The method of monitoring of aerosol pollution gases supplied to the temperature control of launch vehicles and spacecraft on the launch pad, and the system for its implementation

 

The invention relates to techniques for sampling and control of mechanical impurities in the air and gas environments and can find application in aerospace, gas, nuclear, chemical and other industries. In the method are selected gas from the main pipeline at an equal linear velocity of flow in the cross section of the gas main pipeline and the input aperture of the probe. Let the gas through the probe and a sampling tube to the sampling nozzle. At the entrance to the pipe taking gas in the analyzer and in the bypass line at equal linear speeds of flow. After selected tubes at the same time reduce the speed and pressure of gas to their specified values at the entrance to the sampling pipe and the analyzer. The gas analyzer and the temperature control down to the analyzer through the probe and a sampling tube on a single channel. The temperature of the analyzer is carried out on the bypass line by blowing. Then thermostatic and analyzed gas discharged into the atmosphere. The system for implementing the method comprises a probe, a sampling tube, the locking element, the conical chamber and coaxially placed in it with the possibility of axial movement of the sampling tube, the analyzer by pressing the wall of the hole and installed coupled with him a large base of the conical chamber. On one of the side walls is made technological hatch with close fitting to the body of the box lid. On the other walls are made razobratsya holes, provided with a protective casing with perforations. The invention provides a representative sampling, accuracy and reliability. 2 C. p. F.-ly, 3 ill.

The invention relates to techniques for sampling and control of mechanical impurities in the air and gas environments and can be used for continuous monitoring - monitoring of purity used in the rocket-space technology gas transported through pipelines to a temperature compartments launch vehicles and spacecraft on the launch pad, as well as in gas, nuclear, chemical and other industries.

Carrying out such control of the purity of the gases in the rocket-space technology is provided in order to ensure reliable and trouble-free operation of airborne equipment launch vehicles and spacecraft, in particular optical and sensing elements of the devices, solar panels and electronic components operating in an open to the x, according to disperse composition and mass concentration of particulate matter set by the standards of GOST R 50555-93 Classes purity gases, GOST R 50766-95 “Premises clean. The classification. Methods of assessment”. Federal U.S. standard Classes of cleanliness for airborne particles in clean rooms and clean zones” FED-STD-209E, 1992 etc.

However, the lack of normative-technical documentation on the use of funds and monitoring systems of purity gases with the required technical and operational characteristics for a wide industrial use, acknowledges the specific relevance of this direction.

The known method of selection of gases, which consists in the removal of gas from the pipeline through the probe and a sampling tube to the analysisfor the device, as is used, for example, analytic filter, sedimentation column, photoelectric counter (USSR author's certificate No. 180411, CL G 01 N 1/22, 1963).

However, since the efficiency analysisfor devices are provided only at low speeds of the sample gas, the method and the corresponding device is not ensured equality of the velocities of the dispersed environment in selected t is Oh, at low speeds the sample gas is the deposition of impurities in the selected tube. All this greatly affects the representativeness of the sample and reduces the accuracy of the analysis in this way.

There is also known a method of selection of the gas, including a gas supply from the pipeline through the probe and a sampling tube to the analyzer and in the bypass line, and in the process of sampling the gas flow rate is adjusted so that the linear velocity in the selected tube and in the trunk pipeline were equal (GOST 3022-70).

Using this technique, you can achieve a higher accuracy of the analysis of gases in comparison with other known methods.

The method is carried out by a device comprising a probe, a sampling tube, a regulating valve and the analyzer.

The disadvantage of this method and the corresponding device is the inability to obtain isokinetic movement mode dispersion medium in the analysisfor and bypass lines. In violation of the isokinetic concentration of the selected particles will not be equal to the concentration of the dispersion medium in the flow, so the analyzed gas sample will not be representative. When neosocialism samples have the following CL is the linear velocity of the gas at the entrance to the analysisfor the device is longer than the linear velocity of the gas in the selected tube. In the first case, the disperse medium is asserted before entering the analysisfor device and the result is an underestimation of the concentration of particles in the sample. In the second case, the overestimation of the concentration of the particles with respect to particle concentration in the gas stream.

