Flow control method, device, system and medium of a diaphragm pump

Abstract

The invention discloses a flow control method and device for a diaphragm pump, comprising: obtaining the average flow Q3 of the isolation pump under different frequencies for a period of time; calculating the sludge overflow flow Q1=Q3 / K under different frequencies through Q3 , where K is the preset value; the frequency coefficient of each frequency interval is obtained according to the instantaneous flow rate of sludge overflow Q1; the frequency interval and corresponding frequency coefficient are determined according to the sludge overflow flow rate Q1 to obtain the operating frequency of the diaphragm pump, thereby realizing the flow rate control. The flow control method and device of the diaphragm pump of the present invention have the advantages of high control precision, smooth dosing and the like.

Description

technical field [0001] The invention mainly relates to the technical field of sludge treatment, in particular to a flow control method, device, system and medium of a diaphragm pump. Background technique [0002] After pretreatment and anaerobic digestion, the sludge needs to be dewatered for further disposal. In this process, before the digested sludge enters the plate frame, it is necessary to add ferric chloride to adjust the sludge properties, and ferric chloride is a strong corrosive agent. Among the existing equipment, only the diaphragm pump has a strong The corrosion resistance is excellent, and the dosing operation of ferric chloride can be realized. [0003] The sludge anaerobic digestion process currently adopts the natural overflow sludge discharge method, and its overflow flow Q1 is between 0-150 cubic meters per hour (such as figure 1 The height of the overflow port can be adjusted manually according to the process requirements, and the amount of sludge enter...

AI Technical Summary

Problems solved by technology

[0007] (1) The utility model patent with application number CN201420611331.4 provides "a diaphragm pump flow regulation control system", which has the following defects: ①The output flow of the diaphragm pump still has pulse phenomenon

②The pumping flow cannot be precisely controlled, only remote start and stop and the flow can be roughly controlled by controlling the opening of the regulating valve

[0008] (2) The utility model patent with application number CN201520230732.X provides "a flow stabilization device for a diaphragm pump", which has the following defects: ①The steady flow diaphragm pump of this device can only output a flow value, and cannot adjust the flow rate ;②The output flow of the device still has pulse phenomenon

[0009] (3) The invention patent with the application number CN201611060812.0 provides "an intelligent digital space mixed fertilizer acid-base control liquid level device", which has the following defects: ① There is no clear flow characteristic curve of the diaphragm pump, and the flow rate is not known Whether the characteristic curve is instantaneous flow or cumulative flow and what is the characteristic of the curve; ② It is not clear how to calculate the duty cycle of the diaphragm pump inverter signal

[0010] (4) The invention patent with application number CN201611249334.8 provides "a pneumatic double-diaphragm pump steady flow regulator", which has the following defects: ① the device can reduce the fluctuation range of the output flow of the diaphragm pump to a certain extent, But its pulse phenomenon still exists;

[0011] In addition, there are currently many types of devices to reduce the pulsation phenomenon of diaphragm pumps. For example, installing buffer devices (dampers and the like) on the pipeline can reduce the amplitude of the pulse, but it cannot eliminate the pulsation phenomenon.

If there is a device that can eliminate the pulsation phenomenon of the diaphragm pump, then the PID adjustment method can well achieve curvilinear dosing, which will lead to an increase in cost

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