A method of manufacturing activated tubular catalytic element (options)

 

(57) Abstract:

The methods include the production of direct-flow reactors with activated blast wall layer of the catalyst and include coaxially located inside the metal tube of a cylindrical explosive charge, filling the catalyst cavity between the explosive charge and the inner surface of the pipe, the initiation of the explosive charge. For option 1 on the inner surface of the pipe previously put roughness. The height and spacing of profile irregularities choose comparable to the thickness of the layer of catalyst. And between the explosive charge and the catalyst bed to provide a co-axial air gap equal to

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where D is the internal pipe diameter, dBBthe diameter of the explosive chargeCC,cat- density explosives and catalyst - coefficient depending on the properties of explosives and catalyst. On the ends of the pipes install a metal cover with a height equal to the pipe diameter and thickness equal to = adCCwhere a is a coefficient depending on the properties of the explosive material of the caps and tubes. The entire Assembly before initiating charge is placed in protivoraketa surface of the pipe coaxially them additionally set the mesh. 2 S. and 2 C.p. f-crystals, 4 Il.

The claimed group of inventions relates to the production of direct-flow reactors with activated blast wall layer of the catalyst. Made catalytic element represents an elementary reactor capable of operating in various environments, including forced convective heat transfer with a low and constant gas-dynamic resistance, and its size can vary within wide limits.

A known method of manufacturing a tubular catalytic element with the wall layer of the catalyst, according to which it is mixed catalytic mass with a binder liquid polymer heat-resistant glue, mixing, loading in the form of split, compaction and sintering at a temperature of 600oC for 3 hours (US 4541996 And 17.09.1985).

The known method according to which the first extrusion tube is formed of aluminum oxide (Al2O3), which surface is then covered with a catalyst (SU 725698 And 05.04.1980).

The disadvantages of these technologies should include the complexity of increasing the activity of the catalyst in the process of its application.

The known method according to which made the cat the er and loaded detonation wave external explosive charge. This method requires complex tooling disposed at each stop, and a large flow CENTURIES, since the weight of CENTURIES, usually for one, two orders of magnitude greater than the mass of the treated catalyst. The catalyst after compression remains in the form of a powder or a separate class, and then you want its subsequent shaping (SU 1273156 And 30.11.1986).

The closest technical solution is a method of manufacturing a tubular catalytic element, which consists in placing inside a metal tube of a cylindrical explosive charge (CC), filling the catalyst cavity between the inner surface of the pipe and the explosive charge to initiate the explosive charge (EN 2036721 C1, 09.06.1995).

This solution, as the closest to the technical essence and the achieved result is selected as the closest analogue for both variants of the method of manufacturing activated tubular catalytic element. However, it has the following disadvantages:

the presence of a deformation of the pipe end with the passage of the detonation wave and, as a consequence, the spalling limit layers pressed catalyst to a height equal to ~ the diameter of the pipe;

- in operation to the I of the catalyst due to its lack of rigidity and the strength of adhesion with the surface of the pipe;

- in the implementation of the method requires special equipment, which prevents destruction of the pipe when the explosion of the charge, or require the use of thick-walled indestructible pipe that leads to a significant consumption of metal;

- there are a number of catalysts that cannot be applied to the metal surface due to their poor pressuemosti, for example, activated carbon - Sibunit.

Task to be solved by the present group of inventions is correct known deficiencies. The technical result is to improve the performance of catalytic reactors by improving the quality of the coating.

This technical result is achieved in that in the method of manufacturing activated tubular catalytic element comprising coaxially located inside the metal tube of a cylindrical explosive charge, filling the catalyst cavity between the explosive charge and the inner surface of the pipe, the initiation of the explosive charge according to the invention:

FOR OPTION I:

the inner surface of the pipe is pre-machined, consisting in applying sherohovatami the thickness of the layer of catalyst;

between the explosive charge and the catalyst bed to provide a co-axial air gap equal to

< / BR>
where D is the internal diameter of the pipe; dBB- the diameter of the explosive charge;CC,cat- explosive density and catalyst, respectively; is the coefficient depending on the properties of e and catalyst;