The known method of gas sampling and device for its implementation under the patent USSR No. 819613, CL G 01 N 1/22, 1978, in which increasing the representativeness of the sample is achieved by the fact that the gas down in the bypass line and to the input of the analyzer at equal linear speeds. The device includes a probe, a sampling tube, and control valves. Selected tube in the output has a tapered camera installed therein coaxial with the ability to move the sampling pipe, coupled with the analyzer.

To ensure isokinetic conditions sampling ensure the equality of the linear gas velocity at the entrance analysisfor device and the linear velocity of gas discharged into the bypass line, which will not be of the curvature of the streamlines.

For a given constant flow of gas through the analyzer and variable in a wide range of linear velocity of the gas in the selected tube depending on the linear gas velocity in the main pipe is>/p>The system of gas samples for analysis by this method is shown in the book: Baibakov F.B., Sharapov, C. M. Control of impurities in compressed gases. - M.: Chemistry, 1989. - 160 S., S. 27-29, 141, 142.

The method of gas sampling and device for its implementation in patent No. 819613 allow you to take accurate samples of gases from process piping under pressure, and thereby significantly improve the accuracy of control of purity gases.

The disadvantages of this method and the corresponding device is unproductive gas flow through the bypass line, which is many times greater than the gas flow analysis.

In addition, since the analyzer is located directly next to the sampling device, which in turn is placed in the area of technological pipeline, the analyzer is exposed to the environment (temperature, humidity, precipitation, wind loads), which negatively affects the accuracy of the measurement.

It is also known a device for sampling gases high pressure RF patent No. 2152017, CL G 01 N 1/22, 1998, containing the probe, sample tubing, control valves, conical chamber and the analyzer samples, with conical chamber open at the base (the foster patent No. 819613).

Device according to patent No. 2152017 provides for operation of the system temperature high pressure air launch vehicles and spacecraft on the launch pad required functionality.

The disadvantages of this device also includes unproductive gas flow through the bypass line and the impact of the environment on the analyzer when using the device in the field, which reduces its technical and operational characteristics of efficiency, representativeness of sampling, accuracy, reliability.

In addition, the known method and device for sampling gases by RF patent No. 2158421, CL G 01 N 1/22, 1999, containing the probe, sample tube, conical chamber with an open base and sampling pipe and the analyzer sample (working principle and the design is also based on the method of sampling and device for its implementation in patent No. 819613). Method and device for sampling gases in patent No. 2158421 implemented to monitor the purity of thermostatic low pressure air that is closest to the present invention to the technical essence and the achieved result and selected as a prototype.

The disadvantages, in case of strong wind flows in the atmosphere possible pressurization of the open part of the conical chamber and the violation of the stationarity of the flow of gas, which leads to a sharp decrease in isokinetic sampling and the representativeness and accuracy of control. Also the necessary protection of the analyzer from the effects of the environment and improvement of technical and operational characteristics.

The objective of the invention is the improvement of technical and operational characteristics, namely efficiency, representativeness of sampling, accuracy and reliability of control and easy operation.

The required technical result is achieved in that in the method of monitoring of aerosol pollution gases, including the selection of the gas from the main pipeline at an equal linear velocity of gas in the trunk pipeline and the input aperture of the probe, a gas supply through the probe and a sampling tube to the sampling inlet, at the entrance of which withdraws gas in the analyzer and in the bypass line at equal linear speeds of flow, after the selected tube at the same time reduce the speed and pressure of gas to their specified values at the entrance to proposala the Yu tube single channel, at this point analyzer is carried out on the bypass line by blowing, then thermostatic and analyzed gas discharged into the atmosphere. In addition, the system for its implementation, containing a probe, a sampling tube, the locking element, the conical chamber and coaxially placed in it with the possibility of axial movement of the sampling tube, the analyzer and the bypass line equipped containing within itself the analyzer box, on the upper horizontal wall of the hole and installed coupled with him a large base of the conical chamber, on one of the side walls is made technological hatch with close fitting to the body of the box lid, and on the other walls are made razobratsya holes, provided with a protective casing with perforations.

