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In recent years, reciprocating compressors have been widely used in China's natural gas long-distance pipeline transportation, natural gas processing, gas well injection and production processes, and are also the main energy-consuming equipment in natural gas production. How to minimize the energy consumption of reciprocating compressors is a difficult problem for management technicians. For this reason, the author studies and analyzes the technical problems of energy saving and consumption reduction of reciprocating compressors.
1 Calculation formula of compressor indicating power The indicated power of the reciprocating compressor is the total amount of work consumed by the compressor cylinder in the working cycle, which is represented by i; the indicated amount of power consumed per unit time is called the indicated power. , using the condition.
The calculation formula of the indicated power of the actual compression process is: the indicated power calculation formula is: the added power. Therefore, as the population pressure decreases, the power of the compressor also decreases. 3. When the s of the compressor is less than 1.1, the power reduced by the decrease in the compressor displacement due to the decrease in the suction pressure is lower than the power increased by the s rise. . Therefore, as the population pressure decreases, the power of the compressor increases; as the population pressure increases, the power of the compressor decreases. 4. The effect of the exhaust pressure on the displacement and power of the compressor is shown by As the outlet pressure increases, the power of the compressor increases, the displacement decreases, and the power of the compressor increases by 1.3% to 3.5% for every 0.1 MPa increase in exhaust pressure. The results also show that when the population pressure is 1.0 MPa. When the outlet pressure is increased from 2.5MPa to 2.6MPa, the power of the compressor is increased by 3.5%. When the outlet pressure is increased from 3.8MPa to 3.9MPa, the power of the compressor is only increased by 1.4%. Increase, the increase in compressor power gradually slowed down.
3.3 Influence of intake pressure Assume that the compressor has 4 cylinders, the diameter is 317.5mm, the piston stroke is 152.4mm, the outlet pressure is fixed at 3.0MPa, and the compressor is first-stage compression. The compressor performance calculation software is used to simulate the influence of the change of the intake pressure of the compressor on the displacement and power of the compressor. It is also assumed that the compressor adopts a three-stage compression mode, and the outlet pressure of the compressor is fixed at 3.0 MPa. When the population pressure changes from 0.02 to 0.07 MPa, the compressor performance calculation software is used to calculate the influence of the compressor group population pressure on the unit's power and displacement.
For single-stage compression and multi-stage compression, see the results of the compressor inlet pressure on the unit's displacement and power.
It can be seen that for single-stage compression, when the outlet pressure of the compressor is fixed, as the compressor population pressure increases, the displacement of the compressor gradually increases; the compressor population pressure rises from 1.0 MPa. At 1.4 MPa, as the intake pressure continues to increase, the power of the compressor gradually increases, and when the intake pressure rises from 1.4 MPa to 2.5 MPa, as the intake pressure increases, the power of the compressor instead Gradually decreases. When the compressor adopts multi-stage compression, when the outlet pressure of the compressor is fixed, as the compressor inlet pressure increases, the displacement and power of the compressor gradually increase.
According to the calculation formula (2) of the compressor indicated power, the influence on the compressor power depends on which of the two factors of the compressor displacement and s is the main factor. When s is greater than 1.1, the power of the compressor is reduced due to the decrease of the suction pressure, and the power reduced by the s is increased. The exhaust gas is increased by the amount of power and the power is discharged. Analysis and simulation of compressor performance yielded measures to optimize the operation of the reciprocating compressor and reduce energy consumption. It is recommended to pay attention to improve the operating conditions of the compressor, arrange the pipeline reasonably, and minimize the loss of pipeline resistance. When designing or installing the pipeline, the length of the pipeline should be shortened as much as possible. The cooler with high thermal conductivity and easy cleaning should be selected and the air cooler of the unit should be cleaned regularly.
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