Air displacement stepless regulating method for reciprocating-piston compressor

A compressor exhaust, reciprocating piston technology, applied in mechanical equipment, machines/engines, liquid variable-capacity machinery, etc., can solve the problems of weakening amplitude and speeding up the frequency of fluctuations, so as to reduce pressure fluctuations, increase reliability, The effect of improving the service life

Inactive Publication Date: 2008-05-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the discharge buffer volume of the compressor can slow down the pressure fluctuation, but cannot weaken its amplitude; if the pressure difference between the upper and lower limits is reduced, the frequency of the fluctuation will be accelerated
This is an inherent defect that the switch control strategy cannot overcome

Method used

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  • Air displacement stepless regulating method for reciprocating-piston compressor
  • Air displacement stepless regulating method for reciprocating-piston compressor
  • Air displacement stepless regulating method for reciprocating-piston compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] With a speed of 980r / min and a rated displacement of 3m 3 / min single-stage air compressor as an example. Implementing the present invention requires an actuator and a control system that can press open the suction valve, and the control system operates as follows:

[0034] (1) Determine the characteristic parameter N of the actuator, which means that the actuator completes a complete set of actions, including pressing-holding-release, the minimum number of work cycles experienced, so N is determined by the response speed of the specific actuator. The characteristic parameter of the actuator in this embodiment is N=10, so a working unit is composed of 10 working cycles.

[0035] (2) The maximum displacement of the compressor at full load is Qm=3m 3 / min.

[0036] (3) Assume that the actual production required displacement Qr = 2.4m 3 / min, the duty cycle is:

[0037] R%=[Qr / Qm×100]%=[2.4 / 3×100]%=80%

[0038] (4) The actuator operates in the following way: with 100...

Embodiment 2

[0045] In Embodiment 1, 100 working units are taken as a control cycle, and the control cycle can be adjusted when a higher requirement is placed on the uniformity of the exhaust gas. The operation steps are as follows:

[0046] Steps (1), (2) are the same as in Example 1.

[0047] Step (3) still assumes that the actual production exhaust volume Qr=2.4m 3 / min, the duty cycle is:

[0048] R%=[Qr / Qm×100]%=[2.4 / 3×100]%=80%

[0049] (4) The actuator operates in the following manner: with 40 work cycles as a control cycle, 32 loading work units are executed first, and then 8 no-load work units are executed; the loading work unit accounts for 80% of the control cycle, and compression The machine still works according to the duty cycle.

[0050] (5) If the gas volume required for production has not changed, repeat the above step (4); if it needs to be changed, perform steps (3) to (4) to calculate with the new required gas volume.

[0051] For example, if the required gas volum...

Embodiment 3

[0056] Take a certain L-13 / 7-250 natural gas compressor as an example, the speed is 740r / min, and the rated displacement is 780m 3 / h, divided into 3 levels, a total of 3 cylinders, which are respectively cylinder 1, cylinder 2 and cylinder 3 according to the process. Implementing the present invention requires a centralized control system, and each of the three cylinders is equipped with an actuator that can press open the suction valve, and the centralized control system operates as follows:

[0057] (1) Determine the characteristic parameters N1, N2, and N3 of each actuator, which means that each actuator independently completes a complete set of actions, including the minimum number of work cycles experienced by pressing-holding-release, so N1~N3 is determined by the specific implementation The agency's speed of response will determine. The characteristic parameters of the actuator in this embodiment are N1=10, N2=20, N3=25.

[0058] (2) The maximum displacement of the c...

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PUM

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Abstract

The invention discloses a stepless adjustment method for the discharge volume of a reciprocating piston compressor. The method determines the duty ratio by the maximum discharge volume of the full-load operation of the compressor and the actual required discharge volume. Through a control system and a Or multiple actuators that can press open the suction valve to control the forced opening or free opening and closing of the compressor suction valve, so that the compressor loading cycle and no-load cycle are distributed at intervals and in line with the duty cycle, so as to uniformly provide all Exhaust volume required. The invention has the effect of realizing continuous adjustment of exhaust volume from 0 to 100%, small pressure fluctuation, energy saving and noise reduction, and simple and reliable adjustment.

Description

technical field [0001] The invention relates to a flow regulating method, in particular to a method for regulating the displacement of a reciprocating piston compressor. Background technique [0002] Reciprocating piston compressors (hereinafter referred to as compressors) are widely used in industry and daily life, and are one of the essential key equipment in various sectors of the national economy, especially in petrochemical and other process industries. The rated discharge capacity of the compressor remains basically unchanged under normal operating conditions. Generally, it is designed or selected according to the maximum flow rate required by the process, and the discharge capacity has a certain margin. On the other hand, in actual use, changes in the working conditions of gas-consuming equipment such as inlet pressure, temperature, and medium composition, changes in production conditions, and changes in market demand often occur, resulting in users' consumption of ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/00
Inventor 顾兆林侯雄坡李云王存智冯诗愚高秀峰
Owner XI AN JIAOTONG UNIV
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