Multi-Coal Fired Boiler Optimum Control uses a proprietary algorithm from Mitsubishi Power. It monitors the characteristics of coal and the status of combustion in the boiler based on the heat balance of each heating surface of the boiler to support optimum control. This function runs on an operator station (OPS) from DIASYS Netmation.
Multi-Coal Fired Boiler Optimum Control offers the following functions.
Item | Brief description | |
---|---|---|
Characteristics change by coal type (heat absorption characteristics, generated heat) |
Estimation of the heat absorption distribution (heat absorption index) |
If the heat absorbed by each heating surface is estimated, the control parameters can be adjusted for the heat absorbed by the boiler. Consequently, compared to the case where the control parameters are switched based on a coal type group, more precise control parameters can be fed. |
Adjustment for generated heat | If the heat absorbed by each heating surface is estimated, the heat input from the coal and air and the heat output to the gas at the boiler exit can be calculated online. Based on the heat input and output, the generated heat can be estimated, and the fuel parameters can be adjusted in a precise manner. | |
Estimation of the moisture content of the coal | The moisture content of the coal can be estimated from the heat balance in the mill. Using this estimation along with the mill current and roller lift, you can get the characteristics of the columnar coal and automatically set the parameters related to the mill, such as the mill exit temperature, the rotation speed of the mill rotating classifier, and the oil pressure of the mill pressure device. | |
Estimation of the mill load ratio | By using model calculations based on a mill model, the hard grove index (HGI) can be estimated. By using this estimation along with the estimate of the moisture content of the coal, you can adjust the reference capacity of the mill, and you can estimate the mill load ratio from the actual amount of supplied coal. | |
Boiler characteristics change over time | Estimation of the cleanness of the heating surfaces | If the heat absorbed by each heating surface is estimated, the thermal conductivity can be calculated online. As the combustion in the boiler continues, the thermal conductivity decreases. Optimum timing of activating soot blowers should be based on time and also on the thermal conductivity as a good indicator. |
(Note) RH spray water flow meter, primary RH entrance steam flow meter, and denitrification entrance gas temperature sensor
The specifications of the hardware necessary for Multi-Coal Fired Boiler Optimum Control are as follows.
Item | Specification | |
---|---|---|
Model | DIASYS Netmation(duplexed CPU, single PIO system) | |
Structure | IP-33(dust-proof, water-proof) | |
Conditions | 0 - 54 deg C / 90%RH or less | |
Num of boards/Dimensions | 1board / 800mm(W) x 800mm(D) x 2300mm(H) | |
Insulation resistance | 500VDC / 5MΩ or greater Power supply-FG or I/O modules-FG |
|
Withstand voltage |
Power supply-FG | 2000VAC/1minute |
Digital I/O terminal-FG | 1500VAC/1minute | |
Analog I/O terminal-FG | 500VAC/1minute | |
Coating | External,internal,channel base : Munsell 5Y7/1(half gloss) | |
Other feature | Dedicated maintenance tool and gateway device (to interface with systems other than DIASYS Netmation) |
The specifications of the software necessary for Multi-Coal Fired Boiler Optimum Control are as follows.
Item | Variable-pressure once-through boiler |
Constant-pressure once-through boiler |
Drum boiler |
---|---|---|---|
Description lunguage | Interpreter DDC Oriented Language(IDOL) | ||
Operating speed | 100msec | ||
Number of control roops | Depends on the mounted features and existing system. | ||
Absorbed heat quantity index | Available(load change test with at least 3 coal types is required) | Not available | |
Heating value adjustment | Availbale | Not available | |
Heating surface fouling | Detected | ||
Moisture percentage in coal | Detected(estimated for each mill) | ||
Mill load factor | Detected(estimated for each mill) |
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