RU2712695C1 - Method of manufacturing a block regenerative product - Google Patents

Abstract

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of block regenerative products based on alkali metal oxide compounds applied on a porous substrate and intended for regenerative cartridges. Disclosed is a method of producing a block regenerative product involving treatment of an initial regenerative product in the form of a tape containing reinforcing material impregnated with an active component in form of an alkali metal superoxide, preferably potassium or sodium, by acting on it with forming corrugating tool in mold with subsequent thermal stabilization. Initial regenerative product is preliminarily cut into preforms of predominantly rectangular shape, folding the preforms into a stack and subjecting the stack of preforms to molding by means of a sealing action with a forming corrugating tool at specific pressure of 10.0 to 60.0 MPa and subsequent holding under pressure for 0.15 to 5 minutes to produce corrugated plates, after which unit is assembled from corrugated plates by superimposing them on each other, wherein the plates, either even or odd, during laying are oriented so that longitudinal corrugations of the projection in the "view from above" intersect with each other, and fixing the plates of the block by applying an inert gas-permeable shell on its side surface.

EFFECT: invention simplifies the technology of producing a regenerative product in the form of profiled plates for channel units.

4 cl, 15 dwg

Description

The invention relates to a technology for manufacturing block regenerative products based on alkali metal oxide compounds deposited on a porous substrate and designed to equip regenerative cartridges.

A known method of manufacturing a structured regenerative product (RF Patent 2591164, IPC B01J 20/04, 2016). The initial reinforcing material in the form of a mat or tape is moistened with solutions of the target products, after which the excess solution is squeezed out on a perforated plate with a roll. Then, the impregnated reinforcing material is placed between two perforated plates and dried in a vacuum chamber. First, drying is carried out under vacuum without heat for 15-30 minutes, after which the product is subjected to infrared heating at a heating rate of 5 ÷ 10 deg / min, followed by exposure at a temperature of 125-135 ° C for 10-20 minutes. Final molding is carried out simultaneously with the drying process.

The disadvantage of this method is the wide variation in the geometric characteristics of the plates due to the final molding simultaneously with the drying process due to warping of the plates during the drying process, which does not allow for a uniform flow of air-gas mixture through a block assembled from the obtained plates.

This disadvantage is partially eliminated in the method of pressing preformed or flat billets according to the patent of the Russian Federation 2323085, IPC B28B 3/00, B28B 17/00, 2008. The method of pressing preformed flat ceramic billets consists in the following steps:

a) place preformed blanks separately from each other on a conveyor belt,

b) move the tape with the billet for pressing in the pressing unit, equipped with at least one upper stamp, which is associated with the stamping plate,

C) measure the position of the preformed billet relative to the position of the stamp of the press using suitable means for measuring

g) compare the measured values with the corresponding predetermined reference values,

e) based on the result of such a comparison, the press stamp is positioned exactly above the specified workpiece and with the same orientation as the workpiece on the conveyor belt,

e) carry out the pressing of the preformed billet with obtaining tiles.

According to this method, the measuring means are supported by a press die, the measurement includes measuring the distance between the measuring means and two different points on at least one edge of the workpiece, the measurement includes measuring the distance between the measuring means and one point on one edge of the workpiece and the distance between the measuring tool and one point on the adjacent edge of the workpiece or includes measuring the distance between the measuring tool and two different points on the same edge The workpiece and the distance between the measuring tool and two different points on the adjacent edge of the workpiece. The tile is preformed under pressure, preferably from 1 to 10 MPa.

This method can be used for cutting strip type materials, however, for the manufacture of block regenerative products, on which it is necessary to perform corrugations and when assembling into a block - half of the plates obtained are turned over to the other side, it is not applicable.

