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Membrane Nitrogen Generator Operational Security
Oct 23, 2017

Membrane Nitrogen Generator in the use of the problems encountered in two is more common, one is the reliability is difficult to guarantee, the second is the security problems. Its reliability is difficult to ensure that the specific performance in some of the generator is not enough, nitrogen and hydrogen water content is high and there is a certain degree of corrosion, if the improper operation will be returned to the phenomenon of liquid. The above situation will cause the chromatograph is not easy to stabilize and column effect of chromatographic column reduction, serious can be gas road and chromatographic column scrap, or even lead to the total scrap of the chromatograph. The second is the use of the process of security problems,Membrane Nitrogen Generator  some Membrane Nitrogen Generators in the use of the compressor in the process will produce overheating, gas road into the oil, leakage, and other phenomena, not only to the chromatograph caused damage, serious will endanger the life of the operator safety.

Because the chromatograph uses high-purity nitrogen or high-purity hydrogen to carry gas, in order to deal with the above problems, we have summed up some experiences from three aspects of hydrogen generator, nitrogen generator and compressor safety reliability.

First of all, the hydrogen generator is mainly composed of electrolysis system, pressure control system, purifying system and display system. Electrolysis using the current membrane separation technology,Membrane Nitrogen Generator  from the infrared photoelectric feedback device and switching power supply of the pressure control system, so that the occurrence of hydrogen in accordance with the needs of the output automatically adjusted to maintain the output flow and pressure stability. Some of the main problems with hydrogen generated by this principle are:

1. The hydrogen produced by the hydrogenation generator with Koh aqueous solution is high in moisture content and has some corrosive property, which causes the instability of the chromatographic instrument to be debugged, and it is necessary to reduce the column effect of chromatographic column once the hydrogen gas is used for a long time.

2. If the hydrogen gas produced by this principle is used for a long time, it will cause serious reflux phenomenon. In order to prevent the return of liquid,Membrane Nitrogen Generator  manufacturers designed a variety of devices to try to solve the problem, but can not solve the fundamental problems. After all, it still wants to add liquid, once the backflow of the device failure will cause the gas road and chromatographic column scrap, serious may even lead to gas chromatograph all scrap.

3. Most of the gas purity has not been tested, although the baseline and pillar life can be judged by its purity, the result is to the chromatographic column caused unnecessary loss.

Therefore, hydrogen as an auxiliary gas is also OK, do not carry gas purity. In the selection of hydrogen generator priority to ensure the quality of the manufacturers, but also can be installed on-line purity testing device to ensure the purity of the gas.

Secondly, whether the nitrogen generator can be used well in gas chromatographic analysis is very important to the principle of the generator. The working principle of nitrogen generator is roughly divided into three kinds:

1. The combination of electrochemical separation and physical adsorption method

2. The use of hollow fiber membrane separation

3. Separation of new synthetic molecular sieves by gas chromatography

There are many problems with the nitrogen produced by this principle. The main problems are:

1. The nitrogen in the nitrogen generator with KOH aqueous solution has high water content and a certain corrosive effect.

2. There is a phenomenon of reflux.

3. Low purity of nitrogen, the thermal conductivity of the detector of the chromatograph will cause oxidation, a long time the sensitivity of the detector to reduce.

In view of the above three points, many chromatograph manufacturers, instrument distributors and maintenance personnel do not recommend the use of this principle to produce nitrogen generator gas chromatograph.

This is a new type of air separation method, which is compressed air as raw material, synthetic molecular sieve as adsorbent, gas chromatography separation adsorption process, at ambient temperature and low pressure, the use of oxygen and nitrogen in the air diffusion in molecular sieve,Membrane Nitrogen Generator  the separation of oxygen and nitrogen, the purity of nitrogen and gas production can be adjusted according to customer needs. The gas flow rate is stable, the nitrogen purification is thorough, the nitrogen purity of the output is high, the highest can obtain 99.9995% pure nitrogen, suitable for various gas chromatograph detectors. The generator can produce high quality and high-purity nitrogen, running stably and reliably without any chemical consumables. Easy to operate, can be unattended for 24 hours. And it can operate without any supervision and minimum maintenance.

To sum up, the nitrogen generator using the separation method of synthetic molecular sieve by gas chromatography is better than that by using the electrochemical separation method and the physical adsorption method and the hollow fiber membrane method. It can be used in various types of gas chromatograph at home and abroad as a carrier gas, is a good performance maintenance of a new generation of nitrogen generator.