Authors unknown solutions from the essential features listed in the characterizing part of the claims.

The invention is illustrated by drawings, where

in Fig.1 - distribution of the flow near the hole sampling pipe in the following cases:

a - the linear velocity of the gas inlet sampling tube is less than the linear velocity of the gas in the selected tube is ubke;

in the linear velocity of the gas at the entrance to the sampling nozzle is equal to the linear velocity of the gas in the selected tube, and the linear velocity of gas discharged into the bypass line;

in Fig.2 diagram and device selection of gas from the pipeline through the probe and a sampling tube to the sampling device, the analyzer and the box;

in Fig.3 - wiring diagram and the design of the sample, the analyzer and the cold box.

The method of monitoring of aerosol pollution gases supplied to the temperature control of launch vehicles and spacecraft on the launch pad, as follows.

Produce a selection of gas from the main pipeline at an equal speed two-phase flow of gas and solid particles in the cross-section selection in the trunk pipeline and the input aperture of the probe, when the gas down through the probe and a sampling tube to the sampling inlet, at the entrance of which withdraws gas in the analyzer and in the bypass line at equal linear velocities (Fig.1). After selected tubes at the same time reduce the speed and pressure of gas to their specified values at the entrance to the sampling pipe and the analyzer, and gas for analysis and thermostatization exercise of the bypass line by blowing, then thermostatic and analyzed gas discharged into the atmosphere.

To implement this method, monitoring of aerosol pollution gases proposes a system of monitoring of aerosol pollution gases supplied through the main pipeline 1 (Fig.2) connected through the side plug connection 2, for ventilation and temperature control boosters 3 and spacecraft 4, which contains a device for sampling and analysis of gas samples installed on the service tower booster 3 and consisting of a probe 5, selected tube 6, the locking element - flow ball valve 7 (Fig.3), the conical chamber 8 with a small cone angle (15), an open base and placed coaxially with the possibility of axial movement sampling pipe 9, the analyzer 10 and the bypass line 11.

The inlet probe 5 facing towards the incident gas flow in the main pipeline 1.

The monitoring system is equipped with a thermal container 12, the analyzer 10 is placed inside of the box 12 and connected to the sampling pipe 9 Flex 13, on the upper horizontal wall 14 of the box is made to 16 technological hatch with a tight box with a lid 17, where there is a viewing device 18. On the other walls are made razobratsya holes 19, provided with a protective casing 20 with perforations 21, representing a plate with tiny holes or filters. The analyzer 10 is connected remotely by a communication cable 22 with a personal electronic computing machine 23.

The proposed method of monitoring of aerosol pollution gases implement this system in the following way. When the open ball gate 7 thermostatic gas are taken at equal flow velocity in the cross section of the gas in the main pipe 1 - VGand in the input hole probe 5-VCRwhen the gas is lead through a tube 5 and a sampling tube 6, the rotary valve 7 into the conical chamber 8 to the sampling pipe 9, at the entrance of which withdraws gas analyzer and the bypass line at equal linear velocities Va=VCR=Vb(Fig.1B). After a selected tube in the conical chamber is expanding a gas stream, reducing the velocity VCRand the gas pressure PCRto the values specified at the entrance to the sampling pipe 9 and the analyzer 10.

Depending on the mode - performance gas flow for temperature control and, meet aemula through the probe and a sampling tube VCR. Then, taking into account the specified gas flow through the analyzer (Va=const) and the flow rate in the bypass line, which ensures the equality VCR=Vg, move sampling pipe 9 in the axial direction to such a cross-section of the conical chamber 8, in which the ratio of the areas of their passage sections Sa/Sbensures the equality of the linear velocities at the analyzer input and the bypass line Vand=Vb. The amount of movement sampling pipe L with respect to the conical chamber is determined by the nomogram, graphics or table and is controlled by a special scale printed directly on the sampling pipe.