Known adopted as a prototype method of manufacturing a catalytic block of an exhaust gas catalyst (RF Patent 2028469, IPC F01N 3/28, B01J 35/04, publ. 1995). The catalytic unit contains a roll made of corrugated heat-resistant steel tape. The tape is wound in layers that originate in the center of the block and turn by turn, overlapping each other, curl into a gas-permeable roll. The hollows and ridges of the corrugations of the tape are located at an angle, or along an arc, or along a broken line to the edge of the tape. The crests of one layer are placed with the possibility of intersection with the hollows of the adjacent layer with the formation of gas channels, the surface of which is coated with a catalyst. The ridges and depressions of adjacent layers at the intersections are pressed one into the other. A method of manufacturing a catalytic block of an exhaust gas neutralizer by corrugating a heat-resistant steel tape on at least one roll, winding layers from a roll tape, forming an oxide layer on the surface of the tape and applying a catalyst to it, after crimping the tape, it is heated between two coil fixing electrodes , and indentation of crests and troughs of corrugations of adjacent layers at their intersections.

The amount of indentation in the process of winding is kept constant, or the amount of indentation in the process of winding is changed. In order to reduce tape waste in production, a roll is formed from two pieces of tape on independent rolls.

This method provides minimal resistance to gas flow during gas purification with a catalyst deposited by impregnation of a carrier with salts of noble metals and their subsequent reduction. In turn, the metal oxide support can be baked to steel. However, this method is not applicable in the manufacture of a block from a regenerative product, which instead of metal tapes contains a fibrous substrate impregnated with alkali metal superoxide. Such a substrate can withstand a single deformation, but, due to the fragility of the product, longitudinally deformed sections of the impregnated substrate cannot be transformed in the transverse direction, and vice versa.

The technical result of the invention is the creation of a method that provides a regenerative product for all types of insulating breathing apparatus and collective protective equipment with chemically bound oxygen and the execution of the product in the form of blocks of profiled plates.

The technical result is achieved by a method of manufacturing a block regenerative product, including processing the initial regenerative product in the form of a tape containing a reinforcing material impregnated with an active component in the form of an alkali metal superoxide, preferably potassium or sodium, by exposing it to a forming corrugating tool in a mold followed by thermal stabilization. According to the invention, the initial regenerative product is pre-cut into preforms of a predominantly rectangular shape, put the preforms in a bag and subjected to a package of preforms molding by sealing action with a forming corrugating tool and subsequent exposure under pressure for a certain time to obtain corrugated plates, after which the block is assembled from corrugated plates overlapping them, while the plates, either even or odd, are oriented in such a way when laying the basics so that the longitudinal axis of the corrugations in the projection "top view" intersect with each other, and the fixation of the plate blocks by applying an inert gas-permeable shell to its lateral surface.

The package of preforms is formed at a specific pressure of 10 to 60 MPa, followed by exposure to pressure for 0.15 to 5 minutes.

Thermal stabilization of the regenerative product is carried out by blowing a block of corrugated plates at atmospheric pressure with a stream of dried and decarbonized air or inert gas at a temperature of from 20 ° C to 160 ° C for from 0.5 to 2.0 hours.

The regenerative product is formed in the form of corrugated plates with the arrangement of the longitudinal axes of the corrugations at an angle of 5 ° to 45 ° to the longitudinal axis of the plate.

After molding the regenerative product in the form of corrugated plates, the plates are trimmed along the contour to the block dimensions in the “top view” projection.

An inert gas-permeable shell on the side surface of the block is formed by winding on it several layers of inert gas-permeable material such as glass paper.

Formation of the regenerative product is carried out by a forming corrugating tool from a material inert to the regenerative product, preferably from fluoroplastic or stainless steel.

Preliminary cutting of the initial regenerative product into preforms of a predominantly rectangular shape, folding the blanks into a bag and subjecting the package of blanks to molding by means of a sealing action with a forming corrugating tool and subsequent holding under pressure for a certain time to obtain corrugated plates, subsequent assembly of the block from corrugated plates by superimposing them to a friend, in which the plates, either even or odd, are oriented in this way when laying, To the longitudinal axis of the corrugations in the projection "top view" intersect with each other, and fixing plates unit by superimposing on its lateral surface an inert gas-permeable membrane provides high consumer product regenerative properties: high mechanical strength, easy formation of block and minimum flow resistance when breathing.

