中文|ENGLISH

解决方案
Solutions

Air separation equipment

Location:Home > Solutions > Air separation equip... > PSA nitrogen plant...
  • PSA nitrogen plant

    PSA nitrogen plant
  • PSA nitrogen plant

    PSA nitrogen plant
  • PSA nitrogen plant
  • PSA nitrogen plant

The main factors of the development of PSA oxygen making technology include: High-performance programmable valve technology, high-performance oxygen-enriched adsorbent technology and process technology.At present, the above technologies are effectively solved. The imported German molecular sieve, the imported program-controlled valve and the domestic self-developed process can be used to prepare oxygen-enriched easily.

The PSA oxygen making equipment is an equipment which uses a special adsorbent to enrich the oxygen in the air at normal temperature by means of pressure swing adsorption technology. Pressure Swing Adsorption(PSA) is an advanced gas separation technology. Molecular sieves are used to perform pressure adsorption, pressure release desorption and cyclic operation. The product gas usually contains oxygen, argon and a small amount of nitrogen. Adsorbent is the core part of PSA oxygen making equipment. The PSA oxygen equipment chose imported 5A molecules.


The screen or self-developed adsorbent absorbs nitrogen, carbon dioxide, water and so on in the air, while oxygen can not be absorbed. Figure:


Product name: Pressure-changing adsorption oxygen making equipment   

Category to: Pressure swing adsorption apparatus

Yield (Nm3/h): 50, 80, 100, 120, 150

Product oxygen purity: 90%-95%

Product Oxygen Export Pressure: 0.4-0.5Mpa

Power consumption:≤0.35kwh/m3 O

Characteristics of Oxygen Production Equipment by Pressure Swing Adsorption:

  1. The molecular sieve has advanced performance, less consumption and long service life
  2. The oxygen output of the product is higher than other product.

  3. Compared with similar products, the equipment has the characteristics of producing unit nitrogen, low energy consumption and low consumption of cooling water.

  4. The whole set of equipment is highly automated.


Basic principles of oxygen production by pressure swing adsorption:

The basic principle of oxygen production by pressure swing adsorption is to separate oxygen and nitrogen by using the difference of adsorption performance of nitrogen and oxygen in air on zeolite molecular sieve(ZMS.) due to different pressure. According to the different desorption pressure of adsorption separation, we usually divide the pressure-
changing adsorption oxygen into two different processes, users can choose appropriate processes according to the different requirements of working conditions to achieve the purpose of the lowest unit consumption. The unit energy consumption of PSA equipment reaches 0.4~0.5KWh, which is equivalent to that of full low pressure, large deep cold air. 

It is competitive in equipment investment and operation cost.
1.Atmospheric pressure desorption PSA oxygen production

The compressed air removes solid impurities such as oil and dust and most gaseous water through a pretreatment system, enters an adsorption tower filled with a fluorite molecular sieve (ZMS.), the nitrogen, carbon dioxide and water vapor in the air are absorbed by the adsorbent, and the oxygen is separated through the adsorption bed. When the absorbed impurities in the adsorption tower reach a certain degree, the adsorption is desorbed to the atmosphere to regenerate the adsorbent. Under the control of PLC or DCS system, the adsorption separation system composed of two or three towers completes the continuous oxygen production, that is, the so-called atmospheric desorption variable pressure adsorption oxygen production (PSA-O)
2.Vacuum desorption pressure-swing adsorption oxygen production (VSA-O)
The raw material air after the blower is purified and removed dust and then enters the adsorption tower with zeolite molecular sieve (ZMS.). Nitrogen, carbon dioxide and water vapor in the air are absorbed by the adsorbent, and oxygen is separated through the adsorbent bed. When the absorbed impurities in the adsorption tower reach a certain degree, the adsorption and desorption of the atmosphere are carried out firstly, and then the adsorption agent is completely regenerated by vacuum pumping. Under the control of PLC or DCS system, the adsorption separation system composed of two or three towers completes the continuous oxygen production, that is, the so-called vacuum desorption variable pressure adsorption oxygen production (VPSA-O)

Characteristics of pressure swing adsorption equipment

Pressure swing adsorption is an advanced gas separation technology, which has an irreplaceable position in the field of gas supply in today's world. The main characteristics of pressure swing adsorption oxygen making equipment

  1. The device has the advantages of simple process flow, compact structure and low equipment investment.
  2. The device has small floor area and can be used for indoor and outdoor operation.
  3. The device is highly automated, and it is convenient to open and stop.
  4. The operation and maintenance cost of the device is lower than the deep cooling method.
  5. The device has strong independence, good stability, high reliability, working at normal temperature and low pressure, and good safety performance.
  6. The scale of the device can be from 0.2 to 5500 Nm3/h, and the purity of the product oxygen can reach 25 to 95%.
  7. Device outlet pressure: The atmospheric pressure desorption equipment 0.3-0.55MPa and the vacuum desorption equipment 15KPa. can be used with extended configuration pressurization.


