Please, the specific method of industrial nitrogen production

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.

Preparation method of nitrogen:

1. Cryogenic air separation nitrogen production: It is a traditional air separation technology with a history of more than 100 years. It is characterized by large gas production and high nitrogen purity of the product, and can produce more high-purity nitrogen without repurification.

However, its process flow is complex, covers a large area, the infrastructure cost is high, it requires special maintenance forces, there are many operators, it takes 18-24h to start each time, and the gas production is slow.

At standard atmospheric pressure, when cooled to a point where it becomes a colorless liquid, when it is cooled to a point where liquid nitrogen becomes a snow-like solid. It is suitable for large-scale industrial nitrogen production, and the cost of nitrogen is high.

2. Membrane separation nitrogen production: Membrane separation air separation nitrogen production is also a non-low-temperature nitrogen production technology, which is a new nitrogen production method rapidly developed abroad in the 80s, and it has been popularized and applied in China in recent years.

Membrane separation nitrogen production is to use air as raw material, under a certain pressure, using the different permeation rates of oxygen and nitrogen in the hollow fiber membrane to separate oxygen and nitrogen to produce nitrogen.

Compared with the above-mentioned nitrogen production methods, it has the characteristics of simple equipment structure, small size, no switching valve, easier operation and maintenance, faster gas production (less than 3min), and more convenient capacity increase, but the hollow fiber membrane has stricter requirements for compressed air cleanliness, and the membrane is easy to age and fail, difficult to repair, and needs to be replaced with a new membrane.

Membrane separation nitrogen production is more suitable for small and medium-sized users with nitrogen purity requirements of about 98%. When the purity of nitrogen is required to be higher than 98%, it is about 30% higher than that of the same type of pressure swing adsorption nitrogen generator.

3. Pressure swing adsorption nitrogen production (pressure swing adsorption, English translation as pressure swing adsorption, referred to as PSA): gas separation technology is an important branch of non-low temperature gas separation technology, which is the result of people's long-term efforts to find a simpler air separation method than cryogenic method.

Nitrogen production is based on air as raw material, using carbon molecular sieve as adsorbent, using carbon molecular sieve to select the adsorption of oxygen and nitrogen in the air of the land code cavity characteristics, at room temperature, pressure adsorption, decompression desorption, so that oxygen and nitrogen are separated, so as to produce nitrogen. Pressure swing adsorption nitrogen generator equipment is required.

Heating a mixture of ammonium chloride saturated solution and sodium nitrite solid or saturated solution to about 85 produces nitrogen:

nano2+nh4cl==nh4no2+naclnh4no2 n2↑+2h2o

Hope it helps.

Since the reaction is exothermic, it is heated at the beginning and the heating can be stopped when the reaction occurs. This solid-to-liquid (or liquid-to-liquid) reaction that needs to be heated can be carried out in a round-bottom flask (or distillation flask) with a device connected by a double-orifice stopper, a separating funnel, or a catheter (or separating funnel, single-orifice stopper) and collected by the drain gas collection method.

to produce nitrogen. The device used is a large test tube with a single-hole plug and a catheter, which is fixed to an iron frame. Before the drug is loaded into the large test tube and heated, some glass fibers should be placed in the mouth of the large test tube to prevent the reactants from rushing out.

Iron powder can be slightly coarser. The heating should be moderated to prevent the reaction from being too violent and side reactions, such as the thermal decomposition of potassium nitrate.

Laboratory Method:

Heat a mixed solution of sodium nitrite and ammonium chloride: NH4Clnano2

nh4no2

naclnh4no2

N22H2O (heated).

In industry, the method of fractionating liquefied air is generally used.

In industry, the method of fractionating liquefied air is generally used.

n +o = (energized) = 2no; 2no+o₂=2no₂；h₂o+3no₂=2hno₃+no。

Nitrogen is the most abundant element in the air, which is widely present in nature and has a great role in living organisms, and is a component of amino acids.

One of the basic elements.

The percentage by weight content of nitrogen in the earth's crust is that the proteins carried by animals and plants contain nitrogen. There are nitrates in the soil.

For example, kno. in South America.

Chile has saltpeter (nano), the only deposit of its kind in the world, which is a rare nitrogenous deposit. Nitrogen-containing molecules, such as NH, HCN, etc., have been found in the cosmic star internucleus.

Laboratory Method:

Sodium nitrite ridge is mixed with ammonium chloride and heated.

nh4no2=△=n2↑+2h2o

Potassium dichromate is mixed with ammonium sulfate and ground and heated.

NH4)2Cr2O7= =N2 +Cr2O3+4H2O heated azide (the nitrogen produced is extremely pure, cherry kernel orange is rarely used but it is too dangerous) 2Nan3= =2Na+3N2