Adsorption dryer accessories, adsorbent

Category:

Adsorption dryer accessories

In adsorption dryers, the adsorbent is a crucial factor in ensuring the equipment's adsorption performance. Adsorbents are generally substances with a large specific surface area and high porosity. Adsorbents should meet the following conditions: 1. Strong adsorption capacity and large specific surface area; 2. No chemical reaction with the adsorbate and other contacting media; 3. Good mechanical and thermal strength; 4. Easy regeneration and resistance to degradation; 5. Mass production and low cost.

+86 13810858528

sales@ourinco.com

Product Quotation

Download

Product Information

Clean gas quality

High-efficiency plate-fin precooler, sufficient heat exchange, small inlet and outlet temperature difference
High-efficiency separator and reliable automatic electronic drain valve ensure that liquid water is separated and discharged

High-efficiency separator and reliable automatic electronic drain valve ensure that liquid water is separated and discharged

Large margin design, industrial-grade imported electric motor refrigeration compressor
Equipped with a hot gas bypass valve, the refrigeration system has high operating flexibility
Simple piping design, few welds, strong support, reducing the risk of pipeline leakage

Cost saving

Long maintenance interval, reducing the number of shutdowns for maintenance
Optimized refrigeration system, more energy-efficient than refrigerant tube-type dryers with the same processing capacity
Plate-fin high-efficiency heat exchanger, making full use of refrigeration capacity and reducing energy consumption

Simple design, small size and easy operation

Integrated design of precooler, evaporator and separator, compact structure
Convenient appearance design, easy on-site installation
New intelligent controller: integrates dew point display and fault alarm functions

Applicable environment

Tools and instruments
Control system
Spraying tools
Injection successful
Auto shop
Tire pressure

　　In adsorption drying equipment, the adsorbent is an important factor in ensuring the adsorption performance of the equipment. Adsorbents are generally substances with a large specific surface area and high porosity. Adsorbents should meet the following conditions: 1. Strong adsorption capacity, large specific surface area; 2. No chemical reaction with the adsorbate and other media in contact with it; 3. Good mechanical strength and heat resistance; 4. Easy to regenerate, not easy to deteriorate; 5. Can be mass-produced and low in price.

　　Currently, the adsorbents used in compressed air adsorption dryers include activated alumina and molecular sieves.

　　Activated alumina is dehydrated below 600℃ to produce a transitional state AI2O3, with a particle size of 3～7mm, white, high mechanical strength and heat resistance, does not soften, swell or crack when immersed in water, with a specific surface area of 300㎡/g, and has a high adsorption capacity. When used for compressed air drying, the water content per 1m³ of air can be reduced to 0.005g/m³, equivalent to a dew point of -64℃, and the regeneration temperature in the tower is 230～280℃. When the inlet temperature is 0～20℃, its adsorption effect is optimal, and it is a commonly used adsorbent for compressed air adsorption dryers.

　　Molecular sieve is a crystal with a cage-like pore skeleton composed of silicon (aluminum) oxygen tetrahedra. It is a high-efficiency and high-selectivity adsorbent with preferential adsorption capacity for polar molecules and unsaturated molecules. It has a particularly high affinity for water molecules. Drying gas with molecular sieves can generally achieve a dew point below -75℃, and it also has strong drying capacity for gases and liquids with high flow rates and temperatures. 13X and 4A type molecular sieves are commonly used, and their specific surface areas are all above 700m2/g.

　　The regeneration temperature of molecular sieves is relatively high. In industry, the regeneration temperature of molecular sieves is generally 150～300℃. If complete regeneration of molecular sieves is required to provide a dew point of -85～-100℃, the regeneration temperature is 315～375℃.

　　The disadvantages of molecular sieves are low mechanical strength and poor water drop resistance, and they are easily broken under pressure. When dealing with compressed air with high water load, it can be used in conjunction with alumina, that is, alumina is used for preliminary drying of compressed air, and then molecular sieves are used for deep drying of compressed air.

Adsorbent ceramic ball filler

Adsorbent molecular sieve filler

Adsorbent alumina filler

Molecular sieve

Index	Unit	Spherical		Strip
Diameter	mm	1.6-2.5	3-5	1.6	3.2
Static water adsorption	≥mg/g	270	270	270	270
CO2 adsorption	≥mg/g	180	180	180	180
Bulk density	g/ml	0.67±0.02	0.66±0.02	0.62±0.02	0.62±0.02
Compressive strength	≥N	30	80	30	65
Abrasion rate	≤%wt	0.1	0.1	0.1	0.1
Packaging water content	≤%wt	1.0	1.0	2.0	2.0

Activated alumina

Index Name	Al2O3 %	SiO2 %	Fe2O3 %	Na2O %	Ignition loss %	Loose density g/ml	Specific surface area m2/g	Pore volume ml/g	Crushing strength N/piece
Technical Requirements Requirements Requirements	≥93	≤0.10	≤0.04	≤0.45	≤7	≤0.75	≥280	≥0.40	≥30 1-2mm
	≥93	≤0.10	≤0.04	≤0.45	≤7	≤0.75	≥280	≥0.40	≥60 2-3mm
	≥93	≤0.10	≤0.04	≤0.45	≤7	≤0.75	≥280	≥0.40	≥100 3-5mm
	≥93	≤0.10	≤0.04	≤0.45	≤7	≤0.75	≥280	≥0.40	≥130 4-6mm
	≥93	≤0.10	≤0.04	≤0.45	≤7	≤0.75	≥280	≥0.40	≥160 5-7mm

Tables 11-2 to 11-4 show a comparison of the various properties of activated alumina and molecular sieves, as given in reference [32].

11-2 Physical Properties of Common Adsorbents

Type of Adsorbent	Density/(Kg/L)		Mechanical Strength	Thermal Conductivity/[W/(m.K)]	Specific Heat Capacity/[J/(Kg.K)]	Porosity (%)	Average Pore Diameter/nm
Type of Adsorbent	Bulk density	True Density	Mechanical Strength	Thermal Conductivity/[W/(m.K)]	Specific Heat Capacity/[J/(Kg.K)]	Porosity (%)	Average Pore Diameter/nm
Activated alumina	0.7～0.8	2.3～3.3	High	0.130 6	1 045	45～50	40～50
Molecular sieve	0.72	1.1	Limited	0.588 9	752	45	4.8

11-3 Water Absorption/Dehydration Performance of Common Adsorbents

Type of Adsorbent	Inlet Water Content (x10-6)	Outlet Water Content (x10-6)	Adsorption (%)		TSA Regeneration Temperature/℃
Type of Adsorbent	Inlet Water Content (x10-6)	Outlet Water Content (x10-6)	Static	Dynamic	Entering the Column	Leaving the Column	Highest
Activated alumina	160～240	1～3	22	4～6	230～280	100～150	350
Molecular sieve	160～240	1～3	22	8～15	320～370	120～200	475

11-4 Operating Conditions of Common Adsorbents

Type of Adsorbent	Adsorption Capacity		Water Droplet Stability	Heat Resistance	Alkaline Medium	Acidic Medium	Price
Type of Adsorbent	Low Partial Pressure	High Partial Pressure	Water Droplet Stability	Heat Resistance	Alkaline Medium	Acidic Medium	Price
Activated alumina	Low	High	Stable	High	Good	Poor	Relatively Expensive
Molecular sieve	High	High	Unstable	High	Good	Poor	Relatively Expensive