The smaller the flow rate or the gas flow in the main pipe 1, the higher must be installed sampling pipe 9 into the conical chamber 8, and Vice versa, the higher the speed or the flow rate, the lower. Due to the fact that sampling pipe 9 is made with the possibility of axial movement in a conical chamber 8, is provided the opportunity to control the content of dispersed particles in a wide range of costs and velocity of the gas in the main pipe 1.

The gas discharged from the sampling device anera 12, blows located inside the analyzer 10 and thermostatical it. Exhaust gas through razobratsya holes 19 of the box 12 and the protective casing 20 with perforations 21 is discharged into the atmosphere.

System monitoring of aerosol pollution is mainly to control the purity of the air in the air temperature control system (see, for example, aerial application (SOTR) in kN. The spaceport. Under the General Ed. by A. P. Wolski. M: Voenizdat, 1977. - 309 S., S. 202-213). Controlling for other gas environments exhaust gas after exiting through razobratsya holes 19 of the box 12 can be discharged for reuse in a closed loop.

The gas flowing through the sampling pipe 9 and a flexible conduit 13 to the input of the analyzer 10 - opto-electronic aerosol counter OEAS-05 pumped with a given flow rate through the measuring chamber. When this dispersed aerosol particles cross the illuminated light beam of the measuring volume. The light pulses reflected from the dispersed particles detectable by a photodetector and converted into electrical pulses, the amplitude of which is proportional to the size of the particles, at the same time is scheu number concentration of dispersed particles in the temperature control of launch vehicles and spacecraft in preparation to start continuously displayed on a digital display of the analyzer 10, and simultaneously transmitted remotely via the communication cable 22 to a personal electronic computer 23 located at the point of remote monitoring and control, where it is processed by means of software, is displayed on the screen of the monitor 24 and documented.

Using a range of sampling devices and analyzers placed in the cold box, the monitoring system provides continuous, simultaneous multi-channel remote control of the purity of the heating and cooling of the gases supplied through the various pipelines. When this is measured and recorded aerosol particles in the heating and cooling gases with sizes

from 0.3 μm or more;

from 0.5 μm or more;

5.0 microns, and more

in the range of number concentration from 1 to 3.5104particles/DM3.

When operating in remote mode provides:

- displays changes in number concentration of particles on the screen during the measurement in real time;

- displaying on the monitor screen tables and graphs of values of the number concentration of particles in the sub-bands of their size;

- storing of measurement results on the magnetic disk;

conclusion the results of the

Proposed invention the combination of features allows you to get a substantial positive effect - improvement of technical and operational characteristics, namely efficiency, representativeness of sampling, accuracy and reliability of control and easy operation.

The invention is used in full when creating a system for monitoring parameters of air SMV supplied to ensure the temperature regime of launch vehicles and spacecraft on the launch pad of the Baikonur cosmodrome.

Claims

1. The method of monitoring of aerosol pollution gases supplied to the temperature control of launch vehicles and spacecraft on the launch pad, including the selection of gas from the main pipeline at an equal linear velocity of flow in the cross section of the gas main pipeline and the input aperture of the probe, a gas supply through the probe and a sampling tube to the sampling inlet, at the entrance of which withdraws gas in the analyzer and in the bypass line at equal linear speeds of flow, characterized in that after the selected tube at the same time reduce the speed and pressure of gas to their specified values is through the probe and a sampling tube single channel, at this point analyzer is carried out on the bypass line by blowing, then thermostatic and analyzed gases discharged into the atmosphere.

2. System monitoring of aerosol pollution gases supplied to the temperature control of launch vehicles and spacecraft on the launch pad containing a probe, a sampling tube, the locking element, the conical chamber and coaxially placed in it with the possibility of axial movement of the sampling tube, the analyzer and the bypass line, characterized in that it is provided containing within itself the analyzer box, on the upper horizontal wall of the hole and installed coupled with him a large base of the conical chamber, on one of the side walls is made technological hatch with close fitting to the body of the box lid, and on the other walls are made razobratsya holes, provided with a protective casing with perforations.

 

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