The heat exchange station mainly completes the exchange from a heating network to the two network two times the net heat hot water supply, the replacement of the final heat users, to reach the heating purpose. Heat exchange station monitoring system can carry out effective monitoring and control of heating process, and achieve energy saving heat heat balance of the whole network, the specific control functions are as follows:
1) exchange station monitoring data: 4 road 4 road temperature, pressure, liquid level, valve position, flow, heat and other data monitoring.
2) temperature control
3) pressure supply control
4) climate compensation regulation
5) time-sharing control
6) zoning control
7) temperature limit
8) temperature limit
9) flow limit
10) caloric restriction
11) hand automatic switching
12) remote and local control switching
13) running status monitoring
14) safety control
15) alarm control
16) fault handling control
17) site management monitoring
Control subsystem of heat exchanger unit
Process flow diagram:
Control strategy:
1) apply programmable logic controller (PLC) to carry out closed-loop regulation (PID) on demand, and realize the quality regulation and quantity adjustment of the two network side heating.
2) live HMI: touch screen or hand reader.
3) temperature control: climate compensation and constant temperature water supply function.
4) pressure control: two sides constant pressure water supply, two side constant pressure replenishment.
5) chain control: automatic pressure relief chain, boot self-test function, sequence start and pump valve interlock, voltage loss protection, power off protection, over temperature protection, overpressure protection, water tank replenishment, time control procedures.
6) alarm control
7) fault control
8) running data display and storage
9) communication control
