Overview of Sootblowing Programmable Control System
During the operation of industrial boilers used in many electric power, petroleum, and chemical companies, many parts such as boiler water walls, superheaters, economizers, air preheater tubes, etc. will accumulate ash, which will not only affect the tube walls The heat transfer effect, in severe cases, will also form coking, affect its service life, and even cause its damage. Therefore, large boilers are equipped with soot blowers to regularly clean the ash and slagging on the heating surface. The automatic program control system of the soot blower takes PLC as the core control unit to control each soot blowing equipment according to the on-site process requirements, and the touch screen (or the upper computer display) monitors the status of each equipment, and is equipped with a remote communication interface to realize the real automatic control.
Sootblowing program control system can improve boiler efficiency, extend the maintenance cycle, save energy consumption, expand the adaptability and availability of coal. Reducing the labor intensity of workers, improving the working environment of operators, and ensuring the safe and economic operation of boilers have obvious effects. The control cabinet can also adopt explosion-proof positive pressure structure to ensure the safe and reliable operation of the control system in the field of combustible gas in the petrochemical industry.

Composition of soot blowing program control system
The soot blowing system is mainly composed of operator interface unit (display operation screen or industrial control computer), soot blowing equipment interface unit (main control cabinet), power drive unit (power cabinet) and local equipment (long blowing, short blowing, air blowing heater and electric valve, etc.).
The display operation panel is composed of control panel, indicator light, button, changeover switch, etc., and is installed in the centralized control room. The operator can operate the soot blower and observe the operation of the soot blower. If the upper computer mode is adopted, the operator interface unit is the Yanhua industrial control computer, which is connected with the control cabinet through the control cable, and each operation interface is displayed on the liquid crystal display, and the operator can use the mouse for various operations. The control cabinet is responsible for collecting field signals, receiving instructions from the operator interface unit and coordinating and managing the operation of the soot blowing system together to realize the electrical control of each actuator. The power cabinet is directly controlled by the control cabinet to drive various soot blowers and various electric valves.

Function of soot blowing program control system

Group Control
The sootblowers are controlled in groups according to the layout of the on-site sootblowers and the power load of the control circuit. Each group is divided into boiler furnace soot blower control subsystem, superheater, reheater and economizer soot blower control subsystem, rotary air preheater soot blower control subsystem, soot blower steam pipeline inlet valve and trap control subsystem, etc. (specific subsystem arrangement can be set according to the actual equipment needs of users). Each group has a power supply and control power supply, which are locked on hard wiring and software to prevent overload of switches and lines.

Soot blowing control
According to the needs of different situations, the soot blowing control mode can adopt various modes such as automatic sequence control, remote manual, local manual, local non-steam soot blowing, etc. All electric doors at the soot blowing steam pipe are subject to program control, and remote operation can be realized on the program control panel or on-site manual operation can be carried out.
The on-site non-steam soot blowing method can only be used for commissioning and commissioning of the soot blower during overhaul under the condition of boiler shutdown to prevent dry blowing from burning out the equipment.
The remote manual sootblower can select an input in any order, and can accept interlocking and artificial interrupt signals.
The automatic sequence control is in numerical order by default, but it can also be in any combination order by group. The sequence control can also run automatically according to the set interval time period, and can also accept interlocking and artificial interruption signals. Pressing the emergency exit button during the sequence control process will make the running soot blower exit in advance, and end the sequence control mode and be in the ready state.
When set to local mode, soot blowing can be controlled manually on site.

Interlocking protection
It has various interlocking protection functions to ensure the safe and stable operation of the system. Soot blowing medium pressure protection, operating power loss protection, soot blowing motor overload and short circuit protection, soot blower forward and backward overtime protection, manual and automatic interlock, medium pressure low prohibit operation interlock, forward overtime and emergency backward interlock, accident automatic trip, all kinds of faults have sound and light alarm signals, and according to the fault type automatically take corresponding protection measures.

Operation interface
The upper computer adopts Yanhua industrial control computer and is equipped with configuration control software. The selectable operation interfaces include: control panel, operation execution panel, pressure and temperature graph, alarm display chart, sequence control selection picture, smoke temperature detector control picture, etc. The image dynamically displays the arrangement and status of various valves, pipelines and soot blowing pipes, displays the running time, soot blowing pressure value, system status indicator light, etc. When the system gives an alarm, the alarm screen will pop up automatically, display the alarm content, record the alarm, and record the operation and fault information of the last 30 days on the alarm list.