RU2482929C2 - Method of cleaning equipment of explosive powder - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to rocketry, particularly, safe cleaning of equipment at the line feeding explosive powder into mixers. Proposed method comprises feeding water at the rate of 300-400 l/h for 10 minutes from hopper located above vaned feeder equipped with irrigation system communicated via remote-control valve with main pipeline. Simultaneously with water feed, vaned feeder and separator are cut in by remote means. Vacuum valve is opened to make irrigation. Then, separator and vacuum valve hard-to-access areas are additionally flushed by water jet through relief openings and flushing waters are collected in mixer bowl for them to be decontaminated.

EFFECT: higher safety, lower costs.

1 tbl, 1 dwg

Description

The invention relates to the field of rocketry, and in particular to the development of a process for the safe cleaning of equipment on the line for loading powdered explosives (BB) into mixing equipment.

In patent RU No. 2272801, IPC С06В 21/00, the technological scheme of the equipment is shown on the line for loading powdered explosive into mixing equipment.

Known methods for cleaning equipment described in patents RU No. 2229949 and No. 2407603, which discusses the cleaning of mixing equipment from viscous explosive compositions, without touching equipment on the loading line of explosives. At the same time, several drawbacks should be noted: the duration of the process due to the two-stage process - in the first stage, cleaning with an inert composition based on potassium chloride and a mixture of rubber with technological additives, and in the second stage with a cleaning composition based on crushed rubber, mineral oil and a surfactant . Crushed rubber requires special training. In addition, at the end of the process, additional cleaning of the walls of the equipment from residues of inert components is required. The final operation for processing the phase generated from the mixer after the first and second stages of cleaning is not indicated. As a prototype, patent RU No. 2229949, IPC B08B 9/027, application no. 05/20/2003, publ. 06/10/2004.

Almost water-insoluble explosives, which include octogen, hexogen, etc., are able to accumulate static electricity. In this case, the arising electric forces lead to adhesion of the explosive particles to the walls and working bodies of the equipment and subsequent layering due to autogyzic forces. For fine particles, the effect of capillary forces upon moisture adsorption is also not excluded.

An object of the invention is the development of an economically cheap, safe method of cleaning from adhering explosives to the walls of equipment, mass pipelines, hoses in the line of loading powdered explosives into the mixer, followed by disposal.

The technical result of cleaning equipment from adhering explosive to the walls of the equipment on the supply line to the mixing equipment is achieved by supplying water with a capacity of 300-400 l / h for up to 10 minutes from a hopper installed above the blade feeder with an irrigation system connected to the main water supply through remotely controlled valve, simultaneously with the water supply remotely turn on the blade feeder, separator, open the vacuum valve and carry out irrigation, then the separator is washed water through it from the hose expelling windows and sunroof inaccessible through the vacuum valve seat with the collection of wash water in a bowl mixer followed by neutralization of the explosive.

The essence of the invention lies in the method of cleaning from adherent explosives on the walls of the equipment in the line of loading it into the mixer by supplying irrigated water throughout the tract. The possibility of implementing this method is ensured by the exclusion of the manifestation of electric and capillary forces between the explosive particles with excess water, and also due to the impact of shock and shear on the adhering layer during the passage of the water flow.

The drawing shows an existing line for loading explosives into mixing equipment with the addition of a water supply circuit for cleaning equipment on this line. Install a clean mixer bowl (9). The paddle feeder (4) is joined with the hopper (3), in the upper part of which a shower (1) is installed, connected to the main water supply via a remotely controlled valve (2). Remotely turn on the water supply, at the same time remotely turn on the blade feeder (4), which provides a water supply capacity of 300-400 l / h, a separator (7), open the vacuum valve (8). Water irrigation of the supply path of explosives to the mixer is carried out for up to 10 minutes With greater productivity, the bin will accumulate and overfill with water. At lower productivity, there will be incomplete irrigation of the walls of the apparatus, mass pipelines, hoses (5). After remote washing with water, increased relative humidity is created in the cavity of the apparatus, the mass pipe and the hoses. At the same time, the explosive ability to electrify and sensitivity to an electric spark are reduced, which reduces the danger during further operations during cleaning. Next, remove the covers from the knockout windows (6) of the separator. Water supply from a hose is made by places not accessible during irrigation. From the hose with a stream of water through the hatch (10), the places of the dead zones of the vacuum valve are washed.

Flushing water is collected in a mixer bowl, from which it is sent for neutralization from explosives.

The surface area of the equipment, including the working bodies to be cleaned, is shown in the table.

Table Equipment Parameters. Item Number Device name Surface area, dm ² four Hazardous feeder 106.5 7 Separator 180.5 8 Vacuum valve 108 5 Sleeve 65.3 Sleeve between the separator and 78.5 vacuum valve

The paddle feeder serves to supply a product whose performance depends on the speed and volume of the cell. With a tuned performance when dispensing a product with a given rotation speed of 1.5-2 rpm and a known cell volume of 0.4 dm ^{3, the} calculated water flow rate will be

(1.5 ÷ 2) × (0.4 × 8) × 60 = 288 ÷ 360 dm ³ / hour = 288 ÷ 360 l / hour,

Where

1,5 ÷ 2 - the number of revolutions per minute,

0.4 - cell volume,

8 - the number of cells,

60 - time, minutes per hour.

Actual productivity will be at the level of 300-400 l / h due to water leaks through the permissible gaps in the paddle feeder. Tests have shown that the washing off of the adhering layer of explosives occurs in 7-8 and 10 minutes, respectively, with a water delivery rate of 400 and 300 l / h. Intensification of the cleaning of the separator having the maximum surface area occurs due to an additional disturbing vibration factor.

The proposed method of cleaning equipment from powdered explosives was tested with a positive result in the conditions of production at the Perm Perm Powder Plant.

Claims (1)

A method of cleaning equipment from powdered explosives on the supply line to the mixer, comprising supplying water with a capacity of 300-400 l / h for up to 10 minutes from a hopper mounted above the blade feeder with an irrigation system connected to the main water supply via a remotely controlled valve, simultaneously with water supply remotely turn on the blade feeder, the separator, open the vacuum valve and carry out irrigation, then the separator is blown with a stream of water from the hose through the baffle windows and is not accessible through the hatch places of the vacuum valve with the collection of wash water in the mixer bowl, followed by their disposal from explosives.

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