PLC application in the coal-fired thermal oil boiler transformation

PLC application in rebuilding the heat conduction oil boiler van dyke trade ( Shanghai) Co. , LTD. Welcome to visit e hall hall 4 heating machine/exhibition hall electric box furnace, heating furnace heat conduction oil furnace, high temperature box, high-frequency heating machine, induction heating machine,. 。 。 One, the introduction this paper, taking jiangyin xiangshan printing and dyeing coal-fired thermal oil boiler as the object, the modification of control system, PID control function of PLC controller to control frequency converter, instead of the original in the fan and induced draft fan system through frequent start-stop way to control the oil temperature, to achieve the reduction in the number of output points and relay accurate temperature control, the effect of coal saving. At the same time, through the touch screen can be interactive advantage, realize the freedom of temperature setting and moderate oil furnace negative pressure real-time monitoring. Second, the system introduced this system is a coal-fired boiler, need heating medium is heat conduction oil, oil boiler 6 oil motor, transmission of the oil pump and motor and slag remain in operation, power frequency to variable frequency control of motor has three: induced draft fan, air blower, sent to the boiler coal of coal machine. Two analog signals need to detect, is pressure testing, all the way along the way is out of the oil temperature detection. Three, technological requirements: induced draft fan equipment the boot sequence is first started, then start the blower, finally to start the fire grate. Shutdown sequence is to stop blower first, and then stop the induced draft fan, the last stop grate. Circulation pump is running, can not stop, sent to scuttle start stop of the motor and the slag of coal is controlled by manual. Main control furnace temperature blower, indirectly control the oil temperature, the impact pressure in the furnace, induced draft fan is mainly control the furnace pressure, affect furnace temperature, indirect effect thermal oil temperature. System requirements out of the oil temperature in a 270 - degree, error of plus or minus five degrees. Keep the pressure in the furnace is in - 10Pa. Four, system hardware configuration, the system of the PLC host is the FBs - in the company 20 ma a, FBs - analog input module 2 da a, FBs - analog template B2A1D one, PC's touch screen, frequency converter of the three. PLC I/O points and register configuration of five: the design of the software: 5. 1 options: boiler system is a system to maintain constant temperature and constant pressure, due to the pressure and temperature between the various elements have influence, so in the early stage of system design to develop a variety of solutions. Boiler scheme of the original system is controlled by temperature control table of induced draft fan and blower motor start-stop, frequent start-stop motor of electric energy waste is extremely serious, through analysis, using inverter control motor instead of relay control, the features of the PID control through PLC controller temperature and pressure. Solution a: single PID control scheme, through the temperature signals were collected by PID arithmetic, control the frequency of the blower, again through the frequency control the frequency of the induced draft fan blower, the corresponding relationship between them is to keep furnace pressure for - 10Pa。 Scheme 2: double PID control scheme, through the temperature signals were collected after the PID arithmetic, control the frequency of the blower. Collected through the pressure signal is again after the PID arithmetic, control the frequency of the induced draft fan. Make two stable frequency values in equilibrium state and to keep furnace temperature of 270 degrees at the same time, the pressure is maintained in - 10Pa。 Through debugging scheme 1 and 2, according to the results of one way of the result is not very ideal, temperature and pressure fluctuation is bigger, the effect of the scheme, is very good, two frequency values in a state of dynamic balance, temperature and pressure are to satisfy the control requirement. Six. Conclusion: the increasingly prominent energy tension and the increasing cost, coal boiler of power saving and section, more and more attention from the industry. Boiler combustion situation by drum, wind turbines and grate motor speed control, the transformation cost has been accepted by the user. So the automatic control system of boiler system reform is more and more widely used.
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