- at the end of the pipe install metal cover, preventing deformation with the passage of the detonation wave, and the height of the cap is chosen equal to the pipe diameter and thickness equal to = a-dCCwhere a is an empirical coefficient depending on the properties of EXPLOSIVE materials covers and tubes;

- the catalytic element in the collection prior to initiating the explosive charge is placed in protivorazgonnoy snap-in, which prevents destruction of the tube, while the explosion of the charge;

FOR OPTION II:

between the explosive charge and the inner surface of the pipe coaxially they set the mesh, increasing the strength properties of the catalyst;

- the size of the cells and the thickness of the grid is chosen commensurate with the thickness of the layer of catalyst;

between the explosive charge and the catalyst bed to provide a co-axial air gap equal to

< / BR>
where D is the internal diameter of the pipe; dBB- the diameter of the explosive charge;CC,cat- p is icy pipe install metal cover, preventing deformation with the passage of the detonation wave, and the height of the cap is chosen equal to the pipe diameter and thickness equal to = a-dCCwhere a is an empirical coefficient depending on the properties of EXPLOSIVE materials covers and tubes;

- the catalytic element in the collection prior to initiating the explosive charge is placed in protivorazgonnoy snap-in, which prevents destruction of the tube, while the explosion of the charge.

When using trudnoreshaemyh catalysts, the process can be carried out in two stages: first in the inner surface of the pipe to form a layer of leggierissimo media, and the second applied layer of the catalyst.

As protivorazgonnoy snap can be used indestructible metal ferrule on the outer surface of the pipe is pre-applied protective layer, the height of the metal cover is equal to the outside diameter of the cage.

Distinctive characteristics in a stable relationship all essential features enabled:

- due to the preliminary coating on the inner surface of pipe roughness to increase the strength of adhesion of the catalyst with the inner surface of the pipe;

- due to the use of armywar and to increase its durability;

- by providing between the explosive charge and the catalyst layer of the air gap is:

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to improve the quality of the coating, to regulate the amount of catalyst layer and to provide optimum pressing conditions in the catalyst;

- due to the use of nondestructive covers to reduce the deformation of the pipe end and thus avoid the spalling limit layers pressed catalyst;

- due to the use of protivorazgonnoy snap to exclude the possibility of fracture of the pipe when the initiating charge;

- due to double exposure allows the production of tubular catalytic element with trudnoreshaemyh catalyst, such as activated carbon with the addition of silver.

Each of these essential features required, and their combination is sufficient to achieve novelty quality, new overharvest, and no amount of effects and extrinsic characteristics in their disunity.

The essence of the proposed technical solution is illustrated by drawings, where Fig. 1 shows a device for the manufacture of activated tubular catalyst for implementing the method according to variant I, with pre-applied rough on Aligator, implementing the method according to variant II with the use of reinforcing mesh between the inner surface of the pipe and the explosive charge, and a second device depicted ustanovlennym in indestructible metal clip. In Fig.3 shows a graph of the optimum modes pressing. In Fig.4 shows the inner surface of the pipe caused by the roughness.

The device through which implement the method of manufacturing activated tubular catalytic element according to variant I, is shown in Fig.1 and consists of a metal tube 1, the inner surface of which is applied the roughness of 2, for example, the thread height and pitch profile 0.5-2 mm, comparable with the thickness of the layer of catalyst ~2-5 mm Inside the pipe axis placed the explosive charge 3, made in the form of an elongated cylinder. The lower and upper openings of the tube is closed by a metal lid 4. The sizes of covers to choose from conditions nerazreshimosti end of the tube, i.e. the height of the caps should not be less than the pipe diameter and thickness equal to = a-dCCwhere dBBthe diameter of the explosive charge and the empirical coefficient depending on the properties of the EXPLOSIVE material covers and pipes.

The condition of nerazreshimosti can be performed as the absorbed selectively by the pigments of the Sabbath.">

Looseness caps are selected so as to exclude mutual mechanical displacements of structural elements during the Assembly operations.

