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A method for preventing plunger pump from pumping out based on monitoring output pressure

A technology for monitoring output and output pressure, which is applied in pump control, pump testing, liquid variable capacity machinery, etc. It can solve the problems of pump emptying, small change, poor stability, etc., and achieve the effect of accurate detection method

Active Publication Date: 2018-02-09
JEREH OIL & GAS ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the application of L-CNG plunger pumps in the industry generally has problems of high failure rate and poor stability, the most prominent of which is the phenomenon of pump emptying
If the pump is evacuated for a long time, it will directly cause damage to the pump and affect the operation of the gas filling station
[0004] There are certain defects in judging whether the plunger pump is evacuated by detecting the current and pressure difference of the plunger pump, especially when the pump is evacuated during operation, the outlet pressure of the pump is high and the change is small, and the above method cannot be accurately judged

Method used

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  • A method for preventing plunger pump from pumping out based on monitoring output pressure
  • A method for preventing plunger pump from pumping out based on monitoring output pressure
  • A method for preventing plunger pump from pumping out based on monitoring output pressure

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Embodiment 1

[0039] Such as figure 1 with image 3 As shown, a method based on monitoring the output pressure to prevent the plunger pump from evacuating, including the plunger pump and the outlet pipeline, is characterized in that a pressure data acquisition control device is arranged on the outlet pipeline, and the collected pressure data The processing method is as follows:

[0040] 1) Obtain the average value of the output pressure P0: continuously collect a set of pressure data, remove the maximum and minimum values, and obtain the average value of the rest to obtain P0; set the output pressure setting tolerance ΔP, then the normal output pressure range is: upper limit P0 +ΔP, above the P0+ΔP line is called the peak region; (meaning that P0 is greater than P0+ΔP); the lower limit P0-ΔP; below the P0-ΔP line is called the valley region (meaning that P0 is less than (P0-ΔP)); and Set the peak area counter A and the valley area counter B respectively; set the allowable difference betwe...

Embodiment 2

[0055] Such as figure 2 with image 3 As shown, this embodiment is another way of judging evacuation, on the basis of the scheme of embodiment 1: it also includes when the collected pressure data Px is continuously within the peak region and the valley region, but does not appear in the peak region and the valley region Judgment of other pulsating data: that is

[0056] In step 4) above, is Px between the peak domain and the valley domain? If so, then return to step 2) after judging the number of times continuously falling into the peak area and the valley area), set the number of times counter W of Px in the peak area and the valley area, the set limit that the W data reaches The value is M; the specific steps are as follows:

[0057] 8) If Px is outside the peak area and valley area, clear the counter W; if Px is within the peak area and valley area, add 1 to W, and judge whether W is greater than M, if W≥M, Then go to step 9); otherwise go directly to step 2)

[0058] 9...

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Abstract

The invention relates to the technical field of monitoring of plunger pumps, in particular to a method for preventing evacuation of a plunger pump based on monitoring of the output pressure. The method relates to the plunger and an output pipeline, and is characterized in that a pressure data acquisition control device is arranged on the outlet pipeline; and a data processing method comprises the following steps that (1) the average value P0 of the output pressure is obtained, specifically, the output pressure setting tolerance delta P is set, the domain above a P0+delta P line is called a peak domain, and the domain below a P0-delta P line is called a valley domain; a peak domain counter A and a valley domain counter B are set correspondingly; the allowable difference value between the peak domain counter A and the valley domain counter B is the numerical value C; and an out-of-tolerance time counter D and an upper limit E are set; (2) pressure data Px is acquired; (3) abnormal data are removed; (4) the number of times of Px falling into the peak domain and the valley domain is calculated; and (5) whether the out-of-tolerance time D of the difference value between the peak domain counter A and the valley domain counter B exceeds a preset value E or not is judged, and if yes, an evacuation alarm is given out. Compared with a detection method in the prior art, the method is accurate and reliable, and false alarms are avoided.

Description

technical field [0001] The invention relates to the technical field of plunger pump monitoring, in particular to a method for preventing a plunger pump from pumping out based on monitoring output pressure. Background technique [0002] The plunger pump is a pumping equipment commonly used in industrial production, which can pump high pressure, but once it is evacuated, it will cause direct damage to the pump. For example, in the L-CNG filling station, the low-temperature and low-pressure LNG liquid in the storage tank is pressurized to about 20MPa by the plunger pump, and then it is converted into normal temperature and high pressure gas through the high pressure vaporizer and air, and is distributed by the sequence control panel It is stored in the high-pressure gas storage cylinder group, and finally the vehicle-mounted gas storage cylinder is filled by a CNG gas dispenser. The plunger pump is the key equipment for converting LNG from liquid to gas. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/06F04B51/00
CPCF04B49/06F04B51/00
Inventor 张泽华李建举柳晓伟王文鑫
Owner JEREH OIL & GAS ENG
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