745-W3-P5-G5-HI-ALR Spare parts industry

1. 8 sets of temperature control zones.
2. 10 sets of temperature display areas.
3. Thermocouples: 18 pieces. Among them: 11 K divisions and 7 S divisions
4. Fan selection
Smoke exhaust fan: 15kw, one on and one standby, star delta start is required.
Combustion fan: 15kw, one on and one standby, star delta start required.
Emergency cooling fan: 11kw, one on and one backup (variable frequency)
Heating fan: 15kw, one on and one standby, star delta start is required.
Quick cooling fan: 7.5kw, one on and one standby, directly start.
Axial flow fan: 0.18kw, 8 units directly started
5. Safety chain.
Switching interlock: It must be a hardware interlock and a software interlock. Further implement process interlocking requirements during design.
6. Using human-machine interface control
Set up a human-machine interface on site, and all operations can be completed on the human-machine interface; The panel buttons and human-machine interface buttons are backup to each other. (Centralized and decentralized control)
7. Control information can be transmitted to the computer, which is only used for information management and does not participate in control.
The computer screen should include: on-site simulation diagram, real-time temperature curve diagram, and control settings
Graph, historical trend graph, and complete report printing function.

 745-W3-P5-G5-HI-ALR Spare parts industry

systems analysis
1) Temperature collection section
10 thermocouples with K and S graduation numbers.
2) Temperature control section
Among the 18 o’clock temperatures, 8 o’clock (to be specified during design) is used for temperature control.
Among these 8 temperature control points, 7 are used to control the valve position value of the actuator, change the fuel injection amount, and stabilize the temperature. Another point is to control the output frequency of the quenching frequency converter, change the operating speed of the quenching fan, and adjust the temperature of the quenching zone. Other factors are manually adjusted (such as combustion air, gas pressure, etc.).
Each temperature control point occupies one analog output, while the quenching frequency converter occupies one analog output
Output, actuator adopts open positioning method.
Therefore, temperature control occupies:
8 analog signals (input, output).
3) Related fan section
a、 Smoke exhaust fan control
The smoke exhaust fan has one in use and one backup, and the two are logically interlocked. The electrical control adopts two independent sets of star delta control, each set occupying three switch output points (main, star, triangle) and three switch input points (start, stop, fault). Therefore, the smoke exhaust fan control occupies:
6-point switch input: (start, stop, fault) * 2.
6-point switch output: (main, star, triangle) * 2.
b、 Combustion fan control
The combustion fan has one in use and one backup, and the two are logically interlocked. The electrical control adopts two independent sets of star delta control, each set occupying three switch output points (main, star, triangle) and three switch input points (start, stop, fault). Therefore, the control of the smoke exhaust fan occupies:
6-point switch input: (start, stop, fault) * 2.
6-point switch output: (main, star, triangle) * 2.
c、 Emergency cooling fan control
The speed of the emergency cooling fan is adjusted by the frequency converter, and the output frequency of the frequency converter is controlled by the internal PID operation of the PLC to output a 4-20mA standard signal. At the same time, manual automatic switching can also be implemented for control on the human-machine interface. Therefore, the emergency cooling fan occupies:
5-point switch input: Quenching A start, Quenching B start, Quenching stop, Quenching A fault, Quenching B fault
2-point switch output: (operation control) * 2.
1-point analog output: frequency adjustment (manual automatic adjustment).

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