Forming a package of preforms at a specific pressure of 10 to 60 MPa, followed by holding it under pressure for 0.15 to 5 minutes, provides high mechanical strength of the plates, since when pressed at a pressure of less than 10 MPa, the plates begin to collapse under mechanical shock, for example, during transport tests, and at pressures above 60 MPa, the regenerative product due to repressing has insufficient kinetics of the chemisorption process. Exposure under pressure for 5 minutes is used at a minimum molding pressure, and 0.15 min at a maximum.

Thermal stabilization of the regenerative product by blowing a block of corrugated plates at atmospheric pressure with a stream of dried and decarbonized air or inert gas (nitrogen) at a temperature of from 20 ° C to 160 ° C for 0.5 to 2.0 hours ensures the production of a product with specified geometric parameters and high mechanical strength due to the removal of internal stresses arising during the molding of the product. At the same time, stabilization of the regenerative product is achieved by removing residual moisture from incompletely decomposed crystalline hydrates, which ensures long-term storage of the regenerative product and products based on them without compromising quality.

The formation of the regenerative product in the form of corrugated plates with the location of the longitudinal axes of the corrugations at an angle from 5 ° to 45 ° to the longitudinal axis of the plate provides the creation of a three-dimensional block structure with minimal aerodynamic drag.

Carrying out the trimming of the plates along the contour to the size of the block in the projection "top view" after molding the regenerative product in the form of corrugated plates ensures the elimination of changes in the geometrical dimensions of the plates during molding.

The manufacture of an inert gas-permeable shell on the side surface of the block by winding several layers of an inert gas-permeable material such as glass paper onto a package of plates ensures fixing of the regenerative plates in the block regardless of the number and size of the plates and the removal of the regenerated gas-air mixture (DHW) from the peripheral part of the block during the regeneration process.

The use of a forming corrugating tool from materials that are inert to the regenerative product, preferably from fluoroplastic or stainless steel, ensures operational safety, long-term use of the tool, the possibility of cleaning and washing it after work, and eliminates corrosion of the tool, the products of which have a catalytic effect on the regenerative product, leading to its decomposition.

The formation of the regenerative product in the form of plates with the arrangement of corrugations at an angle to the longitudinal axis of the plate provides high operational properties of the regenerative product: high mechanical strength and minimal aerodynamic resistance when assembling the plates of the regenerative product in a package with mirror-like overlapping of the plates.

Below is one of the options for the hardware implementation of the proposed method.

The drawings show:

in FIG. 1 - initial procurement, plan view; in FIG.

2 is the same as in FIG. 1, side view;

in FIG. 3 is a flow chart of molding a regenerative product (callout I of FIG. 8);

in FIG. 4 shows a corrugated plate of a regenerative product;

in FIG. 5 is the same as in FIG. 4 upside down;

in FIG. 6 - shows the relative position of the corrugations of adjacent regenerative plates, top view;

in FIG. 7 is the same as in FIG. 6 with an intermediate flat sheet of a regenerative product, top view;

in FIG. 8 shows a device for molding a regenerative product in the form of corrugated plates with reduced forming organs, front view;

in FIG. 9 is the same as in FIG. 8 is a diagram for diluted forming bodies;

in FIG. 10 is a top view of an assembled regenerative unit with a rounded shape of corrugations;

in FIG. 11 is the same as in FIG. 10 when installing intermediate flat plates;

in FIG. 12 is a top view of an assembled regenerative unit with straight corrugations;

in FIG. 13 is the same as in FIG. 12 when installing intermediate flat plates;

in FIG. 14 is a flow chart of forming a package of plates of a regenerative product after cutting the plates along the contour;

in FIG. 15 is the same as in FIG. 14, the position of the flat plate stack before molding is shown.

