Gas analyzer

 

(57) Abstract:

The invention relates to devices for analytical instrumentation and can be used as a chromatographic device in the refining, petrochemical and other fields to measure the microtraces. A gas analyzer, comprising a gas system consisting of air treatment module, switch gas flows and item sampling, block columns, the detection unit, thermostat, the control unit and signal processing unit speakers made in the form of absorption and the number of parallel separation columns, the detection unit contains a number of gas detectors, the number of which corresponds to the number of separation columns, and the air treatment module, item sampling, the units column and detection was placed in a thermostat. Additionally, the gas analyzer has as switches the gas flow solenoid valves equal in number to 5, the number of separation columns in a block of columns equal to three, and the control unit and the signal processing executed in the form of a microprocessor. The invention improves performance and simplifies the gas analyzer when zooming in and can be used as a chromatographic device in the refining, petrochemical and other fields to measure the microtraces.

Known chromatograph (ed. St-in the USSR N 1245999 IPC G 01 N 30/90) used to analyze the composition of gas mixtures consisting of a thermostat placed in it by the detector and the separation column and placed outside thermostat offset the impact of environmental parameters, which maintains a constant density of the analyzed product or a change in the ambient temperature. This gas chromatograph has the coil in thermal contact with the control Cam follower.

The disadvantage of this chromatograph is its complexity, since only the corrector includes more than a dozen parts. The proof requires two sources of compressed air.

Also known chromatograph (ed. St-in the USSR N 1430882 IPC G 01 N 30/88), consisting of a detector measuring systems, devices increase the sensitivity in the form of a channel check, channel correction, the offset drift of the reference oscillator, which in turn contain significant amounts of radio engineering devices and elements. This chromatograph also contains two amplifiers, two filter low Costopoulos bandwidth and reference generator. In this chromatograph includes several switches: ranges and polarities bandwidth.

The disadvantages of this chromatograph is its difficulty and complexity.

Known chromatograph HCG-1G [Technical description and operating instructions. Moscow 1988], which consists of a programmer analysis, gas block, block, detector, block temperature programming, registrars, hydrogen generator, the power block.

The disadvantages of this device is a pneumatic actuator mounted switches 3 gas streams, which require great air flow. The presence of a hydrogen generator requires little maintenance. And environmentally device is flawed because the product hydrogen generator require special disposal. In addition, the analysis time of 130 seconds may not satisfy the quality of research in the process of drilling wells, because the lack of information due to the slowness of the process does not allow an accurate and objective conclusion about the efficiency of the studied section.

The closest analogue to the claimed solution is a gas analyzer company GEOCERVICES [manual g the population and the signal processing unit.

However, the chromatograph has insufficient performance - measurement cycle is 300 seconds, which leads, as in the previous case to unsatisfactory results.

The task of the claimed device - eliminating the lack of performance while simplifying and improving the reliability of the proposed device.

The essence of the proposed solution lies in the fact that in the gas analyzer, including the gas system in the form of air treatment module, switches, gas flows, and item sampling - dose, unit columns, the detection unit, thermostat, the control unit and signal processing unit speakers made in the form of absorption and series connected in parallel separation columns, the detection unit contains a number of gas detectors, the number of which corresponds to the number of separation columns, and the air treatment module, item sampling - dose, blocks, columns and detection placed in thermostat.

In addition, the claimed variants, modifications, and improvements of this gas analyzer: performance of switches in the form of electromagnetic valves, the number of which is five; the number of columns in the separation unit three.

In addition Tahoe control unit and signal processing.

The gas analyzer shown in the drawing, in which the positions 1-14 blocks and items:

1 - air inlet;

2 - preparation unit air;

3 - solenoid valve;

4 - element sampling - dose;

5 - separation column;

6 - adsorption column;

7 - input gas line;

8 - pump;

9 - input device manually;

10 - the discharge into the atmosphere;

11 - thermostat;

12 - gas detector;

13 - the control unit and signal processing;

14 - power;

Arrows indicate the connection to the control unit and signal processing other blocks and items.

The operation of the gas analyzer is as follows.

In the initial state of the electromagnetic valve 3 is de-energized. In this case, the gas mixture from the gas inlet line 7 is pumped by pump 8 through the element sampling - dose 4 and is discharged into the atmosphere 10, or injected by syringe into the input device manually 9 and is contained in item sampling - dose 4. The carrier gas from the air treatment module 2 is fed to the absorption column 6 and exits through the discharge into the atmosphere 10 and enters the separation column 5, next to gas detectors 12 and also through the discharge into the atmosphere 10. the giving and they switch. In this position the gas mixture located in the element sampling - dose 4, is served by the carrier gas through the adsorption column 6 on the separation column 5, next to the gas detectors 12 and to discharge into the atmosphere 10.

After a time corresponding to the passage through the adsorption column 6 of the analyzed components of the gas mixture (10 to 30 seconds depending on the selected cycle), the signal control unit and signal processing 13 with electromagnetic valves 3 tension and made them switch to the original position. In this position, corresponding to the mode analysis, remaining in the adsorption column components are blown out of her carrier gas for further separation in the separation column 5 and further through the gas detectors 12 in the atmosphere.

Separated in the separation columns 5 components entering the detectors 12 and passing through the cavity sensors gas detectors, interact with their heated surface, changing the electrical properties of the sensing elements is greater, the greater the concentration of components. The electrical signals of the sensing elements in the form of peaks, the area of which is proportional to sodergatsja into digital values, which are recorded, processed and displayed in the PC in the form of digital code.

In addition, the control unit and signal processing controls thermostat 11.

Control settings are entered into the control unit and signal processing using the PC and stored in non-volatile memory. The power supply unit 14 generates a voltage necessary for operation of the gas analyzer.

Example

The inventive solution is carried out in accordance with the above. Used in the mock-up sample design, in which one absorbing and three separation column. The system of redistribution of gas flows collected on single-channel switching electromagnetic valves. The number of the last five. The detector is applied to the sensor adsorption-semiconductor type. The pressure in the columns of 0.8 ATM. The operation of the gas analyzer and signal processing of the detector is performed by the control unit and signal processing.

The advantages of the proposed gas analyzer shows the comparison table, which shows the technical performance chromatographs, widely spread.

Conclusion: for us to analyze the gas mixture components from H2to C6+d

1. Gas analyzer, including the gas system in the form of air treatment module, switch gas flows and item sampling (dose), the block column, a detection unit, a thermostat, a control unit and signal processing, characterized in that it block columns made in the form of absorption and series connected in parallel separation columns, the detection unit contains a number of gas detectors, the number of which corresponds to the number of separation columns, and the air treatment module, item sampling (dose), blocks of columns and detection placed in thermostat.

2. Gas analyzer under item 1, characterized in that it switches the gas flow is made in the form of a single-channel switching of the solenoid valves.

3. Gas analyzer under item 2, characterized in that the number of solenoids is five.

4. Gas analyzer under item 1, characterized in that it has three separation column.

5. Gas analyzer under item 1 or 4, characterized in that the control unit and the signal processing executed in the form of a microprocessor.

 

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