The System Design Of Full-automatic Infilling Medicament In Sewage Disposing

Nowadays water resources are becoming more and more precious. As a result,sewage disposal and recycling become major issues worldwide. Among varioussewage disposal techniques, the use of flocculating agent and coagulation-supportingagent is an auxiliary measure that is absolutely necessary. Thus, the use of theequipment for dissolving and feeding such agent in the process of sewage disposal isquite common.For the old-fashioned and traditional sewage disposal techniques, mostly theiragent-feeding devices are controlled manually. With such controlling method certainproblems exist: the inaccuracy of the quantity of the agent, lack of timely response etc.Those problems directly affect the quality of sewage disposal. Moreover, as the priceof macromolecule flocculating agent is extremely high, the financial losses caused bythe inaccuracy of the quantity of the agent to be added are highly considerable.According to the practical operation in sewage disposal, this thesis provides acompletely automatic agent-feeding system. The mixing axle and the oar-shaped vaneare apt to vibrate and sway during the mixing process. In order to solve this problem,the finity block was used to determine the critical speed of the mixing axle, and thestrength of the oar-shaped vane was examined. Through analysis the designspecifications of the other main equipment of the whole system were given.The main strong points of this system:1)Both the dissolution tank and the storage tank are equipped with level indicators.The liquid level in the tanks and the operation information of various parts aretransmitted to PLC controlling system. Thus, the operation is completely automatic,the density of the agent is constant, the quantity of the agent is accurate;2)The design of the storage tank's volume is reasonable. It can meet both therequirement for the dissolution tank to let off the agent every two hours, and the flowrequirement for the measuring pump to feed the flocculating device continuously.3)After two hours' mixing in the mixing machine, a unique technique of agentsoakage is achieved. The uneven dissolution of the flocculating agent is avoided. Theheating depository can prevent the dry flocculating agent from agglomeration due todamp.4)The finity block is used to analyze the vibration of the mixing axle and to obtain theaxle's inherent frequency, which provides the basis for the correct rotate speed ofoperation. Therefore, the reliable and safe operation of the mixing axle is guaranteed.5)The rotate speed of the spiral feeder is adjustable. Hence, the quantity of the agentcan be adjusted according to the worksite conditions, the effective density of the agentis ensured;6)The controlling system is advanced, the operation is continuous, stable, safe andreliable;The aim of this thesis is to find a product whose practical value is higher and whoseapplication is wider. Ultimately, both environmental and economic benefits can beobtained.