Online monitoring and control of boiler air powder

 1、 Introduction to Boiler Air Powder Online Monitoring and Control System:

The boiler air powder online monitoring and control system is developed by the Boiler Combustion Monitoring Technology Research Institute of Xi'an Thermal Power Research Institute. The boiler air powder online monitoring and control system consists of three parts: online monitoring of primary wind speed, online monitoring of coal powder concentration in the primary air duct, and online monitoring of secondary and tertiary wind speeds. Its main function is to guide the boiler to reasonably distribute air and coal, prevent the occurrence of air and powder cuts or pipe blockages, optimize combustion of the boiler, and operate under optimal conditions.

At present, the system has been widely used in more than 300 medium storage hot air powder feeding, exhaust gas powder feeding boilers, and direct blowing boilers in multiple power plants across the country. The system is designed to operate stably, with reliable measuring components, accurate signal processing, intuitive and practical graphics, and can guide combustion, adjust air and powder evenly and reasonably, with significant energy-saving effects. The technology has reached the international advanced level.

It has high practical value and can be promoted and applied in intermediate storage type hot air powder feeding boilers, exhaust gas powder feeding boilers, and direct blowing boilers. The installation and operation of the boiler air powder online monitoring system in the power plant has completely changed the habitual operation mode of the boiler operator, providing conditions and basis for operators to monitor the air powder situation of each burner and make timely and effective combustion optimization adjustments. Its energy-saving effect is significant and it is very popular among operators. Awarded the National New Product Certificate by the National Science and Technology Commission, and the technical support unit for this product by five ministries including the National Science and Technology Commission.

We have collaborated with companies such as MAX, FOXBORO, SIEMENS, Xinhua, and Hollysys to successfully develop a boiler combustion monitoring and control system on DCS, which can achieve closed-loop control of boiler burner balanced output and optimized combustion.

2、 The function of the online monitoring and control system for wind powder:

1. Improve the safety of boiler operation:

The online monitoring system for wind and powder provides a reliable means for boiler operators to monitor the wind and powder situation of each burner and adjust combustion in a timely manner through real-time online monitoring, intuitively displaying important parameters such as primary wind speed and coal powder concentration. This enables some previously difficult to detect problems to be discovered and provides the possibility for organizing combustion in the furnace reasonably. The online monitoring system for wind and powder can timely and accurately monitor the operation of the boiler, effectively preventing incidents such as air duct blockage, powder breakage, and flame center deviation, and reducing the occurrence of accidents such as fuel injection and boiler fire extinguishing.

2. Can improve the economic efficiency of boiler operation:

Through the online monitoring system of wind and powder, it helps to ensure the balance of boiler wind speed and concentration, stable oxygen content near each burner, good combustion power field in the furnace, and stable combustion; Effectively reducing combustible materials in boiler fly ash, improving overall boiler efficiency, and saving fuel costs; At the same time, it saves the fuel cost required for stable combustion, avoids accident costs caused by burner burnout, and saves indirect losses caused by boiler recovery after extinguishing the fire. Conservatively estimated, the investment cost of the entire wind powder online monitoring system can be recovered within one year.

3. The social benefits of the online monitoring system for wind distribution:

Experimental results have shown that low oxygen levels near the burner can lead to an increase in CO1 emissions, while high oxygen levels can lead to an increase in NOx emissions. Therefore, by controlling the wind coal ratio reasonably, the CO1 and NOx emissions of the boiler can be reduced. Installing an online monitoring system for wind powder can effectively reduce the workload of operators.

3、 The system has the following characteristics:

1. Adopting the new generation of anti-wear and anti blocking speed measuring element FS-5C, it can achieve continuous measurement of airflow velocity with powder without the need for compressed air blowing.

2. The RY-5C temperature probe, which is highly wear-resistant and has good heat transfer performance, is used to ensure that the entire system responds sensitively and has a low failure rate. Its wear-resistant life can reach more than 10 years.

3. Select different measurement methods and establish different mathematical models based on different powder production systems to ensure measurement accuracy and system economy.

4、 System composition:

The boiler air powder online monitoring and control system consists of primary air and coal powder concentration monitoring, secondary and tertiary air speed monitoring, and boiler efficiency monitoring. Its hardware (as shown in the structural diagram) mainly consists of primary measuring components, transmitters, acquisition front-end, communication network, industrial computer system, and other parts. Due to the widespread application of DCS systems in power plants at present.

The online monitoring and control system for wind powder has been able to connect and communicate with different models of DCS at home and abroad, or directly develop software, control configuration, and graphic configuration on DCS. To meet the requirements of different users for combustion monitoring systems.

5、 The main functions of the online monitoring and control system for wind powder are:

1. Real time wind powder graph display

2. Wind simulation with circular cutting

3. Real time Wind Powder Trend Chart

4. Real time secondary and tertiary wind speed display [optional]

5. Balanced combustion closed-loop control

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