Reconstruction of the CHP plant with the conversion of boiler unit No. 9 to burn non-project fuel (gas group coal)

Equipment used, specifics of works provided

According to the project, the following was implemented:

1. installation of cold air pipelines from the BF to the mill inlet, equipping the hot and cold air pipelines with control valves to ensure that the temperature behind the mill is maintained at about 70°C in a wide range of fuel quality and load limits;
2. supplying the transport air ramp with a pipeline of low-heated air taken after the first stage of the air heater with a control gate to ensure that dust is supplied to the burners both during operation and during MB shutdown, and the temperature of the air mixture in front of the burners is no more than 170°C, no more than 150°C in the case of a filled dust duct;
3. replacement of dust ducts from dust feeders to burners with a smaller diameter to ensure the air mixture velocity in the dust ducts exceeds 25 m/s;
4. replacement of burners.

Based on the software and hardware complex OVATION Emerson software and hardware complex, an automated control system was implemented:

1. dust preparation;
2. dust feeding;
3. boiler load regulator.

To control the signs of violations of the normal operating mode, the dust system is equipped with control points for technological parameters:

1. exceeding the maximum permissible temperature at any point of the dust system;
2. exceeding the permissible temperature at the burner inlet (for example, due to malfunctioning of dust feeders, smoldering in mixers, clogged dust ducts, etc;)
3. overloading of the mill;
4. increase of pressure in the dust system to the design pressure of operation of explosive safety valves.