Method of pneumatic transportation of powder-like oxiddizer

FIELD: material handling facilities; pneumatic transportation.

SUBSTANCE: according to invention, tightness of pneumatic transportation plant is checked before starting and periodically in process of operation by creating vacuum gauge pressure of at least 0.08 MPa in pipeline and air line by vacuum pump, and residual pressure not higher than 0.02 MPa in unloader with subsequent revealing degree of air suction after closing of evacuation line. Reduction of vacuum gauge pressure in 10 min in pipeline should not exceed 0.005 MPa and in air line, not exceed 0.02 Mpa and rise of residual pressure in unloader should not exceed 0.0025 MPa in 5 min.

EFFECT: provision of reliable tightness of system and drying the system before starting and in process of operation.

3 cl, 1 tbl, 4 dwg

 

The invention relates to the field of pneumatic conveying of powder materials. It can be used in many industries.

The pneumatic installation are widely used for transportation of powder materials. Pneumatic transportation used in the manufacture of composite solid rocket fuel (STRT) for the interfacial transfer of powdery oxidizing agent. Powdered oxidant (ON) is used in the form of a mixture of fractions without additives or with the introduction of additional components (BELOW). Description of the used circuits and equipment pneumatic transportation is given in the author's book Urban "Pneumatic transport, machine building, Moscow, 1967, Both in this book and in numerous patent sources and technical literature focuses on the ways power piping material separation and transportation process.

The known method of pneumatic conveying of powdered oxidant additives, including supply of dried compressed air with a moisture content of 0.8 g/m3in aerocamera with adjustable temperature and pressure with the subsequent passage of air through the pipeline in razgruzitel, cyclones, air duct, wet the filter at the suction of the vacuum pump (patent RF 220250 from 20.04.2003, adopted for the prototype - 1).

In this way the hallmarks mainly deal of prior preparation transported UNDER and modes of transportation. However, in view of the specific requirements and UNDER the safety of their physico-chemical properties, as well as sustainable uptime for the operation of subsequent operations on the production START has very strict requirements to the pneumatic installation.

These include: maintaining a constant concentration of the mixture, the exclusion of air leaks, no traces of moisture on the inner walls of the equipment and transport communications.

In the prototype shown only way to check the tightness of the plant that is not enough.

Pneumotransport installation consists of a series of interconnected pipes and ducts of the apparatus. Therefore, special attention should be paid to ensure reliable sealing of all parts of the pneumatic installation prior to start-up and during operation.

The technical purpose of this invention is the provision of a reliable tightness, performing operations on the drying system the pneumatic installation.

The technical result is achieved due to the fact that the dried compressed air is controlled is the temperature and pressure with a moisture content of 0.8 g/m 3served in aerocamera with the subsequent passage of air through the pipeline in razgruzitel, cyclones, vandakurov, wet the filter at the suction of the vacuum pump. Thus before starting and periodically during operation of the pneumatic installation check the tightness by creating the vacuum pump in the piping and duct VacuumTechExpo pressure not less than 0.08 MPa, razgruzitel a residual pressure of not more than 0.02 MPa with subsequent determination of the degree of air leaks after closing the vacuum line, thus reducing VacuumTechExpo pressure should be 10 minutes in the pipe not more than 0.005 MPa, in the duct is not more than 0.02 MPa, and the increase of the residual pressure in razgruzitel not more than 0,0025 MPa for 5 minutes.

Before commissioning and before shipment and are UNDER pipeline blowdown disconnecting it from razgruzitel and connecting to cyclone dried with compressed air with a moisture content of not more than 0.8 g/m3and a pressure of from 0.25 to 0.35 MPa (2.5 to 3.5 kgf/cm2in a period of not less than 2xhours.

Before transportation and UNDER the conduct purge pipeline through razgruzitel and the cyclone with the conclusion in the atmosphere of compressed dried air under the same settings heated to a temperature of from 20 to 40°and from 40 to 60°when the temperature is ur ambient air, respectively, above and below -20° C for 2.5 to 3.5 hours, and the whole system of pneumatic transport installation with included vacuum pump for 1.5 hours.

