst slurry to penetrate into the inside of the filter cloth, so that the production efficiency is reduced. The size of the bag filter mounted on the actual machine is 130-170mmφ × 6-7m
There is a large device as described above, and the installation area is large in a device for impregnating a horizontally placed bag filter.

In the case of a catalyst roll press impregnation type manufacturing apparatus as shown in FIG. 3, when a catalyst is applied to a cylindrical bag filter, metal fittings for mounting the actual machine are sewn to both ends 14 of the bag filter. Therefore, there is a problem that the catalyst slurry is not impregnated because it cannot be sandwiched by the squeezing roller, and both ends 14 need to be separately immersed in a slurry storage container.

Further, in the case of the manufacturing apparatus shown in FIG. 3, when the concentration of the catalyst slurry increases, the catalyst adheres to the squeezing roller 4 to form a catalyst layer, which tends to hinder uniform application of the catalyst. Therefore, the preparation is interrupted to remove the catalyst layer, and as a result, the preparation takes time. Also,
Conventionally, after a catalyst was applied to the bag filter, a long bag filter was suspended vertically to drain the water.However, the catalyst moved vertically downward due to gravity, and the amount of catalyst attached to the lower portion of the bag filter was reduced. There was a tendency to increase.

SUMMARY OF THE INVENTION An object of the present invention is to provide a catalyst roll pressure impregnation type manufacturing apparatus capable of uniformly applying a catalyst to a cylindrical bag filter and shortening the preparation time. It is an object of the present invention to provide a catalyst bag filter manufacturing apparatus capable of applying a catalyst to a catalyst bag and in a drying step after applying a catalyst slurry, without causing movement of the catalyst due to gravity and achieving uniform application.

[0008]

The above-mentioned problems can be solved by making the catalyst bag filter manufacturing apparatus of the present invention as follows. That is, the present invention provides: (1) a catalyst slurry storage container, a stirring roller provided in the storage container and a support roller for the bag filter, and a bag filter wound around the support roller in a U-shape so that both ends are formed. A suspension means for the bag filter suspended above the liquid level of the catalyst slurry, a squeezing roller for the bag filter provided above the liquid level for the catalyst slurry, and a squeezing roller connected to the suspension means, and A driving device for vertically moving through a catalyst bag filter device, a spray device for spraying a catalyst slurry in a gap between the squeezing rollers, and a part of the catalyst slurry in the storage container is withdrawn, and A catalyst bag filter manufacturing apparatus, comprising: a circulating means for supplying the apparatus to the apparatus. (2) The catalyst bag filter manufacturing device according to (1), wherein the catalyst bag filter manufacturing device is further provided with a drying device and a surface treatment device for the catalyst bag filter device.

According to the present invention, by providing a means for spraying the catalyst slurry on the squeezing roller, the catalyst slurry is uniformly applied to the entire surface including both ends of the bag filter, and the catalyst slurry is pressure-impregnated and impregnated by the squeezing roller. can do. As a result, even in bag filters with low hydrophilicity on the surface,
It is possible to prepare a catalyst bag filter having a uniform concentration in a short time. Also, when carrying a long object (6 to 7 m), the installation area does not need to be very large.

[0010] Further, in the above manufacturing apparatus, by further adding a drying device using hot air or the like and a surface treatment device, the catalyst slurry is applied to the bag filter, and then the surface is dried using hot air or the like to obtain a uniform concentration. After preparing the catalyst bag filter of the above, the outer surface of the bag filter is cleaned with a surface treatment device to remove the catalyst attached to the outer surface of the bag filter, thereby reducing the pressure loss and making the catalyst bag easy to handle. A filter can be manufactured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. FIG. 1 is an explanatory diagram of an apparatus for manufacturing a catalyst bag filter for treating a combustion furnace exhaust gas according to the present invention.

