RU165909U1 - PORTABLE DEVICE FOR SAMPLING DUST AND GAS - Google Patents

Abstract

A portable device for sampling dust and gas, including a probe, a sampling tube connected to it and a sample analyzer, characterized in that it further comprises a syringe for sampling dust and gas, connected to a fitting of the sampling tube, which is made in the form of a L-shaped and inside and outside coated with refractory material, such as silica cloth, and placed in a rigid frame, with a groove for installing a removable cartridge with a ceramic filter in the upper part of the probe, and installed in the lower part of the probe and a refractory insert made of ceramic material.

Description

The utility model relates to analytical techniques, in particular to portable gas sampling devices, and can be used during the replacement of the anode of an aluminum electrolyzer to determine the composition of the exhaust gases on the surface of the electrolyte.

A device for sampling gas or condensate is known (RF patent No. 82332, publ. 04/20/2009), which contains inlet valves, high pressure containers and pressure and temperature sensors, characterized in that it contains two collectors, at the entrance of which diffusers with diverging radial and symmetrically spaced channels relative to each other, at the ends of which are mounted shut-off valves connected to the controller, controlling their closing and opening and recording data received from the combined in the nodes of measuring pressure and temperature sensors.

The disadvantage of this device is the inability to use it as a mobile analyzer because of the bulkiness.

A device for sampling gas with an admixture (RF patent No. 2190840, publ. 10.10.2002), which contains a sealed working container made in the form of a transparent tube with an impurity absorber inside. The tube is equipped with an inlet pipe for gas intake and an outlet pipe. The device has a means of forced pumping of gas, made in the form of a measured tight vessel filled with liquid, the inlet of which is connected to the outlet of the working capacity. The means of forced gas pumping has a fluid flow regulator, the inlet of which is connected to the outlet of the measuring vessel, and the outlet to the atmosphere. The fluid flow regulator is made in the form of a capillary tube. The inner diameter of the capillary tube is selected proportional to the volume of the sample taken and inversely proportional to the sampling time. The length of the capillary tube is proportional to the volume of the sample taken and proportional to the sampling time.

The disadvantage of this device is the presence of a transparent tube, which as a result of interaction with fluoride compounds of the waste electrolysis gases will dissolve. Also, the device is not designed to operate at elevated temperatures.

A device for sampling high pressure gases (RF patent No. 2193178, publ. 11/20/2002), which contains a probe coaxially placed in the gas pipe connected to the probe sampling tube with a shut-off valve, a throttle in the form of a combined nozzle. The nozzle consists of serially connected inlet, confuser, cylindrical and outlet diffuser parts. The device has a vertical composite conical chamber with the upper part passing into the diffuser part of the combined nozzle and the lower part. The device comprises a nozzle placed in a conical chamber with the possibility of axial movement, a sample analyzer and an additional chamber connected to the conical chamber.

This device is designed for stationary operation and gas sampling in pipes; its use as a mobile device for gas sampling in the production of aluminum is impossible due to its inability to high temperatures and the destructive effect of fluorides.

A device for sampling gases is known (RF patent No. 2158421, publ. 10/27/2000), adopted as a prototype containing a probe made in the form of a confuser, a sampling tube connected to a probe, a conical chamber, a sampling pipe and a sample analyzer. The sampling pipe is made in the form of a hollow cylinder with an inlet confuser with a taper angle. The sampling pipe has a handle mounted in its lower part, and a speed indicator. A plate is mounted vertically on the peripheral part of the lower base of the conical chamber with a flow velocity scale plotted along its height.

The disadvantage of this device is its inability to work with high-temperature gases of aluminum production. This device is designed for stationary operation of gas sampling in pipes and its use as a mobile device for gas sampling in aluminum production is impossible.

The technical result is the expansion of gas sampling capabilities, ensuring the reliability of the device due to less wear of the sampler materials as a result of the use of refractory materials.

