Electrical Energy Management in the Cement Industry
A cement plant uses about 150 kWh of electrical energy per metric ton of cement produced. Where is this electrical energy being used? How is it being used? Can it be utilized more effectively? If so, how? What can be done to conserve the electrical energy used in an existing cement plant and in future cement plants? An electrical energy management program to resolve these questions is presented. Included is an electrical energy consumption survey of five cement plants. Department consumption is tabulated, and suggestions are made to conserve electrical energy and reduce cost of electrical power in both new and existing plants.
Trends in kiln drives
The heart of the cement plant is the rotary kiln, and continuous quality production of cement clinker depends on the continuous accurate performance of the rotary kiln drive.
Techno-economic analysis of chemical looping combustion with humid air turbine power cycle
Abstract Power generation from fossil fuel-fired power plant is the largest single source of CO2 emission. CO2 emission contributes to climate change. On the other hand, renewable energy is hindered by complex constraints in dealing with large scale application and high price. Power generation from fossil fuels with CO2 capture is therefore necessary to meet the increasing energy demand, and reduce the emission of CO2. This paper presents a process simulation and economic analysis of the chemical looping combustion (CLC) integrated with humid air turbine (HAT) cycle for natural gas-fired power plant with CO2 capture. The study shows that the CLC–HAT including CO2 capture has a thermal efficiency of 57% at oxidizing temperature of 1200 °C and reducer inlet temperature of 530 °C. The economic evaluation shows that the 50 MWth plant with a projected lifetime of 30 years will have a payback period of 7 years and 6 years for conventional HAT and CLC–HAT cycles respectively. The analysis indicates that CLC–HAT process has a high potential to be commercialised.