The microcomputer monitors the turbidity of the precipitated water and realizes the second closed-loop control. At the same time, the measured value set value, the concentration of the liquid medicine, the frequency converter, the frequency current, the metering pump, the speed, the flow rate, the total amount of the drug, the turbidity of the precipitated water, and the like, and the data is reported to the central control room microcomputer in real time. According to the characteristics of the water plant self-control communication data is small, the communication rate is not high, and the Liuzhou Railway Water Plant automatic drug delivery system and the central control room host computer use serial communication. Because the central control room of Liuzhou Railway Water Plant is far away from the drug administration, it is proposed to adopt a communication protocol. The relevant parameters are rate, no parity, bit data, bit stop bit. The drug administration office and the central control room are point-to-point communication, and the drug delivery office sends data to the central control room after receiving the communication request from the central control room. Commissioning situation and analysis In the implementation of the plan, in order to save investment, one of the two new drug injection points is proportionally added, because the two sets of water purification facilities are the same, thus saving a set of sensors and detectors Such equipment saves investment and achieves the same effect.
The following process requirements are proposed for the modified system: the water purification facility dosing point cannot be set on the first-stage pump suction pipe. Otherwise, the gravity pump or the pump suction will make the metering pump quantitatively out of alignment, and the pipe mixer should be added. A safety valve must be installed at the outlet of the metering pump after pumping. Otherwise, if the metering pump is inadvertently closed when the metering pump is working, the internal pressure of the high-pressure squib metering pump may be damaged or the motor may be burnt. The debugging is mainly done around the size of the set value. The value of the value reflects the working condition of the coagulation treatment. The process of the value from the negative value of zero positive value directly reflects the condition that the raw water colloid is not destabilized, destabilized, completely destabilized or excessively coagulated. Practice has proved that in the whole process, in order to obtain the best dosage, the given value is not a fixed value, it is affected by the parameters such as the raw water turbidity flow temperature value, and the set value is also used when different coagulants are used. Different. Through the commissioning operation of the water plant for more than one year, we have obtained the values ​​of the set values ​​under various conditions. For example, the same coagulant, under the same conditions, the winter setting is higher than the summer. When different coagulants are used, the set values ​​are different, for example, when using aluminum sulfate or trichlorochloride. When the iron is set, when the polymer is used as the coagulant, the set value is when the original water turbidity suddenly rises several hundred times than usual, and the value only needs to be increased by about 10 times in normal times to quickly stabilize the water quality. When the water quality flow and other factors change within a small range, the value can also reflect the change.
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