Before start-up and periodically during operation of the pneumatic installation inspect the tightness of the main equipment, piping, duct pneumatic conveying installation for tightness rationing indicators VacuumTechExpo or residual pressure.

Options when checking the tightness of the unit shown in the table.

Table
The name of the nodeThe generated pressure, MPa (kgf/cm2)Valid reduction VacuumTechExpo pressure, MPa (kgf/cm2)The allowable increase in residual pressure, MPa (kgf/cm2)The period was mentioned test
ValuemetricsResidual
PipelineNot less than 0.08(0,8)-Not more than 0.005 (0.05) in the course of 10 min-At least once per month
The duct including a cyclone and wet filterNot less than 0.08(0,8)- Not more than 0.02(0,2) for 10 min-At least once in 6 months
Razgruzitel, including the device return-Not more than 0.02(0.2)-No more than 0,0025(0,025) for 5 minAt least once per year

The essence of the invention is illustrated by the following drawings.

1 shows a process diagram of the pneumatic transport installation, adopted as a prototype.

1 - handling device;

2 - zagrosian;

3 - rotary feeder;

4 - cleaning apparatus;

5 - aerocamera;

6 - pipe;

7 - razgruzitel;

8, 10, 15 - cyclones;

9 is a rotary shutter;

11 - duct;

12 - return valve;

13 - vacuum pump;

14 container;

16 - wet the filter.

Figure 2 shows a scheme for the implementation of the method for checking the tightness of the pipeline.

4 - cleaning apparatus;

5 - aerocamera;

6 - pipe;

7 - razgruzitel;

11 - duct;

17 - nozzle;

18 - valve;

19 - gauge.

Figure 3 shows the scheme for the implementation of the method for checking the tightness of the duct.

8 - cyclone;

11 - duct;

12 - return valve;

13 - vacuousness;

16 - wet filter;

18 - valve;

19 - gauge;

20 - for lusca.

Figure 4 shows a diagram for the method of checking the tightness of razgruzitel.

7 - razgruzitel;

8 - cyclone;

11 - duct;

18 - valve;

19 - gauge;

21 - discharge hatch razgruzitel;

22 - inlet pipe of razgruzitel.

Below is described a method for checking the tightness of the individual devices. For the leak test (figure 2) piping, disconnect it from aerocamera 5 and choke. From razgruzitel 7 disconnect the pipe 6 and it is connected to the insert, consisting of a pipe 17, valve 18, a cleaning device 4 and 19 gauge, to the other end of the insert is connected to the duct 11 to a vacuum pump. The system creates a vacuum pressure of not less than 0.08 MPa (of 0.8 kgf/cm2), close valve 18 and 19 gauge, record the drop in vacuum pressure, which must be not more than 0.005 MPa (0,05 kg/cm2within 10 minutes.

To check the tightness of the duct 11 (3), disconnect it from cyclone 8 device return and UNDER and choke flap 20. Between the vacuum pump 13 and the check valve 12 installing the insert with the gate 18 and 19 gauge. Turning on the vacuum pump creates a vacuum in the vacuum system to a pressure not less than 0.08 MPa (of 0.8 kgf/cm2and block the valve. Follow the decrease in vacuum is Alenia, which should not exceed 0.02 MPa (0.2 kgf/cm2within 10 minutes. Check the tightness of the duct is carried out before filling the wet filter 16 with water.

To check the tightness of razgruzitel 7 (figure 4) suppress his discharge Luke 21 and the inlet 22 to the outlet nozzle of the cyclone 8 device to return and UNDER connecting the insert to the valve 18 and vacuum gauge 19, the free end of the insert attached to the line 11 to a vacuum pump. When the vacuum pump in the system create a residual pressure of not more than 0.02 MPa (0.2 kgf/cm2and block the valve. Monitor the increase of the residual pressure, which should be no more than 0,0025 MPa (0,025 kg/cm2within 5 minutes.

In the further process operation performed periodically check the tightness of the specified nodes pneumatic transport installation: pipeline after each disassembly, but not less than once in three months, air duct after each disassembly, but not less than once in six months, razgruzitel at least once a year.

Technological complex for the production of STRT runs in a continuous manufacturing START up to 24 hours, after which performed a full clean installation and preparation for the next start. At the same time cleaning and preparing pneumotransport is based installation as an integral part of the technological complex in the following order.