Basic composition of oxygen making equipment by pressure swing adsorption

  1. Raw material air compressor or fan
  2. Gas source pretreatment system. (including oil removal, dust removal, water removal and cooling equipment)
  3. Adsorption tower (containing desiccant and molecular sieve)
  4. Raw material air and finished oxygen buffer tower

  5. Switching valve and gas distribution pipe

  6. Vacuum pump (for vacuum desorption process)

  7. Oxygen booster and filling device

  8. Equipment automatic control system and purity detection system

  9. Purity Regulation and Gas Distribution System (Configurations selected based on different processes and requirements)

Installation and operation conditions of pressure swing adsorption oxygen making equipment

  1. Installation conditions: The installation site shall be clean, smooth, and easy to reach and install the crane or forklift
  2. Usage environment requirements: The air around the installation site shall be clean, oil mist and corrosive gas, and the ventilation is good
  3. Supporting conditions: Power supply: 380V/50Hz/3 phase five line
  4. Cooling water: The invention is in line with the freezing and cooling water for industrial use.

Considerations for selection of variable pressure adsorption oxygen making equipment
  1. Before the specific type selection, the requirements of the final product gas of the required oxygen equipment are first confirmed, and the process of the required equipment is determined under the recommendation of the manufacturer.
  2. To examine the rationality of equipment design (each fitting set is reasonable, necessary, and play its maximum efficacy)
  3. Checking the reliability of equipment operation
  4. Research and development capability, manufacturing experience and level of manufacturers
  5. The cost of oxygen making equipment (equipment price, necessary water, electricity, site and its expenses, equipment maintenance cost, equipment service life) is calculated comprehensively, not only the price of equipment is considered.
Application      

steelmaking by electric furnaces, smelting of non-ferrous metals, and smelting of iron by enriching oxygen

Chemical Fertilizer Gas Production, Various Oxidation, Coal Gasification, Ozone Generation

Combustion-supporting and casting skypiercing furnace for industrial heating furnace

Oxygen Evaporation, Bleaching and Black Liquor Oxidation in Papermaking Industry

Treatment of Industrial Wastewater and Urban Wastewater by Oxygen Aeration Activated Sludge

Naphtha decomposition and carbon black production

High-density fish farming

Manufacture of iron-oxygen cement, refractory brick and glass processing in cement industry

Hospital oxygen delivery and health care oxygen, high pressure oxygen chamber and oxygen bar

Membrane separation method:

The separation of oxygen and nitrogen components in air is called membrane separation method by using the permeability selectivity of polymer film.The device for producing oxygen or nitrogen by the method has certain limitation in capacity and purity, and is generally mainly used for producing nitrogen products with the purity of less than 800Nm3/h and less than 99.5%.

The principle of membrane separation equipment for nitrogen production

It has been more than 100 years since the mass transfer process of membrane gas was calculated. A lot of researches have been done on the single gas transport in polymer and membrane. However, the practical application of membrane has been in recent decades. The most prominent example is the separation of isotope uranium in nuclear weapons. It was not until the late 1970's that the permeability and selectivity of gases in polymer membranes developed to industrial economic value that membranes were used on a large scale as they are today.

The hollow fiber membrane is a membrane assembly of hollow fiber filaments polymerized by thousands of polymer materials. When two or more gases are mixed through the polymer film, the penetration rate of different gas films is different due to the difference of the solubility and diffusion coefficient of various gases in the film. According to this characteristic, the gas can be divided into "fast gas" "slow gas".

The gas permeation through the hollow polymer membrane is a complex process. Its permeation mechanism is that gas molecules are first adsorbed on the surface of the membrane to dissolve, then spread in the membrane, and finally desorbed from the other side of the membrane. The membrane separation technology relies on the difference of the dissolution and diffusion coefficients of different gases in the membrane to realize the gas separation. When the mixed gas is under the action of certain driving force (pressure difference or pressure ratio on both sides of the film), the gas with relatively fast permeation rate, such as water vapor, oxygen, hydrogen, helium, hydrogen sulfide, carbon dioxide, etc., is removed at the permeation side of the film, and the gas with relatively slow permeation rate, such as nitrogen gas, argon, methane, carbon monoxide, etc., is retained at the retention side of the film and is enriched to achieve the purpose of separating the mixed gas.

