The latest edition of compressed air purification terms (Chinese-English + paraphrase)

The latest edition of compressed air purification terms (Chinese-English + paraphrase)

1 Scope

　　 is suitable for general purpose compressed air purification field, other purposes (such as medical treatment, breathing, etc.) and compressed gas purification terms can be implemented by reference.

　　2 Normative references

　　 For all dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

　　3 basic concepts

　　3.1 　　 compressed air

　　 refers to air with an absolute pressure greater than 0.1 MPa.

　　3.2 　　 compressed gas 　　 refers to a gas with an absolute pressure greater than 0.1 MPa. 　　3.3 　　 environment ambient

　　 The area around the test equipment.

　　3.4 　　 ambient temperature

　　 The temperature of the environment around the device.

　　3.5 　　 pressure difference differential pressure

　　 pressure drop pressure drop

　　ΔP 　　 The measured pressure difference between the inlet and outlet of a component under specified conditions.

　　3.6 　　 adiabatic

　　The gas does not gain or lose heat content during expansion or compression.

　　3.7 　　 specific power

　　The ratio of the measured electric power consumption of the dryer to the actual volume flow rate of the compressed air processed under the specified operating conditions, in kilowatt minutes per cubic meter [kW/(m3/min)].

　　3.8 　　 rated flow rated flow

　　 The equipment flow rate designed according to the working conditions and confirmed by the test.

　　3.9 　　 equivalent rated flow equivalent rated flow

　　 The flow that maintains the same flow rate under pressure conditions different from the rated pressure given by the equipment manufacturer is the equivalent flow rate of the rated flow.

　　3.10 　　 equivalent flow velocity equivalent flow velocity

　　 When the test pressure is different from the rated pressure, the size of the test flow rate should be such that the flow rate under the test conditions is equal to the flow rate under the rated pressure and flow rate. The flow rate under the test conditions is called the equivalent flow rate.

　　3.11 　　 stabilization period

　　The time required for the average value to reach steady state conditions.

　　3.12 　　 purification

　　 According to the principles of physics, chemistry or biology, use relevant science and technology to process compressed air to remove pollutants in it, so that the quality of compressed air meets the requirements of relevant standards or usage.

　　3.13 　　 purification equipment equipment for purging

　　A general term for various equipment used to purify compressed air, such as gas/liquid separators, dryers, filters, etc.

　　3.14 　　 contaminant

　　Any solid, liquid or gas that has an adverse effect on the system.

　　3.15 　　 contamination

　　 Pollutants enter or exist in compressed air; or make the composition of compressed air change undesirably.

　　3.16 　　 contamination level contamination level

　　The amount of solid, liquid or gas in compressed air.

　　3.17 　　 test agent test agent

　　 is used as a designated reagent for equipment testing.

　　3.18 　　 test time

　　 The time from the stabilization time to the completion of recording the equipment performance data.

　　3.19 　　 dust

　　 Small solid particles with a particle size of about 0.1μm~150μm (settled by their own weight and can be suspended in the air for a period of time) generated by objects on the ground due to chemical, physical effects or crushing in the production process.

　　 3.20 　　 sterile

　　 There is no living or living organism.

　　3.21 　　 droplet

　　 Small mass liquid particles that can exist in the air in a suspended state. In turbulent flow, its particle size can even reach 200μm.

　　3.22 　　 suspension

In a two-phase system, one phase called the dispersed substance is all dispersed into the other phase called the dispersion medium.

　　3.23 　　 abrasion

　　 Material surface wear caused by the mechanical action between solids.

　　 3.24 　　 erosion erosion

　　 Material wear caused by the mechanical action of the fluid beam (with or without suspended solid particles).

　　3.25 　　 corrosion corrosion

　　 Material surface damage caused by chemical or electrochemical reactions between substances.

　　 3.26

　　 wear attrition/scouring

　　 scoring

　　 Loss caused by friction or wear.

　　 3.27 　　 agglomerate

　　 Two or more particles combine, join or form a particle cluster group in any form.

　　3.28 　　 coalescing

　　 The process of forming small droplets.

　　3.29 　　 regeneration

　　Pre-treat the drying device so that it can enter a new work cycle.

　　 3.30 　　 dust content

　　 The mass of particles contained in a unit volume of compressed air is converted to the value under the conditions of an absolute pressure of 0.1 MPa, a temperature of 20 °C and a relative water vapor pressure of 0 standard atmospheric pressure, and the unit is mg/m3.

　　3.31 　　 Suspended oil oil aerosol

　　Suspended liquid oil mixture suspended in a gas medium with negligible settling speed.

　　3.32 　　Oil content oil content

The mass of oil (including oil droplets, suspended particles, and oil vapor) in a unit volume of compressed air, converted to the value under the condition of an absolute pressure of 0.1MPa, a temperature of 20°C and a relative vapor pressure of 0 standard atmospheric pressure, in mg / m3. It is customary to express ppm, but it is not recommended.

　　3.33 　　Ppm

　　 A symbol that indicates the content of trace substances in a mixture, expressed in parts per million or parts per million.

