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Home >> Industry Knowledge >> Nitrogen Generator (Nitrogen Equipment) knowledge
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Quality, volume, specific volume
That is, the weight of the quality of gas, often milligrams (mg), grams (g), kilograms (kg), metric tons (t) to express. The volume of gas which means the volume of the container. Often mm3 (mm3), cubic centimeters (cm3), cubic meters (m3) said. Is the specific volume occupied by unit weight of the material volume V with symbols that use gas volume units m3/kg, liquid specific volume l / kg, said.
Pressure, pressure, atmospheric pressure, absolute pressure, relative pressure
Movement of gas molecules on the vessel wall when the impact forces generated by that pressure. Of container per unit area is called the pressure generated by pressure. Pressure on the use of customary units of millimeters of mercury (mmHg) / square centimeters (cm2), international (legal metrology) Pa (Pa), kPa (kPa), MPa (MPa). After conversion 1mmHg = 133.3Pa = 0.1333kPa, 1MPa = 1000kPa = 1000000Pao1ATA = 0.1MPao.
Surrounded by very thick layer of the Earth's surface to the atmosphere or the surface of the earth's surface caused by the pressure of objects known as the "atmospheric pressure", symbols for the B; container or directly on the pressure surface, known as the "absolute pressure", the value of absolute pressure absolute vacuum as a starting point, symbols for PABS.
With pressure gauge, vacuum gauge, U-tube and other equipment to measure the pressure of called "sheet pressure" (also known as the relative pressure), "Table pressure" as a starting point to atmospheric pressure, symbols for the Pg. Is the relationship between: PABS == B + Pg.
Temperature, absolute temperature, relative temperature, critical temperature, critical pressure
Temperature thermal motion of material elements of the statistical average. Gas temperature is the gas molecules generated by thermal motion. Commonly used gas temperature at the unit (℃) said that the temperature of water ice 0 ℃. Frequently used in physics on the absolute temperature, with "K" said. Absolute temperature to -273 ℃ as zero. Celsius and absolute temperature is T = t +273. The British scientists often use "Fahrenheit", symbols for the oF.
Because any gas in the temperature and pressure that can be liquefied, the higher the temperature, liquefied by the need for higher pressure, but when the temperature exceeds a certain value, even if much of the pressure increase can not be liquefied, the temperature is called critical temperature , the lowest temperature in this pressure is called the critical pressure.
Dew point, evaporation, condensation
Is the gas saturation in the water has never become saturated steam temperature of steam, when not saturated steam into saturated steam, it appears fine dew, dew when the temperature there called the "dew point." Dew point and pressure, so atmospheric pressure and dew point (dew point pressure) and under the pressure of the sub-dew point. Atmospheric dew point is the moisture in the atmosphere under the pressure of the condensation temperature, dew point and pressure is the pressure of the water condensation temperature, the relationship between the two conversion (conversion table available), such as pressure 0.7Mpa pressure dew point for the 5 ℃ , the corresponding atmospheric pressure (0.101Mpa) dew point is -20 ℃. In the gas industry, in the absence of special note are referred to the dew point dew point at atmospheric pressure.
Refer to material evaporation from the liquid gas into the process, which includes evaporation and boiling. Condensation refers to the process gas into a liquid.
Purity
Gas purity is an important technical parameters. Nitrogen cite as an example, according to the GB purity nitrogen is divided into industrial use of nitrogen, nitrogen and three levels of high-purity nitrogen, and their purity were 99.5% (O2 less than or equal to 0.5%), 99.99% (O2 less than or equal to 0.01% ) and 99.99% (O2 less than or equal to 0.001%).
Flow, volume flow, mass flow
Flow refers to the process gas flow, per unit time through any cross-section of the gas volume. Flow expressed in two ways, namely, the volume of flow and mass flow. The former refers to any cross-section through the line of the gas volume of gas through the latter quality, in the gas industry in general are used to volume flow m3 / h (or L / H) for the units of measurement. Gas volume and temperature, pressure and humidity, and for the purposes of comparison generally refers to the volume flow standard state (temperature of 20 ℃, pressure 0.101Mpa, relative humidity of 65%), the flow at this time to Nm3 / h as a unit, "N" means that the state standards.
Compressed air
With the compressibility of air, the air compressor to make their own mechanical work done to reduce the volume, the increase in air pressure is called compressed air. Contains many impurities in compressed air: 1. The water, including water mist, water vapor, condensation water; 2. Oil: including oil, oil vapor; 3. A variety of solid substances such as: rust mud, metal powder, rubber powder, tar tablets and filters, sealing materials, such as the细末; in addition to a variety of harmful substances such as chemical smell. Can of compressed air pressure, temperature, adsorption and other methods to remove the water vapor. By heating, filtration, separation methods such as mechanical removal of liquid water.
Adsorption, membrane permeability
Adsorption is a gas in one or more components in the Selective porous solid surface concentration, adsorption of components to be known as the adsorption medium, known as the porous solid adsorbents. Adsorbent and adsorption media is a chemical bond connectivity, and the adsorption media analysis on lowering the temperature or pressure component in the middle pressure. Another component is adsorbed with the solid adsorbent to chemical reactions, known as chemical adsorption, chemical adsorption generally not renewable.
Membrane permeability refers to the process of gas purification polymer gas separation is based on one or more gas components from one side of membrane selective permeability to the other side. Component dissolved in the polymer film surface, and pass along the membrane to form a concentration of poor, poor concentration to maintain the membrane on the side of the partial pressure fraction is higher than the other side of the membrane component of the partial pressure.
