With the automation and intelligent development of China's manufacturing industry, “machine substitution” is the trend of the times. Automated intelligent equipment that relies heavily on compressed air is widely used. Compressed air is becoming more and more important. The application of compressed air purification equipment in various industries It is also more and more extensive.

As the government vigorously advocates energy-saving retrofits, many companies choose to implement energy-saving retrofits on compressed air purification systems to increase production efficiency and reduce production energy consumption. So, what factors should companies consider when purchasing dryers?

First, understand the quality of existing compressed air, especially water content

To improve the dryness of compressed air and to carry out energy-saving transformation of production, we should first understand the quality of the existing compressed air of the enterprise.

Compressed air is mainly compressed by air through air compressor. The compressed air contains oil, water and impurities. The quality of compressed air can be determined by detecting the content of these three indicators. The important indicators of zui are: The amount of water.

The oil and impurities in the compressed air can be filtered through a high-efficiency precision filter, and the water can only be dried by a post-treatment purification device (dryer). It is worth noting that the general refrigerating dryer can only remove part of the liquid water by cooling, can not handle the standard, and most of the gaseous water remains in the compressed air, so this is "why many companies clearly have a dryer, workshop The reason is that there is still water in it.

To completely remove moisture from the compressed air, it can only be achieved by a core adsorption dryer. At the same time, equipped with high-efficiency precision filter, it can completely remove oil, impurities and water in compressed air, and the quality can reach the international 1/2 grade.

Different industries have different requirements for the quality of compressed air. The following are ISO8573/1 standard (typical compressed air quality classification) and industry standard JBT 5967-2007 (air quality grade for pneumatic components and systems). For the test data of the indicator, refer to the table below to understand the quality of the compressed air.

Pressure dew point

Oil content level

JB-T 5967-2007 solid particle content grade

Second, the quality requirements of compressed air in the industry

(1) Power industry

As one of the powers of power plants, compressed air has very high quality requirements. The humidity in the compressed air used in instrumentation is a strong inspection project in thermal supervision (the thermal power automation system maintenance operation procedure of thermal power plant DL/T774-2004-7.1) .4 instrument air source) is an indicator that must be controlled to ensure the safety and stability of the system.

In summary, according to GB/T13277-91 (commonly used compressed air quality grade standard), the compressed air quality grade requirements of the instrument are: solid particle grade 1, water content 2 grade, oil content grade 1, pressure dew point -40 °C Below .

(2) Pharmaceutical industry

The quality of the gas source used for the production of pharmaceuticals should meet the requirements of ISO8573-1 (GB/T13277-91) 1-2-1: solid particle size <=0.1um, oil content <=0.01mg/m3, pressure dew point below -40°C .

(3) Automobile manufacturing

In automobile manufacturing, the coating process requires high quality of the gas source, and the compressed air quality directly determines the quality of the body coating, which is a key process for automobile production.

According to the international standard for compressed air (ISO/DP8573/1 standard), the quality requirements of the coating equipment gas source: solid particle grade 1, water content 2, oil content 1 grade, pressure dew point requirement -40 °C or less .

(4) PCB industry

The PCB industry has high requirements for the quality of compressed air. The oil content needs to reach the first level, the solid particle level should reach the second level, the pressure dew point should reach level 3, and the dew point value should reach -20 °C .

Third, understand the drying effect of different brands of dryers

The quality of compressed air depends largely on the drying capacity of the dryer. Choose drying equipment to understand the technical advantages and product quality of different brands in the market.

Reference factors include: whether the drying effect of the dryer is up to standard, whether the running energy consumption is relatively low, and whether the subsequent replacement of the adsorbent is simple and easy .

Fourth, the air compressor pressure and pressure

The general-purpose aerodynamic compressor discharge pressure is 0.7 MPa, and the old standard is 0.8 MPa. The displacement is one of the main parameters of the air compressor. The air consumption of the dryer should match the displacement of the air compressor and leave a 10% margin.

(1) According to the level of exhaust pressure:

Low pressure air compressor exhaust pressure ≤1.0MPa

Medium pressure air compressor 1.0MPa<exhaust pressure ≤10MPa

High pressure air compressor 10MPa<exhaust pressure ≤100MPa

(2) The amount of exhaust gas is divided into:

Small air compressor 1m3/min<discharge volume ≤10m3/min

Medium air compressor 10m3/min<discharge ≤100m3/min

Large air compressor discharge capacity>100m3/min

The displacement of the air compressor refers to the free gas flow rate in the suction state.

Description: The shaft power <15KW and the exhaust pressure ≤1.4MPa are miniature air compressors.

According to the actual gas production volume and exhaust pressure of the air compressor, a reasonable post-processing equipment (dryer) can be configured to ensure the normal and stable operation of the air source system. If the configuration is unreasonable, the compressed air cannot drive the pneumatic tool.

Fifth, the air outlet temperature of the air compressor

In the energy-saving retrofit of compressed air, most companies will choose a dryer with adsorption function, and its adsorption characteristics determine the temperature at the end of the air compressor.

Different adsorption dryers are composed of different adsorbent materials, and the adsorption characteristics are different, and the adsorption capacity also varies with the environment.

For example, the adsorbent of the Beiteng core (module adsorption type) dryer is composed of a special adsorbent material, which has strong adsorption capacity and good drying effect.

When adopting the core dryer for energy-saving configuration, the enterprise should fully consider the outlet air temperature of the air compressor, and the appropriate temperature can make the adsorption time of the adsorbent less, the adsorption surface is wide, the adsorption effect is good, and the compressed air quality exceeds the expected transformation. effect.

Sixth, consider the use of gas occasions and conditions

If the gas field is small, you should choose a small model.

If equipped with a special machine room, use a large model, with a mobile air compressor for long-term installation.

Seven, consider the continuous operation effect and safety of the dryer

The adsorbent of the adsorption dryer has a certain service life and needs to be replaced periodically. The on-site filling and replacement is difficult to fill tightly, which may easily lead to the performance degradation or even failure of the dryer. At present, only the core technology can effectively solve this problem.

Because the double tower adsorption dryer belongs to the pressure vessel, there is a certain safety risk, and annual inspection is required every year. The module and core dryer are not in the category of pressure vessels, and the safety performance is high.

Dryer manufacturers must also have a comprehensive after-sales service system. Enterprises should purchase their drying equipment. Manufacturers should regularly inspect and maintain equipment and provide consumable replacement recommendations to ensure normal and efficient operation of the equipment.

In summary, when purchasing a dryer, the company can correctly evaluate the dryer through these standards, configure a good compressed air purification system, improve the manufacturing process, reduce production energy consumption, and improve production efficiency.

Shenzhen Beiteng Technology Co., Ltd.

Shenzhen Beiteng Technology Co., Ltd. is an innovative manufacturer of compressed air special purification equipment. Founded in 2005, its own brand "BITEMAN" core dryer, high efficiency precision filter, is Betten Technology The main product. Through eight years of technical improvement, the company has developed zui's new core-forming technology and passed ISO9001.2008 quality system certification in 2012. As a minority in the compressed air purification industry, it has 39 international and domestic patents. High-tech enterprises, Beiteng Technology has become one of the advanced equipment manufacturers in the world of compressed air special purification technology.