What is the Working Principle of a Nitrogen Generator?

A nitrogen generator is a machine, which produces the nitrogen gas from the air we live in. The generator is used to separate the air which contains a mixture of nitrogen and oxygen to obtain clean nitrogen. It does this by employing filters and special materials which capture oxygen and allow for the passage of nitrogen. This is often a preferred option for many factories as this eliminates the need for them to purchase and store nitrogen cylinders. Rather, they are able to generate gas onsite as required. Nitrogen generator are used in various industrial processes, including food packaging, electronics manufacturing, and even for making beverages, which requires a stable and clean source of nitrogen.

Basic Structure of a Nitrogen Generator

The nitrogen generator is basically made of several key components, running in a fairly simple series-flow. Next is the central part where there's separation. Special materials used in the generator are known as molecular sieves. These are used as a selective gate. The sieve keeps oxygen molecules, but not the nitrogen. The machine will typically operate in cycles – one chamber will be separating gases, and another chamber will be being cleaned and reset. Nitrogen is in constant flow without any long stops.The separated nitrogen is stored in a storage tank or it is sent directly to the point of use. In certain systems, there is a buffer tank which is used to provide a constant gas supply, even when the gas demand is not. There is also a control panel to control pressure, timings and flow, so that it does not require constant manual control and is always in order.Such a setup can be adopted in a snack food packing plant. The machine supplies nitrogen to the bags and eliminates oxygen, which helps to achieve a longer freshness for food. It can be utilized in a metal shop for nitrogen gas to be used in laser cutting where a clean and dry gas stream is required for smooth edges to be produced.When looking at the structure as a whole, it's all about the right air flow, the right cleaning and the right separation. All of them have a specific function and are connected to each other to ensure that the production of nitrogen gas can be relied upon for all day-to-day uses.

How Nitrogen is Produced by the Generator?

Regular air is used to make nitrogen in a generator. The air is made up of about 78% N2 and 21% O2 and a small percentage of other gases. This air is fed into the machine which purifies the nitrogen.Firstly, air is sucked from the air through the compressor and is forced under pressure into the system. This pressure is crucial as it assists in proper operation of the separation process. The air goes through filters before undergoing the main separation stage. These filters are for the removal of water vapor, oil and very small particles. This is because dirt and moisture can potentially affect the operation of the system.After the air is cleaned, it is taken to the separation stage. This is accomplished in many PSA nitrogen generator by a material known as a molecular sieve. This material has very small holes which act as a selective trap. The oxygen molecules are too big to fit through the sieve and the nitrogen molecules are small enough to fit through the sieve and go on flowing. The main separation area.In a system usually two chambers are used to work in a cycle. One of the chambers is used for the generation of nitrogen and the other for purging to release the nitrogen for re-use. This switching guarantees that flow of nitrogen is kept steady and constant, avoiding long breaks.The separated N is stored and delivered to a storage tank or to where it is needed. Some foods like snack bags in food packaging lines may be pushed out by nitrogen.This will help to make the chips or biscuits last longer fresh. The same gas is used for anti-oxidation in electronics manufacturing, where sensitive assembly processes are carried out.

Functions of the Air Compressor and Adsorption Tower

The air compressor is one of the most important parts of the nitrogen generator and compresses the air to be processed in the adsorption tower. An air compressor is one of the most important parts of a Small nitrogen generator , which is used to compress air to be sent to the adsorption tower for adsorption.It is designed to suck in regular air from the environment and under compression, store it in a more compact area. The importance of this step is that the gases act differently when compressed. It would not separate well later on, if it were not stressed during initial production. The compressor is also used for regulating a constant air flow in the system. For many configurations, it can be considered as the engine which keeps everything going. For example in a food packaging plant, if the compressor trips out the whole nitrogen supply is switched off, and this could result in a quick production halt.The air is compressed and then transferred to the adsorption tower. The real separation takes place in this part. A special material is situated inside the tower which can bind oxygen molecules. This material can generally be a molecular sieve. On entering the compressed air, the oxygen is trapped within the small pores of the material, but the nitrogen is not trapped and passes through the material.Typically, it can be seen that most N2 generators have two adsorption towers which are operated in alternation. One tower is in use for gas separation and the other tower is being cleaned by purging the trapped oxygen. This back and forth cycle will enable the system to continue working and producing N without extended periods of stand down. Think of 2 people working in alternating shifts so there's never a time when it can't get done.

Purity Can Be Customized According to Application Requirements

Another feature of a nitrogen generator is that the purity of the nitrogen gas can be altered based upon the requirement. The flexibility of not demanding the same degree of purity for all jobs makes this more practical for actual use.Nitrogen purity is basically the amount of nitrogen present in the gas in relation to other residual gases, such as oxygen. It is possible to adjust the flow, pressure, and the manner in which the adsorption process is run to allow a generator to produce higher or lower purity nitrogen. If the requirement is for higher purity, the flow through the system is slightly reduced, giving the molecular sieve more time to remove oxygen. If the purity of the gas is not critical, the system can deliver gas at a higher production rate.