The list of items indicated in the drawings:

1 - blank;

2 - forming tool;

3 - plate package;

4 - regenerative unit;

5 - corrugated plate “right”;

6 - corrugated plate "left";

7 - shell;

8 - the plate is flat;

9 - top plate;

10 - bottom plate;

11 - drive;

12 - press body.

The method is as follows. The initial regenerative product containing a reinforcing material in the form of a mat or tape is cut into blanks 1 and subjected to molding by exposure to a forming tool 2 at a specific pressure of 10 to 60 MPa, followed by exposure to a working pressure of 0.15 to 5 minutes per single the blank 1 or the plate pack 3, after which the regenerative block 4 is assembled by laying the corrugated plates 5 and 6 on top of each other, while the plates are turned over one after laying so that the corrugations do not coincide, after which they conclude the side surface into the shell 7 and carry out thermal stabilization of the product by blowing the block at atmospheric pressure with a stream of dried and decarbonized air or inert gas at a temperature of from 20 to 160 ° C for from 0.5 to 2.0 hours. The regenerative product is formed in the form of corrugated plates 5 with the arrangement of corrugations at an angle to the longitudinal axis of the plate from 5 ° to 45 °. Between the corrugated plates, if it is necessary to increase the protective action time of the regenerative cartridge, flat plates 8 are placed. In this case, the angle of inclination of the corrugations is chosen to be minimal, and the height of the corrugations is chosen to be maximum. After molding, the plates are trimmed along the contour to block sizes 4. Shell 7 of block 4 is carried out by winding several layers of glass paper such as BMD-F or BMD-K. Formation of the regenerative product is carried out by a forming tool 2 from a material inert to the regenerative product, preferably from F-4 fluoroplastic or stainless steel.

The resulting regenerative product in the form of an enclosed package of plates is fed to the equipment of the cartridges of insulating breathing apparatus.

The main indicators of the health of a regenerative product are the time of protective action (VZD), breathing resistance and mechanical strength. They depend on a number of factors, the main of which are the thickness of the corrugated plate and the height of the corrugations.

The following are examples of specific implementations of the proposed method.

Example 1

The initial regenerative product in the form of a ribbon with a thickness of 3.6 mm in the amount of 4 pieces was cut into rectangular blanks of size 100 × 150 mm, placed in a molding press and subjected to molding by a corrugating tool with a corrugation height of 2 mm at room temperature under a pressure of 60 MPa for 10 minutes.

After extraction, the corrugated sheet was placed in a heating cabinet, in which it was held for 20 minutes at a temperature of 128 ± 5 ° C and, after cooling in a sealed container, was cut along the contour to the specified dimensions. Corrugated plates of 110 × 86 mm in size with a total thickness of 6 mm and a chemically bound oxygen content of at least 20% of the mass were obtained.

Then, the block was assembled from corrugated plates by imposing them on each other in the amount of 16 pieces, while the plates during installation were oriented so that the longitudinal axis of the corrugations in the “top view” projection intersected each other, and the block plates were fixed by winding onto its lateral surface of glass paper BMD-K in 4 layers.

The resulting block was fed to the equipment of the regenerative cartridge, which, after assembly, was tested on a vibration bench, on which mechanical strength was determined (by the absence of dusting during purging), and then, as part of the breathing apparatus, they were tested on an IL device (artificial lungs) to determine breathing resistance on various modes and time of protective action.

Results. The protective action time was 24 minutes. The maximum value of breathing resistance did not exceed 40 mm of water. Art.

According to the test results of this block and other blocks, the optimal manufacturing conditions of the regenerative product were determined.