The technical result is achieved by the fact that the device further comprises a syringe for sampling dust and gas, connected to the fitting of the sampling tube, which is made in the form of a L-shaped, and inside and outside covered with refractory material, for example, silica cloth, and placed in a rigid frame at the same time, a groove is made in the upper part of the probe for installing a removable cartridge with a ceramic filter, and a refractory insert made of ceramic material is installed in the lower part of the probe.

A portable device for sampling dust and gas is illustrated by the following figure:

FIG. 1 - portable device for sampling dust and gas, where:

1 - a probe made in the form of a conical nozzle;

2 - refractory insert;

3 - groove for installing a removable cartridge with a ceramic filter;

4 - ceramic filter;

5 - a syringe;

6 - sample analyzer;

7 - tee;

8 - sampling tube;

9, 10 - fitting;

11 - hard steel frame.

A portable device for sampling dust and gas consists of a probe 1 (Fig. 1), made in the form of a conical nozzle with a refractory insert 2 along the edge made of ceramic material, a groove 3 for installing a removable cartridge with a ceramic filter 4 for dust collection. The refractory insert is made in the form of a ceramic ring and is fixed with a probe. Installing a removable cartridge with a ceramic filter in the probe groove allows you to clean the selected gas samples due to their dust content, and to increase the accuracy and reliability of determining the composition of the exhaust gases. Volatile and gaseous components are sampled using a special glass intake syringe 5 with a Teflon piston connected to the opposite end from the probe of the sampling tube. Gas analysis is performed using the built-in sample analyzer 6, which is a device with a gas fitting located on it and digital output of the measured information, the analysis of which is carried out. The sample analyzer is fixed to the device through a tee 7. The sampling tube 8 is L-shaped and serves to deliver the selected samples to the analyzer, connected to the probe and syringe through the nozzles 9 and 10. To prevent the exposure of high temperatures to the sampling tube, a coating of refractory material is used inside and out, for example, from silica fabric KT-11. To fix the right angle between the axis of the intake syringe and probe, and to create a rigid structure, a steel frame 11 is used.

A portable dust and gas sampling device is used to collect dust and gases from an open electrolyte area when replacing the anode. The device is partially introduced into the electrolyzer bath to a height of 0.5 m from the melt by the end of the probe 1 with a refractory insert 2, in the groove 3 of which a removable cartridge with a ceramic filter for dust collection 4. is installed. A gas sample is taken by creating a vacuum using a sampling syringe 5. When this, the sampled gas sample containing sublimates of metals and dust is filtered through a ceramic filter 4 mounted in a removable cartridge. Sublimates of metals and dust are deposited on a ceramic filter, and the sample of purified gas enters the sample analyzer 6, fixed to the device through a tee 7, and into the cavity of the syringe 5 through a sampling tube 8 connected at one end to the probe through the nozzle 10, and the other to the syringe through the fitting 9. The sampling tube is fixed in a steel frame 11, which ensures rigidity of the structure and the creation of a directed flow. As the ceramic filter is clogged, the filter is removed and cleaned of sediment, which is also sent for analysis, periodically with a frequency depending on the content of sublimates of metals and dust in the gas sample.

A portable device for sampling dust and gas allows sampling of gas and dust along the entire periphery of the aluminum electrolysis cell, which will make it possible to assess the technological state and identify areas with deviations in the content of electrolyte components, that is, to monitor and diagnose the state of the technical object for subsequent operational measures. If we reconcile the data on emissions from the specific surface with the results of x-ray spectral analysis of electrolyte samples taken at the time of sampling and measurement, we can accurately and quickly determine the cryolite ratio and the ratio of additives at the current time.

Claims (1)

A portable device for sampling dust and gas, including a probe, a sampling tube connected to it and a sample analyzer, characterized in that it further comprises a syringe for sampling dust and gas, connected to a fitting of the sampling tube, which is made in the form of a L-shaped and inside and outside coated with refractory material, such as silica cloth, and placed in a rigid frame, with a groove for installing a removable cartridge with a ceramic filter in the upper part of the probe, and installed in the lower part of the probe and a refractory insert made of ceramic material.

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