Automatic medicine adding system

Abstract

The invention belongs to a medicine adding device, and particularly discloses an automatic medicine adding system which comprises a high-concentration medicine chest, a low-concentration medicine chest, a pump, a second metering pump and a medicine adding pump, wherein the pump and the second metering pump are respectively connected with the high-concentration medicine chest and the low-concentration medicine chest under the action of a control system; the medicine adding pump is connected with the high-concentration medicine chest; output of the second metering pump are respectively communicated with a premixing device and input of a secondary reaction tank; the premixing device is communicated with the secondary reaction tank through a pipeline; raw water is connected with the input of the premixing device through a second electromagnetic valve and an electromagnetic flow meter; first and second probe signal acquisition ends are respectively arranged at a material input port and a material output port of the premixing device; one path of output of the secondary reaction tank is connected with a discharging device while the other path of the output of the secondary reaction tank is connected with an input end of the premixing device through a return pipeline; a third probe signal acquisition end is arranged at an output end of the secondary reaction tank; and probes and the electromagnetic flow meter are respectively connected with signal input of the control system. The medicine adding device is capable of solving the problems that the medicine addition in the prior art is inaccurate and the like, and has the advantages of being accurate in medicine addition, simple in operation, easy to realize automatic control and the like.

Description

technical field [0001] The invention belongs to a dosing device, in particular to an automatic dosing system that can be widely used in various industries such as chemical industry, environment and biology. Background technique [0002] In the water treatment process of environmental engineering, it is often necessary to add chemicals to it to achieve water purification. The purpose of adding chemicals is pH neutralization, chemical precipitation, chemical reduction, etc. If the dosage is too large, it will inevitably cause waste of chemicals, or even Affect the effect of wastewater treatment. For some situations where the requirements for chemical dosing are strict, imprecise chemical dosing will inevitably lead to serious consequences. For example, methanogenic bacteria in anaerobic reactions need a pH condition of 6.8-7.2, and methanogenic bacteria cannot reach pH conditions beyond this range. Normal survival will lead to acidification of the anaerobic system, seriously a...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing dosing system only uses metering pumps for dosing, and the dosing amount is a fixed value, which is generally suitable for operating conditions with stable water quality and quantity, and cannot be adjusted in real time according to changes in water quality and water quantity. At the same time, due to the fixed dosage, Inaccurate control of the final control indicators of the system can easily lead to too little or too much medicament dosage

The actual water quality and quantity fluctuate greatly, and there is a big difference between the fixed dosage and the actual wastewater demand for chemicals. The current dosage method will inevitably lead to waste of chemicals or poor treatment effect. The automatic dosing system that adjusts the dosing amount in time according to the water volume is very necessary to realize the precise control of the system dosing amount

[0004] The utility model patents of patent No. 201120222489.9 and 200720081498.4 have improved the traditional dosing technology respectively, but their scope of application is limited. The utility model patent of patent No. 201120222489.9 is only applicable to acid-base neutralization, while the patent No. is The utility model patent of 200720081498.4 is suitable for coagulation reaction. The problems of the two patents are: the control of the dosing process is not accurate enough. Since the dosing is done at one time, there is no fine-tuning system for the system, and the control of the target value of the system is difficult to achieve. Dosing error

Although the utility model patent with the patent number 201120222489.9 has a chemical backflow system, due to large dosing errors, it is easy to cause repeated circulation of wastewater, which not only causes waste of acid and alkali, but also increases the waste water by neutralizing the excess acid and alkali for multiple times. Salt content

The utility model patent with the patent number of 200720081498.4 is only suitable for a wide range of coagulant dosing. Due to the lack of a fine-tuning system, it is easy to cause excessive coagulant dosing, resulting in waste of chemicals.

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