　　3.34 　　 air/liquid separator air/liquid separator

　　 water separator

　　Oil/air separator oil/air separator

　　A device that separates pollutants from compressed air by relying on physical characteristics (such as the weight difference between gas and liquid or the centrifugal force of gas movement, etc.). It is generally used for coarse separation of larger solid particles and liquid droplets in compressed air.

　　 3.35 　　 cyclone

　　A device that separates mixed particles of a certain size from the airflow using a vortex method.

　　 3.36 　　 filter

　　A device that separates solid, liquid or gaseous pollutants from a fluid.

　　 3.37 　　 dryer

　　The equipment that reduces the absolute water content of compressed air by reducing the water vapor content so that the outlet relative humidity is less than 100%.

　　Note: Therefore, "separation" devices (such as cyclones) that can only remove large amounts of water are not dryers.

　　 3.38 　　 compressed air dryer compressed air dryer

　　A device that can reduce the moisture content in compressed air.

　　 3.39 　　 compressed air filter compressed air filter

　　A device that separates tiny pollutants from compressed air. Generally used for the fine separation of small solids and droplets in compressed air.

　　 3.40 　　 combined equipment for purging combined equipment for purging

　　 Use two or more single purification equipment to complete any two or more of the equipment combination of dust removal, water removal, oil removal and sterilization.

　　3.41 　　 isokinetic sampling

　　 isokinetic sampling

　　 During the sampling process, the air velocity in the sampling pipe is equal to the air velocity in the main pipe.

　　3.42 　　 wall flow

　　 The part of the liquid pollutants that are no longer suspended when the air flows in the tube.

　　3.43 　　 after cooling

　　After the compression is completed, the heat in the air is removed.

　　4 Compressed air dryer classification

　　4.1 　　 adsorption dryer adsorption dryer

　　 A dryer that separates the water vapor in the compressed air by means of the vapor or liquid water molecules being adsorbed on the surface of the adsorbent. It can be regenerated by removing moisture from the surface of the adsorbent.

　　4.1.1 　　 heatless regeneration

　　 By means of unheated, pre-dried and decompressed and expanded compressed air flowing through the adsorbent, the adsorbent is regenerated.

　　4.1.2 　　 there is heat regeneration heat regeneration

　　 Regenerate the adsorbent by increasing the temperature.

　　4.1.2.1 　　 directly heated directly heated

　　The regeneration is completed by heating the heating element in contact with or embedded in the adsorbent.

　　4.1.2.2 　　 air heating regeneration air heated

　　Use heated air to flow through the adsorbent to complete the regeneration.

　　4.1.3 　　 heat of adsorption heat of adsorption

　　 The heat released when the adsorbent adsorbs a substance.

　　4.1.4 　　 heat of compression dryer heat of compression dryer

　　A kind of adsorption compressed air dryer that uses the hot compressed air before entering the aftercooler (sometimes electric heating is needed to assist heating) to regenerate the adsorbent. This type of dryer is divided into two types with air consumption and zero air consumption.

　　4.1.5 　　 blower heated dryer blower heated dryer

　　A dryer that uses a blower to introduce ambient air and heat it by a heater to heat and regenerate the adsorbent.

　　 This type of dryer is divided into two types with air consumption and zero air consumption.

　　4.2 　　 refrigeration dryer refrigeration dryer

　　 A dryer that uses a refrigeration system to cool vapor to liquefy and remove it.

　　4.2.1

　　 direct expansion method direct expansion 　　The compressed air is cooled by evaporating the refrigerant flowing at high speed in the evaporator tube, and the water vapor in it is condensed to complete the drying.

　　4.2.2 　　 flooded evaporator

　　In a closed container, the compressed air is cooled by the evaporation of the refrigerant on the surface of the tank, and the water vapor in it is condensed to complete the drying.

　　4.2.3 　　 chilled water

　　 Use cooling water to cool the compressed air and condense the water vapor in it to complete drying.

　　4.2.4 　　 heat absorbing mass method

　　The compressed air is indirectly cooled by heat storage, and the water vapor in it is condensed to complete the drying.

　　4.2.5 　　 cooling energy storage

　　In the refrigeration cycle of compressed air drying, the compressed air is cooled by the refrigerant of the cold storage system, and the water vapor in it is condensed to complete the drying. When the cold capacity is surplus, the cold storage system can store the excess cold capacity, and when the cold capacity is needed, it is provided by the cold storage system.

　　4.2.6 　　 cycling dryer cycling dryer

　　 A dryer that adapts to load changes by starting and stopping the refrigerant compressor to achieve energy saving.

　　 4.2.7 　　Non-cycling dryer non-cycling dryer

　　 Dryer in which the refrigerant compressor runs continuously without starting and stopping during operation.

　　4.3 　　 absorption dryer absorption dryer

　　The drier that uses absorbent and water vapor to generate a solution to separate water vapor from compressed air, the absorbent is generally not recovered.

　　4.4 　　 combined dryer combined dryer

　　 A dryer that completes drying through the combination of more than one drying system.

　　4.5 　　 membrane dryer membrane dryer

　　 A dryer that separates water vapor in compressed air by means of a special microporous tube bundle.

　　4.6 　　 integrated dryer integrated dryer

The dryer connected to the main compressor unit (such as the integrated refrigeration dryer), or its operation and performance largely depend on the dryer of the integrated compressor (such as the heating of the compression dryer) ).