Gas analyzer

FIELD: investigating or analyzing materials.

SUBSTANCE: gas analyzer comprises chromatographic columns, detectors, unit for preparing air mounted inside the thermostat, unit for control and processing signals, member for sampling, switches of gas flows, pump for pumping gas mixture, and separating passages connected in parallel and provided with the check valve interposed between them. Each of the separating passages is made of absorbing and separating chromatographic columns connected in series, and the pump is connected to the input of the gas line through the electric valve. The gas analyzer can be made of two separating passages and low pressure chromatographic columns.

EFFECT: enhanced quality of analyzing.

2 cl, 1 dwg, 1 ex

 

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.

Known chromatograph (ed. St-SU No. 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-SU No. 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 contains two gain the body, two filter low frequency driver control commands offset base signal, the filter of low frequencies with the bandwidth switch and reference generator. In this chromatograph includes several switches ranges and polarities bandwidth.

The disadvantages of this chromatograph is its difficulty and complexity.

Also 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. 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.

Also known gas analyzer company GEOCERVICES [manual gas is th analyzer CHROMATOLOGGER company GEOCERVICES 1980], which has a gas system, a detector, a thermostat, a control unit and a signal processing unit.

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

The closest analogue of the proposed solutions is the detector (patent RU №2141656, 19.11.98)used to analyze the composition of gas mixtures, including the gas system consisting of an air treatment module, switch gas flows and item sampling, chromatographic column, a detection unit, a thermostat, a control unit and signal processing. The chromatographic column in its composition have the same absorption and the number of parallel separation columns; a 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. As switches gas flow applied to the solenoids, the number of which is equal 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 gas analyzer has a pump for pumping the gas mixture.

Yes the hydrated analyzer improves performance, simplifies the design while increasing reliability. However, he divides the gas components in the research process does not adequately and to increase the degree of separation required frequent calibration of the instrument.

The task of the claimed device - eliminating the lack of separation of components.

The essence of the proposed solution lies in the fact that in the gas analyzer, comprising a chromatographic column, a detector, an air treatment module, placed in a thermostat, a control unit and a signal processing element sampling switch gas flows in the form of a single-channel switching of the solenoid valves and the pump for pumping the gas mixture, there are channels separation, in parallel, between which introduced a check valve providing air flow in a channel separation, each of the channels of the separation is made in the form of series-connected adsorption and chromatographic separation column and detector, and the pump is installed on the inlet gas line through the solenoid.

In addition, the inventive gas analyzer has a schema modification. Aplauda options scheme with two channels of chromatographic separation and low pressure columns.

The inventive device is illustrated in the block diagram, shown in the drawing, where the positions 1-15 designation is s and elements: 1 - the air inlet; 2 - air treatment module; 3 - single channel switching 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 supply; 15 - return valve. Arrows indicate the connection to the control unit and signal processing other blocks and items.

The claimed technical solution unlike most similar analogue chromatographic column formed in the channels of the separation, installed parallel to each other. Each of them sequentially placed in an adsorption separation column 6 and 5. Between channels division entered the check valve 15, which excludes the influence of the gas flow in them. The pump 8, Sipper gas mixture, is installed on the inlet gas line 7, followed by single-channel switching solenoid 3.

The operation of the gas analyzer is as follows.

In the initial state single-channel switching solenoids 3 is deenergized.

In this case, the gas mixture is pumped by the pump 8 from the input gas line 7 and is discharged into the atmosphere. The carrier gas from the air treatment module 2 is fed in parallel to the channels times the population between absorptive 6 and the separating columns 5, further, through the separation column and the gas detectors 12 to the atmosphere through the absorption column is also on the discharge into the atmosphere, and in one of the channels separating the carrier gas is supplied through the check valve. Item sampling - dose 4 is disconnected from gas streams.

The signal control unit and signal processing 13 switching on single solenoid 3 behind the pump 8, is energized and it switches. In this case, the gas mixture from the gas inlet line 7 is fed by the pump 8 in item sampling - dose 4 and then released into the atmosphere through the outlet 10.

Then, after a certain time (3-5 seconds), also on the input unit 13 of the control and signal processing with a single-channel switching solenoid 3 behind the pump, tension is released and it returns to initial state, and all other single-channel switching solenoids 3 is energized and switched them. In this position the gas mixture is again pumped by the pump 8 through the gas inlet line 7 and is discharged into the atmosphere. The carrier gas from the air treatment module 2 is supplied to the element sampling - dose 4, displaces contained in the gas mixture and delivers it to the inputs of parallel channels split - consistently included in an adsorption separation column 6 and 5, then the gas is passed the detectors 12 and into the atmosphere through the discharge 10. In this case, the check valve eliminates the influence of the gas flow in the channels of the separation.

After a time corresponding to the passage through the adsorption column 6 components of the gas mixture, analyzed in the channels of the separation (from 7 to 14 seconds, depending on the investigated range of gases), the signal control unit and signal processing 13 with single-channel switching of the solenoid valves 3 and tension and made them switch to the original position. In this position, remaining in the adsorption columns 6 components are blown out of them by the carrier gas into the atmosphere and passed through them, the components enter for further separation in the separation column 5 and further through the gas detectors 12 and out into the atmosphere 10.

Separated in the separation columns 5 components entering the detectors 12 and passing through the cavity sensors gas detectors, change their electrical properties, and these changes 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 the content of the component (chromatogram), are fed into the control unit and signal processing, where it is converted 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, maintaining it constant temperature.

Controls the settings are entered in 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 two parallel channel separation, made in the form of series-connected adsorption and separation columns. 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. Pressure on columns 0.2 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 is that by applying in each channel split its absorption column excludes the possibility of falling into the separation column even small amounts of gas components, the following during the study in this channel. The presence of kaylerachelle small number of untested component of the gas leads to a distortion of the "zero line" of the channel, and, as a consequence, affects the degree of separation of the investigated components. In the present detector separation criterion K1 was determined by A.A. Gukovitski, Nmerchant. Gas chromatography, M, Costoptimized, 1962) has a value of at least 0.92, whereas in the prototype, its value was in the range of from 0.7 to 0.85. Improving the degree of separation of components made it possible to reduce the number of separation columns from three to two with the same number of the investigated components. Reducing the number of columns and, consequently, gas detectors, as any reduction in the basic devices and systems in the device, in addition to its simplicity enhances reliability.

In addition, the measuring circuit of the detector in the form of a number of channels division, consisting of series-connected adsorption and separation columns, allowed to apply low pressure column, which greatly reduced the flow of carrier gas. Installing the solenoid valve after the pump has ensured the continuity of pumping gas mixture through the gas inlet line, which provided another advantage of the inventive device, which ensures an even feed of the gas mixture analysis, and this is very important when large distance of the object of research from the detector and, consequently, greater lengths of the gas lines.

1. A gas analyzer, comprising a chromatographic column, a detector, an air treatment module, placed in a thermostat, a control unit and a signal processing element sampling switch gas flows in the form of a single-channel switching of the solenoid valves and the pump for pumping the gas mixture, characterized in that it has a channel separation, in parallel, between which introduced a check valve providing air flow in a channel separation, each of the channels of the separation is made in the form of series-connected adsorption and chromatographic separation column and detector, and the pump is installed on the inlet gas line through the solenoid.

2. The gas analyzer according to claim 1, characterized in that the amount of channel separation of at least two.

3. The gas analyzer according to claim 1, characterized in that the chromatographic column is a column of low pressure.



 

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Gas analyzer // 2267123

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