Example 2

The initial regenerative product in the form of a 2 mm thick ribbon in the amount of 4 pieces was cut into rectangular billets 100 × 150 mm in size, placed in a molding press and subjected to molding by a corrugating tool with a corrugation height of 1.5 mm under a pressure of 11 MPa for 12 min. After that, the heating of the forming plates was turned on and kept for 20 minutes at a temperature of 140 ± 5 ° C and, after cooling, they were cut along the contour of the forming plates to the specified sizes. Corrugated plates with a size of 110 × 86 mm with a total thickness of 5 mm and a chemically bound oxygen content of at least 21% of the mass were obtained.

Then, the block was assembled from corrugated plates by applying them to each other in an amount of 18 pieces, as in Example 1. Fixing of the block plates was carried out by winding 5 layers of BMD-F glass paper on its side surface.

The resulting block was subjected to tests similar to those described in example 1. Results. The protective action time was 26 minutes. The maximum value of breathing resistance did not exceed 38 mm of water. Art.

According to the test results of this block and other blocks, the optimal manufacturing conditions of the regenerative product were determined.

Example 3

The initial regenerative product in the form of a ribbon of 3.6 mm thickness in the amount of 4 pieces was cut into rectangular blanks of size 100 × 150 mm, placed in a molding press and subjected to molding by a corrugating tool with a corrugation height of 2 mm at room temperature under a pressure of 60 MPa for 10 min

After extraction, the corrugated sheet was cut along the contour to the specified size. Corrugated plates of 110 × 86 mm in size with a total thickness of 6 mm and a chemically bound oxygen content of at least 20% of the mass were obtained.

Then made the assembly of the block of corrugated plates by superimposing them on top of each other in the amount of 16 pieces, as in example 1.

The resulting block was fed to the equipment of a regenerative cartridge, which, after assembly, was purged at atmospheric pressure with a stream of dried and decarbonized air at a temperature of 150 ± 5 ° С for 1 h and subjected to tests on a vibration stand and an IL apparatus, as in example 1.

Results. The protective action time was 22 minutes. The maximum value of breathing resistance did not exceed 42 mm of water. Art.

According to the test results of this block and other blocks, the optimal manufacturing conditions of the regenerative product were determined.

The proposed method is simple in hardware design and operation and provides plates of a structured regenerative product with minimal aerodynamic drag, with an optimal content of chemically bound oxygen in the product.

Claims (4)

1. A method of manufacturing a block regenerative product, comprising processing the initial regenerative product in the form of a tape containing a reinforcing material impregnated with an active component in the form of an alkali metal superoxide, preferably potassium or sodium, by exposing it to a forming corrugating tool in a mold followed by thermal stabilization characterized in that the initial regenerative product is pre-cut into preforms of a predominantly rectangular shape, the preforms are folded into bag and subjected to a package of blanks molding corrugating tool at a specific pressure of from 10.0 to 60.0 MPa, followed by exposure to pressure for from 0.15 to 5 minutes to obtain corrugated plates, after which the assembly of the block from the corrugated plates by applying them at the same time, the plates, either even or odd, are oriented when laying so that the longitudinal axis of the corrugations in the “top view” projection intersect with each other with the longitudinal axis of the corrugations at an angle of 5 to 45 ° to the longitudinal axis of the plate, and fixing the block plates by applying an inert gas-permeable shell to its lateral surface, after which the regenerative product is thermally stabilized by blowing the block of corrugated plates at atmospheric pressure with a stream of dried and decarbonized air or inert gas at a temperature of from 20 to 160 ° С for 0, 5 to 2.0 hours. 2. The method according to p. 1, characterized in that after molding the regenerative product in the form of corrugated plates, the plates are trimmed along the contour to the dimensions of the block in the projection "top view". 3. The method according to p. 1, characterized in that the inert gas-permeable shell on the side surface of the block is formed by winding on it several layers of glass paper. 4. The method according to p. 1, characterized in that the molding of the regenerative product is carried out by a forming corrugating tool from a material inert to the regenerative product, preferably from fluoroplastic or stainless steel.

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