The apparatus comprises a driving device 6 which can vertically move the container 2 for storing the catalyst slurry 1, the stirrer 3, and the bag filter 5 by suspending them with the wires 19 and the hooks 13. 4 is provided at a position above the level of the catalyst slurry in the catalyst slurry storage container 2, and one set of impregnated support rollers 7 is provided at a position below the level of the catalyst slurry in the catalyst slurry storage container 2; The bag filter 5 is wound in a U-shape in the catalyst slurry storage container 2 and is engaged with the hook 13 of the driving device 6. The circulation pump 8 for circulating the catalyst slurry 1, the pipe 12, and the catalyst A spray nozzle 9 for spraying the slurry 1 into the gap between the squeezing rollers 4 is provided. The driving device 6 vertically moves the bag filter 5 up and down, and the catalyst filter is pressure-impregnated and impregnated therein while the bag filter 5 is sandwiched between the squeezing rollers 4 via the impregnation support rollers 7. The squeeze roller 4 can be made of various materials such as a rubber roller, a metal roller, and a Teflon roller. According to this embodiment, while the catalyst filter 1 is pressed and impregnated inside the bag filter 5 while being sandwiched by the squeeze roller 4, the spray nozzle 9 is provided in the gap between the squeeze roller 4, so that the squeeze roller 9 is provided. 4 to prevent drying, prevent the catalyst from adhering to the squeezing roller 4 and hinder the stable production, and make the catalyst slurry 1 uniformly including the upper and lower ends of the bag filter 5. Can be applied.

FIG. 2 is an explanatory view of a catalytic bag filter manufacturing apparatus showing another embodiment of the present invention to which a drying step is added. This apparatus is obtained by adding a drying apparatus 10 and a surface treatment apparatus 11 to the manufacturing apparatus shown in FIG.
After applying the catalyst slurry 1 to the bag filter 5, one end of the bag filter is removed from the hook 13, the bag filter is moved in the horizontal direction, and the bag filter is passed through a drying device 10 including a hot blast stove, a heater, etc., and the surface is dried quickly. Thus, a catalyst bag filter having a uniform concentration is prepared. Thereafter, the outer surface of the bag filter is cleaned by the surface treatment device 11 to remove the catalyst attached to the outer surface of the bag filter. The surface treatment device 11 may be any device that can clean the surface of the bag filter to the extent that it does not damage the surface of the bag filter. For example, a plurality of rake-shaped metal rods, metal plates, metal fibers, chemical fibers, felt, animal hair, etc. Goods can be used. According to this embodiment, the catalyst can be adhered to the surface of the bag filter 5 at a more uniform concentration without causing concentration unevenness due to gravity during drying, and the surface can be cleaned. The pressure loss of
There are also advantages such as easy handling.

[0014]

According to the present invention, the catalyst slurry can be uniformly applied to the entirety including both ends of the bag filter, and the uniformity and handling can be improved by adding a specific drying means. Can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a catalytic bag filter device showing one embodiment of the present invention.

FIG. 2 is an explanatory view of a catalyst bag filter manufacturing device of the present invention having a drying device.

FIG. 3 is an explanatory diagram of a conventional catalyst bag filter manufacturing apparatus of a catalyst roll pressure impregnation system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Catalyst slurry, 2 ... Container, 3 ... Stirrer, 4 ... Squeeze roller, 5 ... Bag filter, 6 ... Driving device, 7 ... Crimping support roller, 8 ... Circulation pump, 9 ... Spray nozzle, 10 ... Drying device, 11 ... Surface treatment device, 12 ... Piping, 13 ... Bag filter fixture (hook), 14 ... Bag filter both ends, 1
5 ... wire.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D019 AA01 BB01 BC07 CA04 CB04 CB07 4D048 AA06 AA17 BB05 4D058 JA04 JB22 JB41 SA20

Claims (2)

[Claims] 1. A storage container for a catalyst slurry, a stirring roller provided in the storage container and a support roller for a bag filter, and a bag filter wound around the support roller in a U-shape to form a catalyst slurry at both ends. Suspension means for the bag filter suspended above the surface, a squeezing roller for the bag filter provided above the liquid surface of the catalyst slurry, and a squeezing roller connected to the suspension means, wherein the bag filter is vertically connected via the squeezing roller. A catalyst bag filter device having a driving means for vertically moving in a direction, a spray device for spraying a catalyst slurry into a gap between the squeezing rollers, and a part of the catalyst slurry in the storage container withdrawn and supplied to the spray device. An apparatus for manufacturing a catalytic bag filter, comprising: a circulating means. 2. A catalyst bag filter manufacturing apparatus according to claim 1, wherein said catalyst bag filter manufacturing apparatus further includes a drying device and a surface treatment device for the catalyst bag filter device.