Research on Matching Relationship between Gas Consumption of Pneumatic Machinery and Volume Flow of Air Compressor

The intrinsic relationship with the nominal gas consumption of pneumatic machinery is studied, and the calculation formulas associated with the two are derived. The calculation method for solving the reasonable matching of gas production and gas consumption due to different environmental conditions (pressure and temperature) is proposed. And the manufacturer and manager of the pneumatic machine manufacturer and the pneumatic pneumatic machine-air compressor combination system.

Mobile Screw Air Compressor II. Basic Process Definition and Simplified Conditions 1. Air Compressor and Pneumatic Mechanical Air/Compressed Air Flow Air compressor and pneumatic mechanical air/compressed air system flow chart are shown.

(1) Process 1 From the sequence number 1 to the serial number process, the air in the atmospheric state (parameter A/ra/va/ is compressed by the air compressor and becomes compressed air (parameters are discharged from the compressor exhaust pipe).

(2) Process 2: From the serial number to the serial number 3 process, the compressed air discharged from the exhaust pipe of the compressor passes through the intermediate equipment/facilities between the air compressor and the pneumatic machine, such as a gas storage tank, a valve, a dryer. After the filter, piping and pipe joints (one or more, or even all of the many equipment/facilities), reach the air intake of the pneumatic machine (parameters;

(3) Process 3 From the sequence number 3 to the sequence number 4 process, the compressed air passes through the pneumatic mechanical work component (such as the air motor), and is discharged from the exhaust pipe to return to the atmospheric state (parameter zVr/iV/O. 2. Air pressure The relationship between the actual volume flow rate and the nominal air volume flow rate in the standard suction state, when the exhaust pressure reaches the specified value, the volume flow rate of the air compressor is the nominal volume flow rate (vaeF). The volume indicated on the nameplate of the air compressor product. The flow rate is the nominal volume flow.

Product standard for screw air compressors. TB/T6430 "General Power Screw Air Compressor" specifies the standard state of the screw air compressor: atmospheric pressure l.Obar (lbar = 0.1MPa, the same below), temperature 20 ° C, relative humidity 0%. This state also It is the "Engineering Standard Atmosphere (AER)" state in the GB/T28783-2012/ISO8778:2003 standard.

From the equation of state, it is easy to calculate the standard air density of the engineering standard atmosphere (AER): the lubricating oil injected into the air compressor of the oil jet screw seals the inner leakage passage of the main machine of the screw machine, and the internal leakage is small; the cooling effect of the lubricating oil The exhaust temperature of the compressor can always be maintained within the specified range; in the actual application, the model of the screw air compressor is determined, and the exhaust pressure and the rotational speed of the screw air compressor are determined. When the pressure loss of the screw air compressor before and after the stage is controlled within the specified range, the influence of the suction condition (atmospheric conditions) on the volumetric efficiency of the screw machine is very small, and the volumetric efficiency can be approximated as a fixed value. . Therefore, the actual inlet volume flow of the screw air compressor is also approximately constant, that is, there is: yaer engineering standard atmospheric (AER) state volume flow, the unit is m3 / min. 3. The actual gas consumption and nominal gas consumption of pneumatic machinery Under the specified conditions, the volume of free air in the standard state consumed by the pneumatic machine in unit time is the nominal gas consumption (Va) of the pneumatic machine. Under normal circumstances, the (load) air consumption on the nameplate of the pneumatic mechanical product is the nominal air consumption of the equipment. The standard air consumption of the standard 2003 standard 〃 pneumatic standard atmosphere (7 \ "state: atmospheric pressure 1. (3! ', temperature 20 ° (:, relative humidity 65%. Import state air compressor and pneumatic machine air flow Fig. Pneumatic machine out rs state U (atmospheric state> From the equation of state, it is easy to calculate the density of the air in the aerodynamic standard atmosphere (ANR) state: when comparing the selection, the influence of atmospheric conditions must be considered and corrected by the atmospheric influence coefficient. The correct matching of the gas production of the air compressor with the gas consumption of the pneumatic machine is achieved.

Calculation In order to explain the magnitude and influence of the atmospheric influence coefficient value, the altitude parameter and the atmospheric pressure parameter in "US STANDARDATMOSPHERE (1976)" are used as the calculated values, and the atmospheric influence coefficient is calculated according to the equation (13).

Atmospheric pressure, atmospheric temperature, gas constant density, atmospheric influence coefficient (when the heart changes, the atmospheric influence coefficient becomes larger, the energy consumption of the air compressor will become larger (that is, the specific power will become larger), and the actual energy consumption is not equal to Energy efficiency indicators under standard conditions.

When selecting the air compressor for the pneumatic machine of the mine, it is not only necessary to increase the volume capacity of the air compressor proportionally. It is also necessary to adjust the configuration of the motor or diesel engine that drives the screw air compressor. This is not atmospheric. The coefficient is approximately 1.0. At this time, the nominal volume flow of the air compressor and the nominal air consumption of the pneumatic machine can be equal.

The gas influence coefficient value is large. The higher the altitude, the lower the pressure and the greater the impact.

It should be reminded that the above table is only used as a calculation example because the weather conditions in China are negligible with "U.SSTANDARDATMOSPHERE."

Air compressors and mine pneumatic machines are important in the gas-fired combined gas system in mines. 2003 specifies the standard state for evaluating the volume flow of the two, and the volume flow is comparable. When the working pressure of the pneumatic machine and the nominal gas consumption are constant, the air compressor should be selected or designed to fully consider the atmospheric influence coefficient.

Due to the wide distribution of mines in China and the great geographical differences, the designers and managers of air compressors and pneumatic machines, as well as the designers and managers of air compressors and pneumatic mechanical systems, should fully inquire about the meteorological conditions of the target mines. Correctly determine the atmospheric influence coefficient of the air compressor to ensure a reasonable match between the air compressor and the pneumatic machine.

(1976) is not consistent. For practical applications, the atmospheric influence coefficient and the volumetric flow rate of the screw air compressor can be calculated according to the atmospheric condition parameters of the major cities in the standard GB50178-1993 "Building Climate Division Standards" according to equations (13) and (14). For mines in the mountains and rivers, it is required to inquire the local meteorological data to determine the volumetric flow of the screw air compressor.

Due to the wide geographical area of ​​China, the temperature difference between the north and the south is large, the difference between east and west is large, the temperature difference between summer and winter is large, and the atmospheric conditions are very different. The atmospheric influence coefficient cannot be ignored. For example, the Yunnan-Guizhou Plateau with abundant mineral deposits and the Qinghai-Tibet Plateau, the pneumatic machinery of the mine must consider the atmospheric influence coefficient to increase the volumetric flow specification of the air compressor; if necessary, design the air compressor according to the climatic conditions to meet the gas demand of the pneumatic machinery.

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4.Operating temperature: -10~50℃

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Applied torque: (T)

Test Temperature: 23+/-5℃

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Rotating speed:20r/min

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Test Temperature: 23±5℃

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