Zpravodaj Hnědé uhlí 2012, 52(4)
Mechanical slag dewatering method at Mělník power plant - part 2
- Výzkumný ústav pro hnědé uhlí a.s., Most
The paper describes the method of mechanical slag dewatering, where the process water circulates in a closed circuit. This method was implemented at the Mělník power plant by ČEZ Energetické produkty, s.r.o., according to a documentation developed by these companies: Výzkumný ústav pro hnědé uhlí a.s., CAB minerals, spol. s r.o., and SUMO, s.r.o. It is a unique slag dewatering system with a subsequent re-use of process water. The slag is dewatered with the use of a vibratory screen separator and a hydrocyclone. Water that conveys the slag from boiler to pump stations is refined and returned to the process. The refining process has several stages. The first stage is represented by hydrocyclones, the last stage is flocculation including dosing station and sedimentation basins. The development of the documentation as well as the construction works were conducted under time pressure. Some parts of the slag dewatering system were designed even after the construction works were launched. The construction works were performed in two stages. The first stage included construction of the building where the slag dewatering technology is installed and the first slag conveyor from the boilers. The second stage included construction of the second conveyor, performance test, and guarantee test of the whole system.
Keywords: slag, hydro-mixture, mechanical slag dewatering, flocculation, dewatering screen separator, tank
Published: December 1, 2012 Show citation