Nitrogen generator management system, nitrogen generator process

The 1st floor is really comprehensive, and I have seen it for a long time!

The process flow of the nitrogen generator is that the air is compressed and filtered by the compressor and then enters the polymer membrane filter, resulting in different gases in the membrane with different relative permeation rates.

Under the action of the pressure difference on both sides of the membrane, gases with faster permeation rates such as water, hydrogen, helium, hydrogen sulfide, carbon dioxide, etc. are enriched on the permeation side of the membrane, while gases with slower permeation rates, such as methane, nitrogen, carbon monoxide, argon, etc., are intercepted and enriched on the permeability side of the membrane, so as to achieve the purpose of mixed gas separation.

Features of nitrogen generator:

1) Nitrogen production is convenient and fast

Advanced technology, unique airflow sparger, make the airflow distribution more uniform, efficient use of carbon molecular sieve, about 20 minutes to provide qualified nitrogen.

2) Easy to use:

The equipment has a compact structure, an integral skid-mounted, occupies a small area, does not require infrastructure investment, and the investment is small, and nitrogen can be produced only by connecting the power supply on site.

3) More economical than other nitrogen supply methods:

PSA process is a simple nitrogen production method, using air as raw material, energy consumption is only the electric energy consumed by the air compressor, with the advantages of low operating cost, low energy consumption and high efficiency.

The above content reference:

After the air is compressed by the air compressor, after dust removal, oil removal and drying, it enters the air storage tank, enters the left adsorption tower through the air intake valve and the left suction intake valve, the tower pressure rises, the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve, and the unadsorbed nitrogen passes through the adsorption bed, and enters the nitrogen storage tank through the left suction valve and the nitrogen gas production valve, which is called left suction and lasts for tens of seconds.

After the left suction process, the left adsorption tower and the right adsorption tower are communicated through the upper and lower pressure equalization valves, so that the pressure of the two towers reaches a balance, this process is called pressure equalization, and the duration is 2 3 seconds. After the end of the equalization, the compressed air enters the right adsorption tower through the air intake valve and the right suction inlet valve, the oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve, and the enriched nitrogen enters the nitrogen storage tank through the right suction valve and the nitrogen gas production valve, and this process is called right suction and lasts for tens of seconds.

At the same time, the oxygen adsorbed by the carbon molecular sieve in the left adsorption tower is released back into the atmosphere through the left exhaust valve under pressure, which is called desorption. On the contrary, when the left tower adsorbs, the right tower is also desorption.

In order to completely discharge the oxygen released by the depressurization in the molecular sieve into the atmosphere, the nitrogen is blown out of the adsorption tower through a normally open blowback valve, and the oxygen in the tower is blown out of the adsorption tower. This process is called blowback, and it goes hand in hand with desorption.

After the end of the right suction process, it enters the pressure equalization process, and then switches to the left suction process, and the cycle continues.

The workflow of the nitrogen generator is completed by the programmable controller to control three two-position five-way pilot solenoid valves, and then the solenoid valves control the opening and closing of eight pneumatic pipeline valves respectively. Three two-position five-way pilot solenoid valves control the left suction, pressure equalization and right suction states respectively. The time flow of left suction, pressure equalization and right suction has been stored in the programmable controller, and the pilot gas of the three two-position five-way pilot solenoid valves is connected to the closing port of the pneumatic pipeline valve in the power-off state.

When the process is in the left suction state, the solenoid valve that controls the left suction is energized, and the pilot air is connected to the left suction inlet valve, the left suction gas production valve, and the right exhaust valve, so that the three valves are opened, and the left suction process is completed, and the right adsorption tower is desorbed at the same time. When the process is in the state of pressure equalization, the solenoid valve that controls the pressure equalization is energized, and the other valves are closed; The pilot air is connected to the opening port of the upper pressure equalizing valve and the lower pressure equalizing valve, so that the two valves are opened and the pressure equalization process is completed. When the process is in the right suction state, the solenoid valve that controls the right suction is energized, and the pilot air is connected to the opening port of the right suction inlet valve, the right suction gas production valve and the left exhaust valve, so that the three valves are opened, the right suction process is completed, and the left adsorption tower is desorbed at the same time.

In each process, all but the ones that should be opened should be closed.

RDN series nitrogen generator is based on the principle of pressure swing adsorption, using high-quality carbon molecular sieve as an adsorbent, under a certain pressure, to produce nitrogen from the air.

After purification and drying, the compressed air is subjected to pressurized adsorption and depressurized desorption in the adsorber. Due to the kinetic effect, the diffusion rate of oxygen in the carbon molecular sieve pores is much greater than that of nitrogen, and when the adsorption does not reach equilibrium, nitrogen is enriched in the gas phase to form finished nitrogen. The pressure is then reduced to normal pressure, and the adsorbent desorbs the adsorbed oxygen and other impurities to achieve regeneration.

Generally, two adsorption towers are set up in the system, one tower adsorbs nitrogen production, and the other tower desorption and regeneration, which is automatically controlled by PLC program, so that the two towers work alternately to achieve the purpose of continuous production of high-quality nitrogen.

Trojan Nitrogen Generator PSA Nitrogen Generator.

From an economic point of view, it is still the choice of pressure swing adsorption nitrogen generator and PSA nitrogen generator, the process has been solved above, so I will not repeat it.

