European Technical Approval dor mixed coal ash: A Portuguese experience

Abstract

When Sines power station started its operation, boilers were equipped with a wet bottom ash removal system. In a system like this, ash is collected in a water-filled hopper at the bottom of the furnace. When a sufficient amount of bottom ash drops into the hopper, it is removed by means of high-pressure water jets and conveyed by sluiceways either to a disposal pond or to a decant basin for dewatering and then transported for disposal. The operation of this system revealed some disadvantages: • Water consumption • Effluent treatment • Handling of ash and disposal management • Power Consumption. For several times it was evaluated the replacement of the wet ashtray with a dry type, but this option seemed to be too expensive.