LDH series liquid nitrogen equipment is based on the pressure swing adsorption principle, using high-quality carbon molecular sieve as adsorbent, under a certain pressure, from the air to produce nitrogen. After purifying and drying compressed air, pressure adsorption and decompression desorption are carried out in the absorber. Due to the kinetic effect, the diffusion rate of oxygen in the micropores of carbon molecular sieve is much higher than that of nitrogen. When the adsorption is not in equilibrium, nitrogen is enriched in the gas phase to form the finished nitrogen. Then decompression to atmospheric pressure, adsorbent adsorption of oxygen and other impurities, to achieve regeneration. Generally, two adsorption towers are set up in the system. One tower absorbs nitrogen and the other tower is desorption and regeneration. Automatic control by PLC program makes the two towers work alternately. The finished nitrogen is then passed through the refrigerator to produce liquid nitrogen.

Technical features:
1. Adopt diversified environmental protection refrigerating medium with independent intellectual property rights2. The cold box adopts special secondary foaming technology to achieve good thermal insulation effect3. The refrigeration system adopts internationally famous compressor, which is safe and durable, and the spare parts are conventional4. Compared with the traditional Stirling liquid nitrogen unit, it has the following advantages: low cost, no regular maintenance, high reliability and long service cycle.

LDH liquid nitrogen machine technical characteristics

1. Adopt diversified environmental protection refrigerating medium with independent intellectual property rights

2. The cold box adopts special secondary foaming technology to achieve good thermal insulation effect

3. The refrigeration system adopts internationally famous compressor, which is safe and durable, and the spare parts are conventional

4. Compared with the traditional Stirling liquid nitrogen unit, it has the following advantages: low cost, no regular maintenance, high reliability and long service cycle

The liquefaction efficiency is high

Invest in commercial compressors, heat exchangers and other equipment that are mature on the market

Lends itself to easy installation, high reliability, no maintenance, and long operating cycle

Simple operation

After-sales service

Introduction to after-sales engineers;

Schedule of emergency maintenance;

Prices and supply channels of main spare parts

Special services

Training plan;

Train operators to operate the equipment skillfully;
Let maintenance personnel master the daily maintenance and repair work of equipment; When the service personnel visit the user: understand the user's use situation, conduct secondary training for the operator, so that the operation and maintenance personnel further understand the equipment.

 

Nitrogen protection machine for coffee nitrogen generator

At low temperature and high pressure, nitrogen will dissolve into the coffee, once back to atmospheric pressure, will release a large number of tiny bubbles, foam like cold fog floating in the coffee, eventually forming a dense foam like Espresso.

(Dynamic diagram of foam formation)

Nitrogen adds fullness and texture to coffee compared to unaerated coffee.

Nitrogen coffee is made in two step

"Coffee Preparation" and "Nitrogen Incorporation"

The process of making coffee is very mature, and adding nitrogen is not complicated. It just requires some special equipment.

So, let's talk about how to make a cup of nitrogen coffee --

Everyone likes different flavors.

I'm a homebrewer and once collaborated with my coffee roaster friend Renaud on a coffee beer.

The first time I used a light, sour baked peyega chaffee, which I didn't call beer at all, but Reynaud liked it very much.

The second time, he used a medium depth of Mantinim and reduced the ratio to a malt and hop flavor, but Reynaud felt that the fruit acid was completely missing.

So, as far as a drink is concerned, which flavor is better, it depends on you.
Low flavor

The effect of nitrogen is more on the taste rather than changing the flavor too much. But if a mixture of gases is used for gasification, it needs to be adjusted according to the specific gas characteristics.

Production method

The mainstream nitrogen coffee production method is mainly cold extraction. After a long time of low temperature extraction, the coffee powder dissolves the oils and aromatic substances containing flavor, avoiding the undesirable flavor produced by high temperature combination reaction. Ice drops and ice brew are good choices.

In addition, some baristas use Espresso to make nitrogen coffee. The Espresso is thicker, and nitrogen will make it produce the effect of milkshake. The experience is completely different, and the production is more time-consuming.

Low gas

Nitrogen coffee generally uses "pure nitrogen" or "nitrogen - carbon dioxide mixture".

Both of these food-grade gases are available at the Universal TB.

But manufacturers generally do not sell the mixture directly, so they have to buy an extra tank of carbon dioxide and mix the proportions themselves.

Low pure nitrogen

Nitrogen is usually insoluble in water, unless you use a low-temperature, high-pressure container to deal with it, and once it's free, it immediately becomes insoluble again.

But don't worry, pure nitrogen doesn't erupt like Coke. Even when shaken violently, it will only slowly form a cloud of bubbles that slowly rise to form a thick white foam.

Pure nitrogen (99.999%) is colourless, tasteless and does not change the flavor of coffee except for the taste. It is safe and non-toxic.

PSA Nitrogen Generator  full name: Pressure Swing Adsorption (PSA).PSA is a new gas separation technology, which has been developed rapidly in foreign countries since the late 1960s and early 1970s. Its principle is to separate the gas mixture by the difference of the "adsorption" performance of different gas molecules by molecular sieve. It takes air as raw material.The nitrogen and oxygen in the air are separated by the selective adsorption of nitrogen and oxygen with a high efficiency and high selection of solid adsorbent.