Nitrogen displacement controls the flow rate and pressure, which uses the outlet valve of the nitrogen truck to control the injection rate of liquid nitrogen. I think that nitrogen replacement mainly considers the speed of gas pushing, the speed is not complete, and the nitrogen, air, and natural gas mixing head is too long.

1.Normal and normal opening and closing of the power supply, air source and temperature conditions required by the machine; In particular, the stability of the power supply voltage and the nitrogen generator reduce the damage to the controller and solenoid valve caused by power supply problems.

2.Keep an eye on the air reservoir pressure at all times and keep the air reservoir pressure between MPa and not lower than the rated value.

3.Check the automatic drain daily to avoid clogging and losing its draining effect. If it is blocked, you can open the manual valve slightly, close the self-draining valve and then remove the automatic drain to disassemble and clean.

When cleaning the automatic drain, use soap foam to clean it. It is strictly forbidden to use aggressive solutions such as gasoline, toluene, and rosin.

4.The operator should regularly inspect the three pressure gauges on the machine, make a daily record of the pressure change for equipment failure analysis, observe the flowmeter and nitrogen purity at any time, and maintain the nitrogen purity of the outgas.

5.Check whether the heat sink of the refrigeration dryer is clean every week, so as not to affect the utility and life of the dryer due to poor heat dissipation.

6.Operate and maintain according to the requirements of the instrument use code, and check the sensitivity of the solenoid valve and pneumatic valve, the pressure range of the pressure regulator, the accuracy of the gas analyzer, the compression of the adsorption tower, the exhaust condition of the muffler, and the cleanliness of the inner tube of the flowmeter from time to time.

1. According to the provisions on the definition of pressure vessel in the "Regulations on Safety Supervision of Special Equipment", nitrogen generator is a pressure vessel. The provisions of the "Regulations on the Safety Supervision of Special Equipment" and the laws and administrative regulations on production safety should be strictly implemented to ensure the safe use of nitrogen generators.

2. The company's manufacturing support department is a special equipment management department, and the safety officer of the nitrogen generator user unit should actively cooperate with the manufacturing guarantee for the daily maintenance of the nitrogen generator

3. Only operators who have been trained and qualified, hold a special operation personnel certificate issued by the state and have been recognized by the company are allowed to operate the nitrogen generator. The operator should be familiar with the structure and performance characteristics of the nitrogen generator, strictly abide by the operating procedures and operation safety system, and strictly prohibit over-temperature, over-pressure, over-limit and over-range use.

4. The user shall carry out regular daily maintenance and regular self-inspection of the nitrogen generator, and the regular inspection shall be carried out once a month. The operator must carry out daily inspection, and only after passing the inspection can the equipment be operated, and fill in the "Daily Use Status and Periodic Inspection Record of Pressure Vessel".

Just take the commonly used PSA nitrogen generator as an example:

PSA is an advanced gas separation technology, based on the physical adsorption of gas molecules on the internal surface of the adsorbent, and uses the adsorbent to adsorb different gases at a certain pressure to achieve gas separation.

Carbon molecular sieve is an adsorbent to realize the separation of oxygen and nitrogen in Changna, and extract nitrogen from the air, when the adsorption pressure is the same, the adsorption capacity of carbon molecular sieve for oxygen is much higher than that of nitrogen.

PSA nitrogen production, also known as carbon molecular sieve air separation nitrogen production, is the use of this principle, with air as raw material, carbon molecular sieve as the adsorbent, the use of pressure swing adsorption principle, the use of carbon molecular sieve selective adsorption of oxygen and nitrogen, the separation of nitrogen and oxygen in the air, the production of nitrogen.

Nitrogen generator is a nitrogen generating equipment designed and manufactured according to pressure swing adsorption technology.

The maintenance of the equipment in the nitrogen production system mainly includes the maintenance of air compressors, refrigeration dryers, filters, and nitrogen generators. The daily maintenance of the air compressor is mainly as follows:

1.Always check whether the sewage outlet of the air compressor storage tank is blocked and whether the heat dissipation hole is blocked;

2.The radiator of the refrigeration dryer should be cleaned frequently;

3.The drain port of the filter should be checked frequently for blockage; 4.

The exhaust port of the muffler of the nitrogen generator should be checked frequently to see if it is unblocked.

5.The appearance of all equipment of the nitrogen generator should be kept clean and clean, and frequently scrubbed with a damp cloth or neutral soapy water.

2. Periodic maintenance of nitrogen generator equipment:

The maintenance of the oiled screw compressor is mainly the periodic replacement of the inlet air filter (which will be clogged by dust), as well as the annual replacement of the lubricating oil and oil separator. The maintenance of the compressor also includes regular replenishment and replacement of the oil. In order to ensure the stable and reliable operation of the nitrogen production system and the long-life operation of the compressor, the compressor must be maintained in accordance with the periodic maintenance methods and measures recommended by the compressor manufacturer.

The periodic maintenance of the air-cooled refrigeration dryer is mainly to purge and clean the sewage outlet regularly; Please carefully read the operation and maintenance instructions of the refrigeration dryer, and maintain the refrigeration dryer in strict accordance with the periodic maintenance methods and measures recommended by the refrigeration dryer manufacturer.

The periodic maintenance of the filter is mainly to replace the filter element regularly according to the use of the filter. If you find that the pressure difference of the filter is too large, please replace the filter element in time. Please refer to the periodic maintenance methods and measures recommended by the filter manufacturer to maintain the filter.

The nitrogen generator basically does not need periodic maintenance. When all equipment is overhauled, check whether the nitrogen generator is running normally.