Because of the limitation of the separation efficiency of the material selected by the membrane separator, the industrial component of the separator used for separating nitrogen from the air is more prominent with the hollow fiber membrane, and the industrial membrane component based on the large separation specific surface area of the hollow fiber can better meet the separation requirements of the customers, and generally, in order to obtain better economic indicators and achieve the purposes of low investment and low unit consumption, the membrane nitrogen making adopts a high-pressure process.

High pressure flow membrane nitrogen production

The compressed air removes solid impurities such as oil, dust and most gaseous water through the pretreatment system, enters into the membrane separator after preheating, and the gases with relatively fast permeation rate such as water vapor, oxygen, hydrogen, helium, hydrogen sulfide, carbon dioxide and so on penetrate the membrane, and are removed at the permeation side of the membrane, while the gases with relatively slow permeation rate such as nitrogen, argon, methane and carbon monoxide are retained at the retention side of the membrane and are enriched; Under the control of PLC or DCS system, the system can realize continuous and stable output nitrogen. The method of oxygen-nitrogen separation based on this principle is called high-pressure flow membrane nitrogen making (MKH-N).
Main Characteristics of Membrane Nitrogen Making Equipment:
  1. The device has the advantages of simple process flow, compact structure and low equipment investment
  2. The device size is small and can be used for indoor and outdoor operation
  3. The device is highly automated, and it is convenient to open and stop. Purity in 10 minutes
  4. The invention has no moving parts such as valve switching, does not need to replace the fragile parts regularly, and has little maintenance
  5. By increasing the membrane separator, it is easy to increase the nitrogen production
  6. The cost of operation and maintenance of the device is lower than that of PSA. In the range of 80-98% purity, the invention has excellent performance-price ratio. It has the incomparable advantage of other air separation methods, and the energy consumption is low.
  7. The device has strong independence, good stability, high reliability, working at normal temperature and low pressure, and good safety performance
  8. The device scale can be from 0.2-50000 Nm3 / h, and the purity of the product nitrogen can meet 80-99.9%
Main components of high pressure flow membrane nitrogen making equipment
  1.  Air compressor
  2. Air source pre-treatment assembly
  3. Air buffer tank
  4. Membrane separator
  5. Finished nitrogen buffer tank
  6. Switching valve and corresponding tube
  7. Automatic control and detection system
  8. Scalable decompression configuration pressurization system

Installation and operation conditions of membrane nitrogen making equipment

  1. Installation conditions: The installation site shall be clean, smooth, and easy to reach and install the crane or forklift
  2. Usage environment requirements: The air around the installation site shall be clean, oil mist and corrosive gas, and the ventilation is good
  3. Supporting conditions: Power: 380V/50Hz/3 Phase 5
  4. Cooling water: Refrigeration and cooling water conforming to industry
Considerations for selection of membrane nitrogen equipment
  1. Before the specific type selection, the requirements for the final product gas of the required nitrogen equipment are first confirmed, and the process of the required equipment is determined under the recommendation of the manufacturer
  2. To examine the rationality of equipment design (each fitting set is reasonable, necessary, and play its maximum efficacy)
  3. Investigate the reliability of equipment operation (confirm the rationality of guarantee measures in equipment design)
  4. Research and Development Capability, Manufacturing Experience and Level of Manufacturers
  5. Comprehensive calculation of the cost of nitrogen equipment (equipment price, the necessary water, electricity, site and expenses for putting into equipment, equipment use and maintenance costs, equipment service life), not just the price of equipment


Membrane-partitioning principle

The study of gas mass transfer in the membrane has been more than 100 years. A lot of researches have been done on the single gas transport in polymer and membrane, and the research has been developed in theory. However, the practical application of membrane has been in recent decades. The prominent example is the separation of isotope uranium in nuclear weapons. It was not until the late 1970's that the permeability and selectivity of gas in polymer membranes developed to industrial economic value that membranes were used on a large scale as they are today.

