Arrangement for settling covers in a liquefying layer

FIELD: the invention refers to application of covers in a liquefying layer particular to an arrangement for settling covers in a liquefying layer.

SUBSTANCE: the arrangement for settling covers in a liquefying layer has a chemical reactor of a cylindrical form and a system of feeding with liquefiable gas, the inner surface of the cylindrical reactor is provided with vertical grooves located on ribs of regular polygons inscribed into the inner diameter of the reactor. At that the number of grooves is chosen in the limits 3-20, the grooves in the section have a form of an equilateral triangle and for a reactor with a diameter of 20-100 mm the relation of squares of transversal sections of the reactor and of all grooves is in the limits 100-200.

EFFECT: the invention provides stability of a liquefying layer at essential increasing of the particles' mass in the process of applying a cover.

1 cl, 1 dwg

 

The invention relates to the field of materials and can be used in chemical, atomic and electronic engineering.

Ceramic materials such as silicon carbide and pyrocarbon, have high thermoresistance, corrosion resistance, and are a reliable protective barrier against fission fragments in the fuel elements (cartridges) of nuclear reactors (Being D. high-temperature Gas-cooled reactors. TRANS. with it. M: Atomizdat, 1975, 224 S.). Wide application of coatings produced from the gas phase, found in the composition of the ceramic elements snap to diffusion annealing of large-scale integrated circuits microelectronics (patent Application in Japan. Priority from 12.08.95, No. 072210338 And IPC H 01 L 21/22).

For these fields are obtained from the gas phase in the fluidized bed (PS) coverage must meet certain requirements and have the following characteristics:

- theoretical or close to the density of the material;

the thickness of the coating along the length of articles should not exceed the values ±10-15 microns;

- roughness - height of the projections is not more than 3-5 microns;

the content of impurities, especially metals, at the level of 3-5 ppm;

- lack of micro - and microtrain.

Upon receipt of the coatings in the PS, the main difficulty lies in the destruction of the substation as of the change of mass of the particles, their density and diameter.

The stability of the PS when changing the characteristics of the coated particles can be increased by changing the pressure in the zone substation. A device for deposition of the coatings described in the method of deposition of silicon carbide, comprising a pressure control unit in the range of 0.1 to 200 Torr (Application for Japan patent No. 03130366 And from 21.01.97, IPC 04 In 38/00). The disadvantage of this device lies in the fact that the increase in pressure can stabilize PS only by increasing the mass of the particles is not higher than 50%.

The closest in technical essence to the problem at hand is the apparatus for the deposition of coatings in the PS, including the chemical reactor of cylindrical shape, the heating unit and the gas supply system (U.S. patent No. 3399969 And 01 In 31/00, 1968).

The disadvantage of the described device is in the low range value changes of the mass of the coated particles while maintaining the stability of the PS.

The basis of the proposed system PS based on the task of ensuring the stability of the PS with a significant increase in the mass of particles.

According to the invention this task is solved in that in the known apparatus of the substation, including the chemical reactor of cylindrical shape and the delivery system fluidizing gas, the inner surface of the cylindrical reactor provided with vertical slots located on the edges correct INR is ohrannikov, entered into the inner cylinder of the reactor, and the number of grooves is chosen in the range 3-20.

In addition, the grooves have a cross section the shape of an equilateral triangle, and the diameter of the reactor 20 to 100 mm, the ratio of the areas of cross-sections of the reactor and all of the slots is chosen in the range of 100-200.

The proposed device is shown schematically in the drawing, where: 1 - chemical reactor, 2 - conical diffuser, 3 - tube for feeding fluidizing agent, 4 - groove.

The proposed device is justified as follows. Each diameter of the cylindrical reactor correspond to specific values of the mass, diameter, density of the coated particles, and the linear velocity siraudeau agent. Experiments in glass tubes with an inner diameter of 25 mm with particles of zirconium carbide with a diameter of 0.5 mm, a density of 6 g/cm3, fluidizing agent - argon showed that sustainable PS is implemented with the weight of the portion 5, it is shown Experimentally that when the change in sample mass on ±25% PS collapses at any speed. When this perturbation in TS are increasing in the upper zone, and then cover the entire PS.

A cylindrical reactor, equipped with vertical grooves resets particle in the perturbed region down due to the increased hydrodynamic resistance in the slots. This leads to reduced the speed of the movement is of the gas in the grooves and thus, the movement of particles from the top of the perturbed zone down. The proposed device has two major advantages:

1) stabilizes the PS with a significant increase in the mass of particles during deposition;

2) intensifies the process of heat and mass transfer by providing additional mixing of the particles.

It is experimentally shown that by increasing the diameter of the reactor from 20 mm to 100 mm relative to the number of grooves increases from 3 to 20. When the grooves are placed on the edges of the convex polyhedra with a number of parties 3-20, entered into the inner cylinder of the reactor.

Also it is shown that if S1/S2>200 (S1- the cross-sectional area of the reactor, S2- the total cross-sectional area of the grooves), the intensity of mass transfer and, thereby, the stability of the PS is reduced due to a significant reduction in cross-section, along which the particles move downwards, while if S1/S2<100 significant increase of the gas velocity in the slots prevents oncoming traffic particles. The proposed device is illustrated by the following examples of implementation.

The maximum ratio of the final and initial mass of particles in the PS was achieved in a cylindrical reactor with an inner diameter of 32 mm (S1=8 cm2), is equipped with four vertical grooves having a sectional shape of runaction is his triangle with sides of 1.8 mm (S 2=6,6 mm2) when the ratio of S1/S2=121. The grooves on the inner surface of the glass cylinder was obtained by making a special mandrel with an inner diameter equal to the outside diameter of the tube. Mandrel contained protrusions having in cross section the shape of an equilateral triangle. The grooves in the reactor was obtained after heating of the tubes and blow them into the pots. It is shown that the proposed substation apparatus stability is preserved when you change the mass of the particles 10 times.

Thus, the proposed solution has the following advantages compared with the known:

1. Provides resistance SS in the reactor constant diameter, by increasing the mass of the particles 10 times.

2. Intensify mass transfer in PS.

1. Device for deposition in the fluidized bed containing the chemical reactor of cylindrical shape and the delivery system siraudeau gas, characterized in that the inner surface of the cylindrical reactor made with vertical slots located at the vertices of regular polygons inscribed in the internal diameter of the reactor, and the number of grooves is chosen in the range 3-20.

2. The device according to claim 1, characterized in that the grooves have a cross section the shape of an equilateral triangle, and for a reactor with a diameter of 20-100 mm, the ratio of the areas of the cross behold the response of the reactor and all of the grooves is in the range of 100-200.



 

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