In the cavity between the inner surface of the pipe and the explosive charge fall asleep catalyst 5, and between the outer surface of the battery 3 and the catalyst 5 provide a co-axial air gap 6, the size of which allows optimal compaction of the catalyst at a given geometry and density of the catalyst and CENTURIES. It is known that during pressing of powder materials explosion for each material powder and explosives have its optimal ratio of the mass of explosive (mBB) to the mass of powder (mCC)

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moreover, the increase of mCCcorresponds to the mode overclamping and is accompanied by cracking of the finished catalyst, and the reduction of mBBcorresponds to the mode negapressure when the finished catalyst get loose with insufficient strength. Based on a cylindrical geometry of the device that implements the method, the above formula is converted to

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This Ozanam that for each type of CC there is a hyperbolic dependence of the optimal ratio is iej between modes overclamping and negapressure (Fig.3).

If necessary, applying a certain thickness of the coating is only a single value of the pipe diameter for a given BB will match the optimal pressing. To ensure the conditions of extrusion in a wide range of pipe sizes and thicknesses of layers deposited catalyst you need to enter the air gap 6 (see Fig.1, 2), the thickness of which is determined by the ratio

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where dZAZ,d- the diameter of the gap and the density of the air in the gap, respectively.

Given thatZAZcatby

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you can therefore neglect the diameter of the clearance required for optimal compaction will be determined as

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Thus, determining the magnitude of the air gap between the explosive charge and mass of the catalyst, in accordance with the above formula provides the optimal pressing for a given mass of catalyst and type of EXPLOSIVES.

A variant of the first method is to increase the bonding strength of the catalyst with the inner surface of the pipe, through the fuzz. Thereby provide an increase in the contact surface of the catalytic layer and the wall and eliminates the formation of a gap between the DNAs is x at a relatively constant temperature.

The device shown in Fig.2, through which implement the method of manufacturing activated tubular metal element under option 2, consists of structural elements, the same as option I, the distinctive features of this variant of the method are used as the retaining element reinforcing mesh 7 with a thickness of 0.1-0.5 mm and a cell size of 1-3 mm, comparable with the thickness of the catalyst 2-5 mm. mesh is placed in alignment between the explosive charge and the inner surface of the pipe.

Option II method is applicable when the catalyst under conditions of cyclic temperature regimes or in cases where the weakest catalysts to prevent it from cracking and reliable retention inside the pipe.

In some cases, the use of unstable catalysts operating in conditions of cyclic thermal loads, possibly combined use of both variants ways.

To prevent the erosion of pipes under shock wave impact, as protivorazgonnoy snap-in use the container with sand.

When used as a catalytic elementary snap use of indestructible metal ferrule 8, in addition, to facilitate extraction (squeezing) of the catalytic element after explosive pressing on the outer surface of the pipe is pre-applied protective layer 9.

The lid when it is made on the size of the cage.

Examples of the application of the method of manufacturing activated tubular catalytic element according to the claimed group of inventions.

Example 1. Inside the tube 1 (see Fig.1) made of steel NET, an inner diameter of 19 mm, an outer diameter of 25 mm and a length of 200 mm cut internal threads M,5, on the lower orifice of the tube was put on the lid 4 with the height of 25 mm and a wall thickness of 5 mm, made of aluminum alloy D16T). Inside the pipe axis was placed a cylindrical charge 2 diameter of 4.5 mm of condensed EXPLOSIVES, made from elastica EG-85. The space between the explosive charge and the inner surface of the pipe was filled with catalyst 5. Used three types of catalysts: marginalutility, _Al2O3and JCC with the same density backfill cat= 0.9 g/cm3. Optimum pressing in this case was consistent with zero gap, i.e., dZAZ=dBB. Top opening covered by a cover 4 made of aluminum alloy. With the poison 3. The result has been a uniform coating thickness of ~3 mm for all three types of catalysts.

