General Installation Procedure
High Impact Soot System
Below describes the measures necessary for implementation of High Impact Soot System (HISS), for optimization of steam soot blower and recovery boiler operation.
Step 1 – Install pneumatic actuator on the steam soot blowers
The installation takes approximately 10 – 15 min per blower and can be performed during boiler operation. The actuators can be bypassed with a blocking pin.
Figure 1. Five-step retro-fitting of HISS actuators on soot blowers during boiler operation (click to enlarge)
Step 2 – Install pneumatic control boxes for HISS
The actuators are operated with instrument air at ~6 bar and is distributed to the soot blowers, through pneumatic control boxes. Each control box can handle up to 12 soot blowers.
Figure 2. General flow chart showing the pneumatic control boxes and the connections to the soot blowers (click to enlarge)
Step 3 – Install ACABBM 800M controllers for the actuators
The contactors for the soot blowers are replaced with new ones, with direction control. Furthermore, an ACABBM 800M controller is installed. This make up the controls for the HISS-function.
Figure 3. Old (left) soot blower contactors and new pre-fabricated electrical mounting plate (right) with direction controllable contactors.
Step 4 – Implementation of operator control display
The soot blower control display in the DCS, is the most powerful tool for putting the power of HISS at the fingertips of the operators. The control display is custom made for each unique boiler and increases monitoring of individual soot blower operation and status.
Figure 4. Example of control display
Step 5 – Implement percentage soot blowing software (Soot Power Control)
The distribution of soot blowing capacity is done by changing the percentage per soot blower. The software automatically re-calculate the number of starts to even interval. Thanks to the HISS technology the number of start have increased with 100%, while giving the operator an excellent overview of the present soot blowing program. The operators are now able to quickly redistribute soot blowing to different parts of the boiler, depending on present conditions.
Figure 5. Soot Power Control for two different cases normal (left) and power (right)