Gas unit of measurement commonly used statutory
February 27, 1984 in accordance with the State Council, "China's reunification on the unit of measure to impose a legal order," the preparation of
Legal units of measurement: SI units
Legal units of measurement: International System of Units of non-unit
Quality, volume, specific volume
That is, the weight of the quality of gas, often milligrams (mg), grams (g), kilograms (kg), metric tons (t) to express. The volume of gas which means the volume of the container. Often mm3 (mm3), cubic centimeters (cm3), cubic meters (m3) said. Is the specific volume occupied by unit weight of the material volume V with symbols that use gas volume units m3/kg, liquid specific volume l / kg, said.
Pressure, pressure, atmospheric pressure, absolute pressure, relative pressure
Movement of gas molecules on the vessel wall when the impact forces generated by that pressure. Of container per unit area is called the pressure generated by pressure. Pressure on the use of customary units of millimeters of mercury (mmHg) / square centimeters (cm2), international (legal metrology) Pa (Pa), kPa (kPa), MPa (MPa). After conversion 1mmHg = 133.3Pa = 0.1333kPa, 1MPa = 1000kPa = 1000000Pao1ATA = 0.1MPao.
Surrounded by very thick layer of the Earth's surface to the atmosphere or the surface of the earth's surface caused by the pressure of objects known as the "atmospheric pressure", symbols for the B; container or directly on the pressure surface, known as the "absolute pressure", the value of absolute pressure absolute vacuum as a starting point, symbols for PABS.
With pressure gauge, vacuum gauge, U-tube and other equipment to measure the pressure of called "sheet pressure" (also known as the relative pressure), "Table pressure" as a starting point to atmospheric pressure, symbols for the Pg. Is the relationship between: PABS == B + Pg.
Temperature, absolute temperature, relative temperature, critical temperature, critical pressure
Temperature thermal motion of material elements of the statistical average. Gas temperature is the gas molecules generated by thermal motion. Commonly used gas temperature at the unit (℃) said that the temperature of water ice 0 ℃. Frequently used in physics on the absolute temperature, with "K" said. Absolute temperature to -273 ℃ as zero. Celsius and absolute temperature is T = t +273. The British scientists often use "Fahrenheit", symbols for the oF.
Because any gas in the temperature and pressure that can be liquefied, the higher the temperature, liquefied by the need for higher pressure, but when the temperature exceeds a certain value, even if much of the pressure increase can not be liquefied, the temperature is called critical temperature , the lowest temperature in this pressure is called the critical pressure.
Dew point, evaporation, condensation
Is the gas saturation in the water has never become saturated steam temperature of steam, when not saturated steam into saturated steam, it appears fine dew, dew when the temperature there called the "dew point." Dew point and pressure, so atmospheric pressure and dew point (dew point pressure) and under the pressure of the sub-dew point. Atmospheric dew point is the moisture in the atmosphere under the pressure of the condensation temperature, dew point and pressure is the pressure of the water condensation temperature, the relationship between the two conversion (conversion table available), such as pressure 0.7Mpa pressure dew point for the 5 ℃ , the corresponding atmospheric pressure (0.101Mpa) dew point is -20 ℃. In the gas industry, in the absence of special note are referred to the dew point dew point at atmospheric pressure.
Refer to material evaporation from the liquid gas into the process, which includes evaporation and boiling. Condensation refers to the process gas into a liquid.
Purity
Gas purity is an important technical parameters. Nitrogen cite as an example, according to the GB purity nitrogen is divided into industrial use of nitrogen, nitrogen and three levels of high-purity nitrogen, and their purity were 99.5% (O2 less than or equal to 0.5%), 99.99% (O2 less than or equal to 0.01% ) and 99.99% (O2 less than or equal to 0.001%).
Flow, volume flow, mass flow
Flow refers to the process gas flow, per unit time through any cross-section of the gas volume. Flow expressed in two ways, namely, the volume of flow and mass flow. The former refers to any cross-section through the line of the gas volume of gas through the latter quality, in the gas industry in general are used to volume flow m3 / h (or L / H) for the units of measurement. Gas volume and temperature, pressure and humidity, and for the purposes of comparison generally refers to the volume flow standard state (temperature of 20 ℃, pressure 0.101Mpa, relative humidity of 65%), the flow at this time to Nm3 / h as a unit, "N" means that the state standards.
Compressed air
With the compressibility of air, the air compressor to make their own mechanical work done to reduce the volume, the increase in air pressure is called compressed air. Contains many impurities in compressed air: 1. The water, including water mist, water vapor, condensation water; 2. Oil: including oil, oil vapor; 3. A variety of solid substances such as: rust mud, metal powder, rubber powder, tar tablets and filters, sealing materials, such as the细末; in addition to a variety of harmful substances such as chemical smell. Can of compressed air pressure, temperature, adsorption and other methods to remove the water vapor. By heating, filtration, separation methods such as mechanical removal of liquid water.
Adsorption, membrane permeability
Adsorption is a gas in one or more components in the Selective porous solid surface concentration, adsorption of components to be known as the adsorption medium, known as the porous solid adsorbents. Adsorbent and adsorption media is a chemical bond connectivity, and the adsorption media analysis on lowering the temperature or pressure component in the middle pressure. Another component is adsorbed with the solid adsorbent to chemical reactions, known as chemical adsorption, chemical adsorption generally not renewable.
Membrane permeability refers to the process of gas purification polymer gas separation is based on one or more gas components from one side of membrane selective permeability to the other side. Component dissolved in the polymer film surface, and pass along the membrane to form a concentration of poor, poor concentration to maintain the membrane on the side of the partial pressure fraction is higher than the other side of the membrane component of the partial pressure.
Gas unit of measurement commonly used statutory
February 27, 1984 in accordance with the State Council, "China's reunification on the unit of measure to impose a legal order," the preparation of
Legal units of measurement: SI units
Legal units of measurement: International System of Units of non-unit