Before starting and during operation before each run the pneumatic installation, the pipe 6 is connected with one side to aerocamera 5, and on the other hand, bypassing razgruzitel 7, to the line output of the air to atmosphere through the cyclone 15. Include compressed dry air in aerocamera 5 with an absolute humidity of not more than 0.8 g/m3if you adjust the pressure of 0.25 MPa (2.5 kgf/cm2) to 0.35 MPa (3.5 kgf/cm2and are blowing for a period of not less than 2xhours.

Then the pipeline 6 and the output line of the air in the atmosphere is connected to razgruzitel and through him the compressed dried air under the same parameters continue for 2.5 to 3.5 hours. When this air is heated to a temperature of from 20 to 40°and from 40 to 60°when the ambient air temperature (outside), respectively, above and below -20°C.

Further include a vacuum pump 13 and the purge continue with the above parameters of air for at least 1.5 hours. When this air passes throughout the system the pneumatic installation from aerocamera 5 to the vacuum pump 13, after which it is released into the atmosphere. When the vacuum pump 13, the valve 12 in the line output of the air in the atmosphere by vacuum closes and purging when not operating the vacuum pump due to excessive pressure opens.

Not bodymist drying system the pneumatic installation due to the fact, the presence of traces of moisture on the walls of the apparatus, piping, duct stick oxidant. This leads to disruption of the normal modes of transportation up to the blockage of the line, followed by cessation of the process.

To check the tightness of the pneumatic installation in General disconnect the pipe 6 from aerocamera 5 and choke, include a vacuum pump. This vacuum pressure in the line before included the vacuum pump should not be less than 0.08 MPa (of 0.8 kgf/cm2). Upon receipt of satisfactory results of the pipe 6 is connected to aerocamera 5 and the pneumatic unit is ready for transport and UNDER in the technological process of manufacturing STRT.

Way pneumatic transportation of the oxidant with the implementation of the features of the invention tested with positive results on the FSUE "Perm plant. After S.M. Kirov.

1. Way pneumatic conveying of powdered oxidizer, including the filing of dried compressed air having a controlled temperature and pressure with a moisture content of 0.8 g/m3in aerocamera with the subsequent passage of air through the pipeline in razgruzitel, cyclones, air duct, wet the filter at the suction of the vacuum pump, characterized in that before starting and periodically during exploits and pneumatic installation check the tightness by creating the vacuum pump in the piping and duct VacuumTechExpo pressure not less than 0.08 MPa, in razgruzitel a residual pressure of not more than 0.02 MPa with subsequent determination of the degree of air leaks after closing the vacuum line, thus reducing VacuumTechExpo pressure should be within 10 min in the pipe not more than 0.005 MPa, in the duct is not more than 0.02 MPa, and the increase of the residual pressure in razgruzitel not more than 0,0025 MPa for 5 minutes

2. The method according to claim 1, characterized in that prior to start-up and before each run the pneumatic installation in the pipeline dried submission aerocamera compressed dry air with a moisture content of not more than 0.8 g/m3and a pressure of from 0.25 to 0.35 MPa for at least 2 h, bypassing razgruzitel, and output into the atmosphere, and then continue blowing through razgruzitel also the conclusion in the atmosphere for 2.5 to 3.5 hours supply of hot air at a temperature of from 20 to 40 and 40 to 60°s when ambient temperatures, respectively, above and below -20°C.

3. The method according to claim 2, characterized in that additionally the entire system from aerocamera to the vacuum pump blow dried with compressed air at the same settings of the last and when the vacuum pump for at least 1.5 hours



 

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SUBSTANCE: according to invention, tightness of pneumatic transportation plant is checked before starting and periodically in process of operation by creating vacuum gauge pressure of at least 0.08 MPa in pipeline and air line by vacuum pump, and residual pressure not higher than 0.02 MPa in unloader with subsequent revealing degree of air suction after closing of evacuation line. Reduction of vacuum gauge pressure in 10 min in pipeline should not exceed 0.005 MPa and in air line, not exceed 0.02 Mpa and rise of residual pressure in unloader should not exceed 0.0025 MPa in 5 min.

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