Example 2. Similar to example 1 with the difference that all operations were repeated twice. When you first detonation as a catalyst was used-Al2O3with an initial density of backfillcat= 1.1 g/cm3the diameter of the gap was 7.7 mm After compression obtain uniform coating thickness of 2.5 mm At the second detonation as a catalyst was used activated carbon, where dZAZ=dBB. After the secondary compression on the inner surface turned out to be Al2ABOUT3uniform coating of coal thickness of ~0.5 mm

Example 3. The coating of the catalyst-Al2O3for thin-walled pipe of steel 12X18H10T outer diameter of 36 mm, a wall thickness of 2 mm and a length of 300 mm as a reinforcing element mesh was used 7 stainless steel. The cylindrical charge 3 (see Fig.2) from bulk RDX CCof-1.0 g/cm3had a diameter of 11 mm Diameter gap dZAZ=16,5 mm On the outer surface of the pipe was applied protective layer 9 - oil paint thickness of 0.2 mm Pipe 1 installed in a steel cage 8 - cylinder of the Article.3 a length of 300 mm, internal diametre pipe 1, axis was placed in series:

the cylindrical charge 3, paper tube to provide an air gap 6 and the reinforcing mesh 7. To ensure coaxiality installation under the paper tube and the mesh covers are made of concentric grooves. The space between the inner surface of the pipe 1, and a paper tube filled with catalyst. Top opening closed by a cover made of aluminum alloy. Produced undermining the detonator 10, causing detonation of the charge 3. After the blast processing the finished catalytic element is removed from the set manually. The remains of an oil paint solvent was removed on the basis of turpentine (for example, RS-2). In the compression received a uniform coating thickness of 3 mm

The number of examples does not limit the way in both versions. When using condensed elastic BB method allows you to apply a coating on the inner surface of the bent pipe, for example, on the exhaust pipes of internal combustion engines, etc., the Method has no restriction on the part of the geometric dimensions of the catalytic elements.

The use of the proposed technical solutions allows you to:

due reguliruemoj is Isadora and densities of the initial backfill;

- due to the use of indestructible metal covers to prevent deformation of the pipe end and, as a consequence, to avoid the splitting of the upper layers pressed catalyst;

- due to the use of reinforcing mesh and coating roughness on the inner surface of the pipe to increase the strength of extruded catalyst and the strength of its coupling with the pipe wall;

- due to the use of the container with sand or indestructible metal sleeve to exclude the possibility of destruction of pipes under shock wave impact.

1. A method of manufacturing activated tubular catalytic element comprising coaxially located inside the metal tube of a cylindrical explosive charge, filling the catalyst cavity between the explosive charge and the inner surface of the pipe, the initiation of the explosive charge, wherein the inner surface of the pipe previously put roughness and the height and spacing of profile irregularities choose comparable to the thickness of the layer of catalyst, while between the explosive charge and the catalyst bed to provide a co-axial air gap equal to

< / BR>cat - density explosives and catalyst;

- coefficient depending on the properties of explosives and catalyst, and to the ends of the pipes install a metal cover with a height equal to the pipe diameter and thickness equal to = adCCwhere a is a coefficient depending on the properties of the explosive material of the caps and tubes, and then the entire Assembly before initiating charge is placed in protivorazgonnoy snap-in, which prevents destruction of the pipe.

2. A method of manufacturing activated tubular catalytic element comprising coaxially located inside the metal tube of a cylindrical explosive charge, filling the catalyst cavity between the explosive charge and the inner surface of the pipe, the initiation of the explosive charge, characterized in that between the explosive charge and the inner surface of the pipe coaxially they set the mesh, and the size of the cells and the thickness of the grid is chosen commensurate with the thickness of the layer of catalyst, and between the explosive charge and the catalyst bed to provide a co-axial air gap equal to:

< / BR>
where D is the internal diameter of the pipe;

dCCthe ora;

- coefficient depending on the properties of explosives and catalyst

and at the end of the pipe install metal cover height equal to the pipe diameter and thickness equal to = adCCwhere a is a coefficient depending on the properties of the explosive material covers and pipes, then the Assembly before initiating charge is placed in protivorazgonnoy snap-in, which prevents destruction of the pipe.

3. The method according to p. 1 or 2, characterized in that when using trudnoreshaemyh catalysts, the process is carried out in two stages: first on the inner surface of the pipe to form a layer of leggierissimo media, and in the second put the catalyst layers.

4. The method according to p. 1 or 2, characterized in that as protivorazgonnoy snap use of indestructible metal housing and the outer surface of the pipe is pre-applied protective layer, the height of the metal cover is equal to the outside diameter of the shroud.

 

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EFFECT: the invention ensures a possibility to use metal sheets for the purpose depending on the share of aluminum in them and their thickness.

5 cl, 1 dwg

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