哈尔滨绍和水厂自控系统改造及运行效果分析环境工程专业论文.docxVIP

哈尔滨工业大学工程硕士学位论文 哈尔滨工业大学工程硕士学位论文 - - II - Abstract Control method before, which includes only the flow of water. That project controls the blunt distance of metering pump according to the source water current quantity and muddy degrees, controls the frequency of metering pump according to the deviation of the initial values and feedback current of the streaming current monitor. That project combines to take the amount of water current and take the water interference of the muddy degree to move the variety, then the hurl adds the interference of the quantity to move the variety, combining at the same time inclined take care of a deviation, have the accuracy of control high, stabilize the quick characteristics of speed, solved the antinomy of the stability and the control accuracy to some extent. Can also overcome the on line instrument diagraph is not a settled weakness. The second is added the chlorine to design the feedback to the water factory filter string class of control project, should control the project to add the chlorine standard after can adjust the filter automatically, need not the artificial intervention, lower the influence of the artificial error margin, carry out the real automation. Frequency conversion technique is the key that the factory of water lowers the electricity to consume. Comprehensive analysis of this paper change the economy energy of frequency and change the frequency principle of the soft start circularly, and changed to press to change the quantity and constantly to press to change the quantity to carry on the research towards changing the economy energy of frequency two kinds of to carry out the way. The constant presses to change the quantity water supply method according to the variety of a factory water pressure dint, passing the controller ofμXL to regulate to change the machine of frequency，to use the factory water constant pressure to settle. Change to press to change to measure the way then according to the pressure of a fac