The reactor block catalyst honeycomb structure

 

(57) Abstract:

The invention relates to the field of chemistry and relates to a reactor block catalyst honeycomb structure, comprising a housing with connections for input of initial reagents and output of the target product, inside of which is placed a block catalyst honeycomb structure, through channels of which with respect to the incident flow is oriented at an angle equal to 90. In block catalyst honeycomb structure hydraulic diameter of the through channels of different geometric shapes, starting with the first in the course of the stream, increases monotonically, reaching attitude of hydraulic diameters last channel to the first not more than 1.5. This reactor enables a better use of the catalyst. 1 Il.

The invention relates to catalytic reactors, namely the reactor block catalyst honeycomb structure, and can be used in the chemical industry for trapping nitrogen oxides and other harmful substances from exhaust gases or for certain stages in the process of manufacturing sulfuric, nitric and other acids, etc.

It is known that the implementation of such processes a wide Rasa disordered layer (see Kirillov, C. A., Ogarkov B. L., ravens Century, The Hydrodynamic modes in a three-phase stationary granular layer. Theoretical analysis.//Ing.-physics, Ukr. 1976. So 31. N 3. S. 402. ). Disordered granular fixed catalyst layer has a number of disadvantages: availability of surface heat to mass transfer at the grains of the catalyst is largely dependent on the flow regime, which in this layer have a complex unstable structure. Due to the heterogeneity of the packing of grains in disordered layer flow becomes inhomogeneous. Flow through the granular layer consisting of grains of different shapes (pellets, tablets, rings, and so on), is characterized by uneven distribution of velocity over the cross section to the volume of the layer. In addition, depending on the flow rates and grain sizes in disordered stationary granular catalyst layer detected five most typical hydrodynamic modes, which complicates the management of its use.

Known reactor block catalyst honeycomb structure (see Bespalov A. Century. and other Numerical simulation of the flow in the channels block catalyst // Theoretical foundations of chemical engineering. 1991. So 25. N 2. S. 234.). Characteristics and can be placed in the reactor, that form an ordered structure fixed catalyst layer, which is the most favorable for the implementation of chemical reactions, especially if the process is hampered vneshnediffuzionnoe transfer. On the inlet pipe flow with initial reagents supplied in the reactor vessel, inside which is placed a block catalyst honeycomb structure. Channels in block catalyst of honeycomb structure end - to-end and have the entire height of the block catalyst of the same hydraulic diameter. Pass-through channels with respect to the incident flow is oriented at an angle equal to 90o. The stream flows around the block catalyst honeycomb structure from the top down, and the stream is fed in such a way as to create several different potential speed on both sides of the block catalyst honeycomb structure. In this case, the contacting of the reagent stream with a catalyst as along its outer surface, and the surface through channels. With this arrangement, the block of the catalyst honeycomb structure in the reactor there are two main hydrodynamic mode: flow and penetration (instead of five for disordered granular fixed catalisano, since penetration is implemented, starting with 1/6 of the height from the bottom block of the catalyst honeycomb structure.

A disadvantage of such a reactor block catalyst honeycomb structure: starting with 1/6 of the height from the bottom of the block is the second hydrodynamic mode - penetration. In this hydrodynamic regime 1/6 block catalyst honeycomb structure is almost never used, especially at low Reynolds numbers (e.g., less than 50).

The present invention is to reduce the number of hydrodynamic modes of operation of the block of the catalyst honeycomb structure (in the reactor) to provide a more accurate and full control of its use.

The task in the alleged invention is solved by making the through channels of different geometrical shapes (e.g. round, square, hexagonal, triangular, and so on) in block catalyst honeycomb structure with different hydraulic diameter, and the hydraulic diameter of the through channels in block catalyst honeycomb structure increases monotonically, starting with the first in the course of the stream, reaching attitude of hydraulic diameters last channel to the first not more than 1.5.

o. The hydraulic diameter of the through channels monotonically increases downward along the stream, reaching attitude of hydraulic diameters last channel to the first not more than 1.5.

The device operates as follows. On the inlet pipe 2 flow from the source reagent is supplied into the housing 1 of the reactor, inside which is located a block catalyst honeycomb structure 4 through channels of different geometric shapes 5 (for example, round, square, hexagonal, triangular, and so on), arranged at an angle to the incident flow angle equal to 90o. The stream flows around the block catalyst honeycomb structure from the top down, and the stream is fed in such a way as to create several different potential speed on both sides of the block catalyst honeycomb structure. When there is monotonically increasing hydraulic diameter of the through channels in block catalyst honeycomb structure from above in the catalyst honeycomb structure, and throughout the surface of the end-to-end flows, including through channels located on 1/6 of the height from the bottom block of the catalyst honeycomb structure, there is a more full use of the catalyst over the entire height of the block catalyst honeycomb structure. By calculation, obtaining the velocity profile of the flow Poiseuille flow through the channels block catalyst honeycomb structure and solving the system of two-dimensional equations for the variables: function current - vorticity, as well as experimentally (using ray tracing), it was found that all through the channels on the height of the bulk catalyst honeycomb structure there is only one hydrodynamic regime - flow. The ratio of the hydraulic diameter of the latter and the first through-channels depending on the potential flow rates on both sides of the block catalyst honeycomb structure can reach a value of not more than 1.5.

Thus, the presence of one hydrodynamic regime flow all through the channels block catalyst honeycomb structure, the hydraulic diameter of which increases monotonically along the height of the block catalyst honeycomb structure with respect to hydraulic diameters reagents and makes better use of the modular catalyst honeycomb structure, even at values of Reynolds numbers less than 50.

The reactor block catalyst honeycomb structure, comprising a housing with connections for input of initial reagents, inside of which is placed a block catalyst honeycomb structure, through channels of which with respect to the incident flow is oriented at an angle equal to 90o, characterized in that a modular catalyst honeycomb structure hydraulic diameter of the through channels of different geometric shapes, starting with the first in the course of the stream, increases monotonically, reaching attitude of hydraulic diameters last channel to the first not more than 1.5.

 

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Catalytic converter // 2156165
The invention relates to catalytic converters

FIELD: production of honeycomb substrates for catalyst converters for two-wheeled or diesel vehicles.

SUBSTANCE: the invention is dealt with production of honeycomb substrates made out metal sheets piled or rolled in a package and minimized to the honeycomb elements used first of all as honeycomb substrates for catalyst converters in the systems of exhaust gas (EG) neutralization. There is a description of a honeycomb element (1) first of all as a honeycomb substrate for a catalyst converter for systems of two-wheeled vehicles exhaust gas neutralization. The honeycomb substrate for catalyst converter consists of some layers of metal sheets (2, 3) packed as a package or minimized in a roll, which are at least on separate sections are structured or profiled in such a manner, that they form for EG flowing channels (4). At that the metal sheets (2, 3) represent the sheets of high-quality steel of more than 0.08 mm thick with a share of aluminum from 6 up to 12 mass % multiplied by 0.02 mm and divide by "d" - thickness of the metal sheets (2, 3). The technical result - a possibility to use metal sheets depending on the share of aluminum in them and their thickness, that allows to use the sheets taken from production process of manufacture of a material subjected to a hot aluminization.

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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