At present, carbon molecular sieves and zeolite molecular sieves are used more in the field of nitrogen and oxygen production.The separation of oxygen and nitrogen by molecular sieve is mainly based on the different diffusion rates of the two gases on the surface of molecular sieve. Carbon molecular sieve is a carbon-based adsorbent with some characteristics of activated carbon and molecular sieve.Carbon molecular sieves are composed of very small micropores with pore sizes ranging from 0.3nm to 1nm.The smaller diameter of the gas (oxygen) diffuses faster and more into the solid phase of the molecular sieve, so that nitrogen enrichment can be obtained in the gas phase.After a period of time, molecular sieve on oxygen adsorption balance, according to the carbon molecular sieve under different pressure on the adsorption of different gas adsorption characteristics, reduce the pressure to remove the carbon molecular sieve on oxygen adsorption, this process is called regeneration.PSA usually uses two towers in parallel, alternately pressurized adsorption and decompression regeneration to obtain a continuous flow of nitrogen.

With air as raw material, with carbon molecular sieve as adsorbent, the use of pressure change adsorption principle, the use of carbon molecular sieve on oxygen and nitrogen selective adsorption and separation of nitrogen and oxygen method, commonly known as PSA nitrogen.This method is a new technology of nitrogen production which developed rapidly in 1970s.Compared with the traditional method of nitrogen, it has simple process, high degree of automation, produce gas quickly (15 ~ 30 minutes), low energy consumption, product purity can be adjusted according to user needs in a wide range, convenient operation and maintenance, low operating cost, good adaptability device etc., in 1000 nm3 / h the following competitive in nitrogen making equipment,PSA is more and more popular among medium and small nitrogen users, and has become the choice method for medium and small nitrogen users.

1. Why choose PSA nitrogen generator ?
High  purity
PSA nitrogen generator plants allow production of high-purity nitrogen from air, which membrane systems are unable to provide - up to 99.9995% nitrogen.The nitrogen generators use CMS (carbon molecular sieve) technology to produce a continuous supply of ultra high purity nitrogen and are available with internal compressors or without.
Low operating costs
By substitution of out-of-date air separation plants nitrogen production savings largely exceed 50%. 
The net cost of nitrogen produced by nitrogen generators is significantly less than the cost of bottled or liquefied nitrogen.
Nitrogen Generators Create Less Impact on the Environment
Generating nitrogen gas is a sustainable, environmentally friendly and energy efficient approach to providing pure, clean, dry nitrogen gas. Compared to the energy needed for a cryogenic air separation plant and the energy needed to transport the liquid nitrogen from the plant to the facility, generated nitrogen consumes less energy and creates far fewer greenhouse gases.
Nitrogen protection machine for coffee nitrogen generator

LDHGAS psa nitrogen making machine process and equipment introduction
1. The technological process of nitrogen generator is briefly introduced
Air through the air filter to remove dust and mechanical impurities into the air compressor, compressed to the required pressure, after strict oil removal, water removal, dust removal and purification treatment, output clean compressed air, the purpose is to ensure the service life of the molecular sieve. At work, one pot adsorption, the other pot desorption, two sub work alternately. Clean air into the working adsorption tower, through molecular sieve oxygen, carbon dioxide and water absorption, flow to the outlet end of the gas is nitrogen and trace argon and oxygen. In this way, the two towers take turns to separate nitrogen and oxygen and continuously output nitrogen. The purity of nitrogen produced by psa is 95% to 99.999%.

Which nitrogen generator should I choose?
Different parameters are essential for your choice of nitrogen generator 
 

•  How big is your consumption?
•  Is your consumption variable?
•  Which pressure is required?
• What purity/capacity is required?
•  Do you already have a compressed air system?
  
  Why choose LDH GAS?
• Be your own supplier, customized.
• Mobile and flexible sloutions
• Produce gas when and where you want
• Save your installation cost
• minimum maintence .fully automatic operation
• Only quality compenents are used.

3) Spare Parts Service
Worldwide, quick and low-priced over the complete lifetime of your plant. The distinct tagging of all plant components delivered by us enables us to identify clearly the spare parts requested by you. We supply you with products designed for a long life and economic efficiency. 
For modifications and extensions we look for the most optimal and economic solution for your individual purpose. 
4) Maintenance/Revisions
Regular inspection and maintenance ensures permanent operation, avoids damage and prevents unexpected breakdowns. In the course of maintenance/revision works we check all relevant components for function and condition, exchange defect, used and worn parts and afterwards optimally eadjust your plant to the given operating conditions. Depending on the plant size and 
scope of work, our service range comprises also a detailed scheduling of revisions as well as coordination and supervision of contractors. As a matter of course we supply maintenance documentation in form of reports and spare part recommendations, and we coordinate our schedules according to your requirements. 
5) Training
Operation, maintenance and repair, electric measuring and control equipment or process engineering - we offer  you specific training by our experts. Whether on site working with theplant itself, or on our permises, we concentrate on your questions and problems. 

Our industry users:

1. Food packaging, such as Coca-Cola,

2. Pharmaceutical industry, such as Pfizer,

3, the electronics industry, such as Samsung mobile phones

4. Metal Heat Treatment Industry, Shougang Group

5, cable industry, such as Panda cable

6. Petrochemical industry, such as Shengli Oilfield,

In addition, nitrogen is used in many industries, and 3D printing is a new industry. We are willing to provide our professional nitrogen equipment to customers all over the world. To provide customers with better solutions.