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How to improve waste heat power generation in cement kiln?
1. Long-term stable operation of cement kiln system is the basis of waste heat power generation in cement kiln. If the sintering process is unstable and the equipment operation rate is low, it will cause frequent grid connection and disconnection of steam turbine generator sets, which will seriously affect the power generation efficiency and safe operation of the units. Therefore, the cement kiln technology has been strengthened and improved from the aspects of raw fuel inspection, raw material ratio, firing control and equipment maintenance to meet the operation requirements of power generation system.

Second, the cement kiln waste heat power generation, from the kiln system to the power generation system, uses waste gas as the medium to transfer heat energy, and the quality of its waste gas parameters plays a decisive role in the waste heat power generation capacity, and the quality of waste gas is adjusted by the central control operation in the kiln; When the kiln system is abnormal, the central control operation is mainly to stabilize the cement kiln process. At this time, the parameters of exhaust gas are adjusted relatively frequently, the parameters of exhaust gas fluctuate greatly, the quality of exhaust gas is poor, and the power generation is unstable and low. When the kiln system is normal and stable, the parameters of waste gas are relatively stable, the quality of waste gas is good, and the power generation is stable and high. Therefore, to improve the power generation capacity of power station, cement kiln is the foundation, and mutual cooperation is the key.

3. In order to solve the problems of dust, algae and scaling in the condenser tube, rubber balls should be used to clean the scale every day. After rubber ball cleaning, the dirt is removed, the thermal resistance is reduced, the vacuum degree of steam turbine is increased from-0.086MPa before cleaning to-0.094MPa after cleaning, and the power generation is increased from 4000kW before cleaning to 4350kW after cleaning, which is very obvious.

Fourthly, the control of main steam parameters should focus on stabilizing and increasing superheat, supplemented by stabilizing and increasing pressure, increasing the enthalpy of steam, reducing steam consumption rate and improving power generation capacity.

Fifth, connecting pipes are added to the high and medium temperature flue, which facilitates the adjustment of high temperature air and medium temperature air, thus improving and stabilizing the inlet temperature of AQC boiler; Replacing the original castable with wear-resistant ceramic coating reduces the thickness of castable and increases the effective ventilation area of high temperature flue, thus improving the power generation capacity.

6. Aiming at the problem of frequent ash accumulation in ash superheater, steam soot blower is installed to clean the superheater tube bundle regularly, which ensures the smooth and normal heat exchange of superheater and improves the power generation capacity of waste heat.

Seven, boiler chemical water treatment using reverse osmosis water production process, reduce the heat loss caused by boiler sewage, improve the waste heat power generation capacity.

Eight, cement kiln waste heat power generation technology includes cement kiln firing control technology, thermal cycle principle, boiler thermal technology, steam turbine working principle, automatic control technology, excitation power generation technology, water treatment technology and other multidisciplinary theories. Therefore, it is necessary to seriously study and practice these foundations and flexibly apply them to the power generation process of steam turbines to ensure the safe, stable and efficient operation of the units and improve the capacity of waste heat power generation.