In general, the membrane is permeable to all gases, but only to varying degrees. The gas permeation through the hollow polymer membrane is a complex process. Its permeation mechanism is that gas molecules are first adsorbed on the surface of the membrane to dissolve, then spread in the membrane, and finally desorbed from the other side of the membrane. The membrane separation technology relies on the difference of the dissolution and diffusion coefficients of different gases in the membrane to realize the gas separation. When the mixed gas is under the action of certain driving force (pressure difference or pressure ratio on both sides of the film), the gas with relatively fast permeation rate, such as water vapor, oxygen, hydrogen, helium, hydrogen sulfide, carbon dioxide, etc., is enriched on the permeation side of the film, and the gas with relatively slow permeation rate, such as nitrogen gas, argon, methane, carbon monoxide, etc., is trapped on the retention side of the film and is enriched so as to achieve the purpose of separating the mixed gas.

Process for membrane separation oxygen making equipment

According to the different pressure in the separation condition, we usually divide the membrane oxygen production into two different processes, the user can choose the appropriate process according to the requirements of different working conditions to achieve the purpose of minimum unit consumption.

1.High pressure flow membrane oxygen production

The compressed air removes solid impurities such as oil, dust and most gaseous water through the pretreatment system, enters into the membrane separator after preheating, and the gases with relatively fast permeation rate such as water vapor, oxygen, hydrogen, helium, hydrogen sulfide, carbon dioxide and so on are enriched at the permeation side of the membrane, while the gases with relatively slow permeation rate such as nitrogen, argon, methane and carbon monoxide are retained at the retention side of the membrane and enriched; Under the control of PLC or DCS system, the system can realize continuous and stable output of oxygen.

2.Negative pressure flow process for oxygen production

The raw material air after the blower is purified and removed dust is then entered into the membrane separator, and the gas with relatively slow permeation rate, such as nitrogen, argon, methane and carbon monoxide, is accumulated on the retention side of the membrane and then discharged as exhaust gas, and the oxygen-enriched air on the permeation side is collected as the product gas by vacuum pumping. Under the control of PLC or DCS system, stable purity oxygen can be obtained continuously.

Characteristics of membrane separation oxygen making equipment

Main features of membrane oxygen-nitrogen separation equipment

  1. The device has the advantages of simple process flow, compact structure and low equipment investment
  2. The device have small size and can be used for indoor and outdoor operation
  3. The device is highly automated, and it is convenient to open and stop. Oxygen concentration in 10 minutes
  4. The invention has no moving parts such as valve switching, does not need to replace the fragile parts regularly, and has little maintenance
  5. By increasing the membrane separator, the oxygen-enriched air production can be easily expanded
  6. The operation and maintenance cost of the device is lower than PSA. In the range of purity 25-35%, the invention has excellent performance-price ratio. In combustion-supporting applications, it has the incomparable advantages of other air separation methods, and its operation energy consumption is low.
  7. The device has strong independence, good stability, high reliability, working at normal temperature and low pressure, and good safety performance
  8. The scale of the device can be from 0.2 to 50000 Nm3/h, and the purity of the product oxygen can reach 25 to 45%


Basic components of membrane separation oxygen making equipment

Main Components of High Pressure Process Equipment/Low Pressure Process Equipment

  1. Air compressor/1, blower unit
  2. Air Source Pre-treatment Assembly / 2, Dust Removal, Cooler
  3. Air buffer tank/3, membrane separator
  4. Membrane separator/4. Finished oxygen buffer tank
  5. Finished oxygen buffer tank/5, switching valve and corresponding pipe
  6. Switching valve and corresponding pipe/6, vacuum pump unit
  7. Automatic control, detection system/7, oxygen supercharger
  8. Scalable Pressurization System/8, Automatic Control, Detection System


Installation and operation conditions of membrane oxygen making equipment

  1. Installation conditions: The installation site shall be clean, smooth, and easy to reach and install the crane or forklift
  2. Usage environment requirements: The air around the installation site shall be clean, oil mist and corrosive gas, and the ventilation is good
  3. Supporting conditions: Power: 380V/50Hz/3 Phase 5
  4. Cooling water: Refrigeration and cooling water conforming to industry


Considerations for selection of membrane oxygen making equipment

  1. Before the specific type selection, the requirements of the final product gas of the required oxygen equipment are first confirmed, and the process of the required equipment is determined under the recommendation of the manufacturer.
  2. To examine the rationality of equipment design (each fitting set is reasonable, necessary, and play its maximum efficacy)
  3. Investigate the reliability of equipment operation (confirm the rationality of guarantee measures in equipment design)
  4. Research and Development Capability, Manufacturing Experience and Level of Manufacturers
  5. Comprehensive calculation of the cost of oxygen equipment (equipment price, necessary water, electricity, site and its expenses, equipment maintenance costs, equipment service life), not just the price of equipment











Return